A special message for my friends –
So it’s time to consider Extension Cords for Portable Generators. If you already have a portable generator, make sure the extension cords you’re using are the right ones. Storms could happen ANY time… it’s the season.
PLEASE don’t be caught off-guard. With the types and number of storms we’ve been getting, you might be looking for a new generator, or hauling out the one you’ve been storing in the garage.
If you use a transfer switch, you normally only need the cord from your generator to the switch. If not, you don’t want to be caught off guard with an inadequate generator extension cord. Make sure that it is of sufficient gauge and length for your purposes.
Remember, you must keep the running generator AWAY from any living space. Don’t put your family in jeopardy because your cord is too short. ALWAYS be safe.
What Are the Differences?
Standard outdoor three prong 5-15 male and female ends
In this post, you will find out what you need to know about extension cords for portable generators. These are also referred to as generator cords.
Do you understand gauge wire sizes and how they relate to the length of cord? What’s the difference between a four prong extension cord and a three prong one? What does AWG mean? These are the most common question and you will find your answers within this article.
You probably have extension cords of different gauges and lengths lying around the house and in your garage. But are they suitable for use with your portable generator?
You know that for safety and the possibility of Carbon Monoxide poisoning, you have to operate your portable generator at least 20 feet from your home and never in a basement or garage. So if you’re using it for powering devices in your home, that means you’ll need long generator cords to run appliances in your home, right?
So why can’t any old cord do as long as the plug fits? Should you care how long the cord is? The answer is YES! First, we’ll have to look at how cords are rated. And then there are those plug configurations that we’ll need to understand. Above all, we’ll want to insure the safety of our families and ourselves. Ready?
If you feel the need to look at the wide variety of generator cords (and household types), there is no better location to search for just about any extension cord you could need than at Amazon.com.
Don’t expect that your local hardware or home improvement store will have a large enough selection. You can browse when you’re ready by clicking the Amazon button, and type in some of the descriptors that you’ll be reading below:
How Do Gauge and Length Correlate?
Extension cords contain copper wire through the center that varies in thickness. The thickness is rated by American Wire Gauge (AWG). Most common are AWG 16, AWG 14, AWG 12, AWG 10, and AWG 8, with the lower the number, the thicker the wire, or bundle of wire. The thicker the wire, the more watts (and amps) you can expect to power through it. For example, a thin standard cord for a wall lamp which you’ll have in your home, which doesn’t need much power is probably AWG18 wire with only a two pronged plug.
But you should know that depending on the Amp draw or wattage of your appliance, the gauge of the wire in your extension cords becomes a factor in the length of the cord you can use. Because a wire can cause resistance to the power flow and the thinner the wire, the more the resistance. Similarly, the longer the wire, the more the resistance.
In order for your electrical device to operate efficiently and safely, it must get the full power that it needs. You could even damage the device. If the resistance due to the cord thickness or length keeps the device from getting what it needs, you have to increase the thickness of the wire (lower number AWG), or shorten the cord. The lower the gauge AWG number (thicker the wire), the longer the cord you can use to supply power to identical devices. Take a look at the table below:
Wire Gauge Requirements
Device Requirements and Maximum Cord Length (ft) by Wire Gauge
Amps Watts (120V) Watts (240V) #8 wire #10 wire #12 wire #14 wire #16 wire
2.5 300 600 NR 1000 600 375 250
5
600 1200 NR 500 300 200 125
7.5 900 1800 NR 350 200 125 100
10 1200 2400 NR 250 150 100 50
15 1800 3600 NR 150 100 65 NR
20 2400 4800 175 125 75 50 NR
25 3000 6000 150 100 60 NR NR
30 3600 7200 125 65 NR NR NR
40 4800 9600 90 NR NR NR NR
Let’s say you are going to run an appliance with a 10 Amp draw on 120 Volts. That equates to 1200 watts if you remember the formula that Watts = Volts x Amps. If your extension cord is #16 gauge wire, you can have a cord up to 50 feet. For the same appliance, if your cord is #10 gauge, your maximum length is 250 feet. Now very few households have extension cords this long, but on-site work can often mean that the portable generator will be located 100’s of feet from the power need. And lower gauge extension cords are very expensive. You’ll have to decide what is best for your needs.
Guidelines for the Size of Generator Cords
National Electric Code (NEC) guidelines on amperage determine the gauge or wire that you want to use, and resistance determines the length. All wire has resistance which will lower your voltage over distance so if you have to go far then you need to step up your gauge.
Examples of Amperage limits are…
- 16g = 10 amps
- 14g = 15 amps
- 12g = 20 amps
- 10g = 30 amps
Always follow all safety guidelines when using extension cords and electrical cords in general. If you tried to use an extension cord with #16 AWG for an appliance which draws 15 amps, the cord may get very hot and create a fire hazard. Always look for the Underwriters Laboratory (UL) label which is permanently attached or molded into the cord. Read the label for instructions and electrical rating. A “W” on the plug will tell you that it is rated for outdoor use. See below for other letters which describe your cord.
Be safe. If you don’t have adequate extension cords for your portable generator, take the expense to purchase one. Safety does not come with a price tag. Get cords that will do the job safely. Most portable generators with dual 120V/240V power have a L14/30R receptacle. L14/30R and other outlet/plug designations are explained in more detail below.
Since they mostly supply a maximum 30Amps from the outlet, some have opted to step up to a 50Amp cord, but this can be pricey. The cord below is a safe choice for running several devices off of your L14/30R in most 120V/240V portable generators. This type can be rated for 300V, so as long as you don’t attach more than 30 Amps total, you’re good. The cord pictured is made by Westinghouse and is available at Amazon among other places.
Westinghouse 25 ft 10 gauge with L14-30 plug and four 5-15R receptacles, rated for 300v
You will come across several extension cord types when you shop around. Typically a standard three prong (5-20A) male will have a standard three prong female at the other end.
NEVER use a male to male cord. These are highly dangerous and might even be illegal. Imagine plugging into your home outlet. This is an exposed LIVE end. Imagine accidental contact with this live end. Worse yet, imagine a small child putting the live end in his or her mouth. NEVER!
You would need this type of cord to connect directly into a wall outlet from your generator. Remember you should not connect your generator to your home through a wall outlet. This is highly dangerous as it could back-feed a power line that an electrical worker assumes is down. Never buy one. Never construct one. Always be safe.
Be aware if you use a split ended cord, that even though you can plug in more devices at the end of the cord, the same maximum amps are available through the main cord and the multiple female receptacles will share the power. You must remember to not overload.
PowerFit 25 ft 30 Amp with L14-30 plug and four 5-15R receptacles with two in-line breakers
Use the heavier three or four prong locking cords when you plan to split the work at the other end. Some cords have added safety by including in-line breakers.
Normal extension cord safety should be mentioned. You know the drill. Never use damaged or frayed cords or risk electrocution or fire. Never place rugs, carpet or any item on top of an extension cord. Never plug a generator into your home via a wall outlet. For other general safety ideas, check out the article on this site How to Safely Use a Portable Generator.
Portable Generator Outlet Types
NEMA is the acronym for the National Electrical Manufacturers Association. NEMA connectors are AC power plugs used for electrical outlets in North America and other countries that use the standards set by the US. The NEMA 5–15R is the standard electricity outlet found in almost every household and building in the United States.
NEMA wiring devices are made in current ratings from 15 to 60 amperes, and voltage ratings from 125 to 600 volts. Different combinations of contact blade widths, shapes, orientation, and dimensions give non-interchangeable connectors that are unique to a particular voltage, current capacity, and grounding system. NEMA 1 (two prong) and NEMA 5 (three prong) are what we’re used to seeing around the house.
There are two basic classifications for a NEMA device: straight-blade and locking. The straight-blade 5–15 and 5–20 are found nearly everywhere in countries using the NEMA standards, and are intended for supplying lighter-duty, general-purpose electrical devices.
Twist-locking types are used for heavy industrial and commercial equipment, where increased protection against accidental disconnection is required. An example of this is in hooking to your homes panel with a transfer switch. See the article on transfer switches on this site. Numbers prefixed by “L” are curved-blade, twist-locking connectors; others are straight blade and non-locking.
The numeral preceding the hyphen in NEMA nomenclature indicates the configuration, that is, the number of poles, number of wires, voltage, and whether single- or three-phase. A grounding type of device is described as two-pole, three-wire; or four-pole, five-wire; etc. A non-grounding device may be two-pole, two-wire; or three-pole, three-wire; etc. Make sense?
The numeral following the hyphen is the rating of the device in amperes. The number is followed by the letter R to indicate a receptacle (female connector) or the letter P to indicate a plug (male connector).
As an example, the 5-15R is the common 125 V two-pole, three-wire receptacle. The L5–15R, while sharing the same electrical rating, is a locking design that won’t fit with the straight-blade 5–15 design. The 5–30 has the same two-pole, three-wire configuration and 125 V rating, but is rated 30 A. Notice that 125V is commonly mentioned here, but 120V is the common current that can fluctuate upward and downward when supplied by a portable generator.
Although there are several non-grounding device types in the NEMA standards, only three of them are in widespread use today due to safety issues. These are the two-pole 1-15, still in use in millions of buildings built before the 1960s, and the three-pole 10–30 and 10–50. You can use the 1-15 in a 5-15R or 5-20R.
When shopping for portable generators, the predominant outlets are the 5-20R and the L5-20R or L14-30R. You will find some with RV receptacles and numerous with a DC receptacle for 12volt charging. Remember to match the receptacle on your generator with the plug of the extension cord. Never use a cord that was not intended for its purpose.
Champion model 46539
Duromax model xp4400e
Notice on the left on the Champion model, and on the right the Duromax model have the standard three prong 5-20R outlets. But the larger outlets are different.
On the Champion you’ll find a common three prong locking 120 volt L5-30R and the three prong 120 volt TT-30R. The TT (travel trailer) is common on RV’s. On the Duromax model you see the four prong 120/240 volt locking L14-30R.
DC plugs can be more difficult to find, depending on the receptacle type on your generator. Some have two prong offset plugs, some have a cigarette lighter plug type, some simple positive and negative end wires. Hopefully, if you purchase a generator with DC capability, the unit will come with a DC cord included.
Extension cord information can be confusing the first time through, as it was for me. Take your time on this. Make the right choice for your generator for the uses that you plan for it. Most importantly, make sure that you have the right gauge for what you plant to run, AND sufficient length. You’ll want at least 25 feet, but can’t go wrong with 75 feet to 100 feet as long as the gauge is 10awg. You’ll find many uses for your cord that you may not have expected.
Generator Cord Varieties
OK, here is the nomenclature that most don’t need to know, but the Generator Grader prides itself in providing all of the education that you could use. You may come across a series of letters describing your generator cord like SJ, SJT, SEOW, SO and others. Each has an application and materials associated with it.
The cord could be made of thermoset, thermoplastic elastomer, or thermoplastic. Thermoset cords have heavy-duty rubber jackets and are very sturdy. Thermoplastic elastomer cords are medium-duty and work well in cold environments. Thermoplastic cords are light-duty.
Here are what the letters mean. The nomenclature may be any combination and will determine its best use:
- S = Severe Service Cord – 600 volts
- SJ = Junior Severe Service – 300 volts
- T = Thermoplastic
- H = Heat Resistant
- N = Nylon Outer Jacket Material
- E = Elastomer – thermoplastic that looks and feels like rubber
- O = Oil Resistant Outer Jacket
- OO = Oil Resistant Outer Jacket and Oil Resistant Insulation
- V = Vacuum (typically for vacuum cleaners)
- W = CSA Weather and Water Resistant (for indoor and outdoor use)
Well, that’s about it. Check out hundreds of styles and lengths available. Happy browsing. While you’re at it, you might want to check out the 5 gallon gas containers, funnels, fuel stabilizer and generator covers to have everything you’ll eventually need.
Filed under: Understanding Cords & Outlets
Hello, I am a newbie to all this, but trying to be proactive as I know have a new addition to the family. Just finished purchasing a champion 3000 watt portable generator which can push upto 30 amps. I went to lowes & the rep told me a 12gauge indoor/outdoor would work fine for me. Just wanted to get your input. Thank you.
Hi Michael,
Congratulations on your new addition. In answer to your question regarding the gauge of your cord, yes a 12 gauge will work for most situations. Much will depend on how much of the 30 amp capacity of your generator you’ll be using at the same time. If you plan to use ALL 30 amps at the same time, you will want to go to a 10 gauge (see the table on the article).
Is the 3000 watts the running watts or the surge watts. To get 30 amps out of a 3000 watt generator is unusual. There is a formula: watts = volts x amps. Assuming standard 120 volts, for 3000 watts, that’s only 25 amps.
Lets say you will only be running a 10 amp refrigerator. With a 12 gauge, you can probably safely use a 150 ft cord. If you were only running a 5 amp appliance, you could go up to 300 foot cord. Like many people, if you have a cord that splits into a few standard household three-prong outlets, you may run a few items at the same time. You’ll need to add up the amps of all the things running. let’s say that’s 20 amps total. Now were down to 75 feet maximum recommended for 12 gauge.
You said you were a newbie. I’m assuming you know that you are asking about the circular shaped outlet on your generator. The standard three prong outlets on your unit that look like a household plug won’t give you 30 amps. The smaller plugs only supply 15-20 amps each.
75 feet seems like a long cord, but remember, it is VITALLY IMPORTANT that you keep the running generator OUTSIDE and away from your home. The fumes can KILL. Never operate it in your garage, basement, or where the exhaust can enter a living area. Depending on the layout of your home, 75 feet may not be long enough. In that case you’ll want a 10 gauge cord which will allow you to run the same 20 amps on a 125ft cord (kind of pricey the lower gauge you go).
Assuming you are interested in using the generator in a power outage, here’s what I’d do. Determine how many amps you’ll be using at the SAME time. You can always alternate the appliance usage so not all at once. Once you have the total, let’s say 20 Amps, measure the maximum distance that the cord will have to be while the generator is a safe distance from your home. If over 75 feet, go with a lower gauge.
If you are using your generator for powering single tools or other home uses when you’ll be using the 20amp plugs of your generator, then 12 gauge is a good choice.
Remember, I’m just a regular guy who wants to help. I’m not an electrician or expert. If in doubt, consult with the maker of your generator. Good luck.
Ray
hi tried to email you but cant hope this gets through and you can help me//have a firman generator //bought a l5-30p plug for generator //10g wire as itsa 30a generator //can i just attach 15a or 20 a plugs to it //or is there something else i need// hope yoou can answer my question
Hi Mike,
I’m not familiar with your model, but if it has standard three prong wall type outlets, you can use 15A or 20A plugs to those. Those generator outlets are often marked with their Amp supply. A 30Amp plug on your generator will have a different plug for supplying the 30Amps that the generator is made for. Hope this helps.
Ray
hi ray iknow about the ones that look like a house plug 3 prong //the one iam trying to nmake a cord for is a 30amp 120v 3 prong plug that uses a 30a locking plug //it is a L530p// so it being a 30amp ill use 10g wire // can i add to the end that comes into the house 2 regular household plugs either 15 or 20amp//or does something extra have be done cause going from 30a to 15 or 20//the company makes a cord for mygenerator but it has circuit breakers on it thats why iam wondering do i need add circuit breakers going from 30a to 15 or 20a// app your help
Hi Mike,
You might consider a standard 30Amp cord with matching ends. There are inexpensive, short extension cords to fit the 30Amp and split into household plugs. All breakers in place. You might find this arrangement more versatile in the future with more options.
Otherwise breakers to insure that 30Amps won’t be delivered to your household plugs if your plugs don’t come with them.
Be safe,
Ray
I bought a 5500 portable AC unit, incase we have any hurricanes this summer… Have 6500 generator… Which extension cord do I need and how long should it be?
Hi Claudia,
The following assumes that the 5500 that you mention refers to BTU (the cooling capacity of the AC)
And the the generator that you have has a surge rating of 6500 watts.
If that is the case, then the generator will have plenty of power for the AC unit which probably runs on less than 9 amps, and plugs in to a standard household wall outlet 110v.
Any cord that has an amp rating of 20-30 amps will be sufficient. Almost any length will do. You may wish to have an outdoor rated cord. Assuming the generator will run outside. Make sure that the generator will be operated in a well ventilated area, away from any living area. The distance from the home plus the distance the cord will need inside the home should be considered.
That said, remember the disclaimer above regarding you specifications, 50 feet should suffice. Remember to match the ends of the cord to the outlet on the generator and the plug of the AC.
Good luck and stay safe.
Ray
I have a Duromax 8000 portable generator with a l14-30r. I would like to position my generator about 55 – 60 ft away from the transfer box. I see cable legnths that reach 100 ft but most are 25 and 50. Are there issues associated with having a 60ft cable? I would imagine I could have one custom made but I do see an Iron Box cord out there that is 65 ft.
Any suggestions??
Hi Gene,
Lengths of cord availability are often determined by demand.
If you can find a correctly rated 65ft cable, there should be no issue.
Good luck and stay safe.
hello i have a 7500w generac portabl.can i run a 100 foot 10/3(4 prong) to the new generator outlet on the side of my house which the 10/3 circuit extends another 30 feet to the panel tranfer switch.
i only run the 220 well pump as needed and the 220 electric h/w heater as needed,fridge constantly on during power outages.no electric stove or dryer to be used.so total distance from generator to transfer switch is 130 feet
Hi Scott,
Although you will be able to get the power needed to run your fridge, and the 220 applications periodically, you might consider upgrading to 8 Gauge in both lengths.
You can’t predict the future, but if you try to access the full limit of your generator, you may have to much total length for 10 Gauge.
Good luck and stay safe.
Ray
I have some lights and they are all at 600w and I have 12. I am at a loss as to what type of cord to get, I have recently bought a pulsar 10000 gas generator I am totally confused by Amps and wattage and I have no one to ask. Can this one generator power provide me with power to cover at 12 lights as I works out to 7200 w? Can I use three t 30 Amp with L14-30 plug and four 5-15R receptacles with two in-line breakers?
please help ray
I don’t know the generator you mention, but in general, you can use the following guidelines for the use of the available amps.
I HIGHLY RECOMMEND CONTACTING PULSAR with your situation.
Try Pulsar-products.com or Phone: (909) 218- 5292
In general, you’ll need at least a 10gauge cord to handle 30 amps.
Does your Pulsar generator have the 30amp plug AND the 50amp plug? You didn’t mention 50amp so I’ll assume not.
Keep in mind that the running watts for such a unit is 8000 watts.
If you need to power 7200 watts of lights, you’ll need to allocate the power supplied (Rated watts is often generous when stated by the manufacturer).
Remember, at 30 amps supplied from 240 volts, you can access 7200 watts maximum from that receptacle (you’d probably want to not push it)
Does your unit allow you to use the 30amp receptacle at 240 volts and the 5-15R’s at 120 volts at the SAME time?
From your 5-15R at 120 volts you can get a maximum of 1800 watts (again don’t push it)
Remember a duplex 5-15R is essentially ONE. That is, you can’t get 1800 watts out of each. If you’re drawing near the maximum don’t use the other one.
So use one duplex for two lights (1200watts)
Use the second duplex for two lights (1200 watts)
Run a 30amp rated cord from the L14-30R to power the other eight (4800 watts)
If you indeed had the 50amp plug, you could probably run them all.
There are so many variables.
Know your cords and the configuration of each light and their cords and lengths when you contact PULSAR.
You should also get advice from a licensed electrician.
Good Luck,
Ray
We have this generator…
Briggs-Stratton-5-000-Watt
We live in military housing that has the system set up on the outside of the house to plug our generator into. It has a NEMA L14-30 outlet on the house. Our generator (see link above) also has an L14-30 outlet on it. Do I ONLY need the cord that has the L14-30 male and female parts to plug in my generator? I have heard people talk about plugs and cords, and I guess I’m confused as to why I would need “plugs” as well as a cord. Please help! I was going to order this 25 ft 30 amp cord. Is this all I need? As in, can I plug only this cord directly from my generator to the outlet outside of my house and I’ll be good to go? We have gas, fuel stabilizer and oil. Please advise!
Thank you!
Generator Newbie
Shelby,
Unfortunately these terms you mention get thrown around interchangeably. Generally a cord refers to a certain gauge wire with two business ends (yes male and female). Your generator has a L14-30R meaning R = receptacle. The male end is called the plug L14-30P. The house outlet should have the prongs sticking out for the female end of your cord. If it does not, then you will need to install an outlet and transfer switch. If you are a complete newbie, check with your housing authority on how to switch your home from grid power to generator power. 25 feet should be good. Remember to keep the generator well away from any dwelling where the fumes could enter. These are deadly. Let me know if you need any additional information. You are right in asking for information before letting someone sell you something you don’t need. Read the articles on safety and transfer switches on this site for general information. Good luck.
Ray
Thanks for your response! The house outlet does have the prongs sticking out, so that sounds correct that the cord is all I will need. There is a big lever near the house outlet to switch from grid power to generator power, but I am having a maintenance tech come out to show me exactly what to do in the event we need to actually hook it up.
We will definitely remember to keep it far away from the house. Thanks!
Thank you for your help! I appreciate it!
Shelby
Hello,
I recently purchased a portable Honda EU2000i generator to run my propane monitor, refrigerator, and some lights when the power goes out at my townhouse. The unit has two standard three prong 5-20R outlets and I want to connect it to a Honda APC Universal Switch, but I’m having trouble finding a 20amp outlet box and extension cord with the standard three prongs. Do they even make them?
Hi Catherine,
Can I assume that your universal switch has an outlet box suitable for a 240 volts and 30Amp four prong locking plug?
There are all sorts of adapters available (30amp to 20amp). You can check Conntek or ProFit among others.
The real issue is, switch boxes are generally set up for much more powerful generators. The 1600 running watts of your Honda unit would be enough for the needs your mentioned and would usually accessed with only extension cords and not hooked up to a transfer switch. Just remember to keep the generator well away from any living areas while in operation. I hope this helps and that I am understanding your situation correctly.
Good luck,
Ray
Hi Ray,
Thank you for your response. I’m adding the Honda 6-circuit universal transfer switch for a couple different reasons. By managing the load shed it increases the capacity of my generator approximately 20%, but the main reason is because my refrigerator is built-in and pulling it out to connect to an extension cord is not an option. The smart switch also adds a safety component. I see the adaptors on the market, but wasn’t sure if they met code. I’ve decided to contact local electrical inspector to discuss my options. Great site by the way. Lots of useful information!
Catherine, I hope you never have to use the generator for a power outage, but I’m glad you’ll be ready just in case.
You’ll find many other uses for your Honda inverter generator. Watch out, everyone will want to borrow it.
Ray
I’m thinking of purchasing a “30-Amp Power Cord for 120-volt Generator, 25-Feet” – it is 10 gauge, plugs into generator 120V Twist lock Outlet with NEMA L5-30 Plug and has a block of three 120V 20R outlets. Is using something like this safe – where’d I’d plug three things into the three plugs and then the one plug into the generator (3500 watts Rated, 4000 watts Maximum Output)?
Should it only be *small* appliances? eg, *not* a fridge and two other things?
thanks for any insight.
Hi Ken,
The Generator cord you have in mind will be a good one. 10 gauge can handle the 30 amps easily.
Think of it this way, your generator is sending up to 30 amps at 120 volts from your generator through the cord.
That means, at the business end of your cord, you can access these amps however you choose. Your limitations are the 20 amp plugs.
You can use up to 10 amps in each of the three plugs to access your 30 amps, or any combination, not exceeding 20 in any one.
The question is your refrigerator and how large it is.
If your refrigerator is medium size, it probably uses 800 watts and 6 amps or so (check your unit’s specifications)
Remember that the example refrigerator has the surge watt requirement when it cycles which may draw as much as 2000 watts when it does.
If this is the case you may be limited to less than 1000 watts on each of the other plugs as long as what you’re plugging in doesn’t require surge watts itself.
The total watts/amps used by the three plugs should not exceed 3000 – 3500 running watts of your generator.
Hope this helps.
Make sure that the cord is UL approved. Make sure that 25 feet will keep your generator safely away from any living areas. Measure 25 feet from your refrigerator and determine if this will keep your generator far enough away.
Take care,
Ray
Thanks very much. I appreciate your time and insight.
I plan on using a 25 ft. Firman 30 AMP, 10 gauge extension cord with spit configuration – 2 outlets. The problem is that the refrigerator is located 10 additional feet from the extension order outlet. Is it safe to contact the refrigerator to an additional extension cord. The refrigerator is medium sized.
Or can I use one on the other outlets on the generators to connect a longer 10 gauge extension cord.
On the Firman 30 amp cord can I use a UL 1449 surge protector power strip for the led TV and tv box.
Hi Gabe,
You can do either of your ideas. Two cord extension is not ideal, but can be safely done. Just make sure that the second cord from the first cord is sufficiently rated. And generators are normally designed to use more than one outlet at a time, unless it has a switch to turn off the one set while the other (usually 240V) is in use. good luck and stay safe.
I’m confused about the L14-30 outlet on my generator.(Harbor Frt.3200/4000 watt) The outlet is listed as 120/240 volts.(it also has two 120v duplex receptacles)
If I use a twistlock extension cord such as the Westinghouse you have pictured, will the output be 120v to each of the three receptacles on the cord?
If so, what has to be done/used to get 240v out of the genset? For instance, if I only wanted to power a 240v welder?
Thanks
Hi Malc,
Your generator should have a switch that you can choose 240 from the standard 120 volts. When you make the switch, only your L14-30 receptacle should be powered. The cord that you see pictured is rated for this voltage, and yes, only 120volts are supplied at the plugs. To run a 240V tool, you will need a different cord that has a 240 volt receptacle at the other end to fit the plug of your welder. Hope this helps.
Ray
No switch on the genset or anything in the manual mentioning how to do what I am asking. I’m starting to believe that the extension cord for the 120v output may be wired one way and an extension for 240v may be wired differently. Maybe 120v not using all four of the prongs actively and 240v using all four. Does this make sense?
Thanks again.
Malc,
Sorry for the delayed response. If you give me the make and model of your genset, I’ll do some research for you.
Ray
I was interested in this topic, although I have a transfer switch, my friend has a generator cord which I gave him from my Westinghouse portable generator, with a 4 blade plug, other end has 4 receptacles, 5-20R, with the ground hole, 2 vertical slots and the horizontal slot next to one vert slot. As I understand it, the “regular” holes are for 15 A things, but would be 20 A if you had a plug with the horizontal blade also. The 4 slot receptacle on the gen says 120/240 w/no selector switch. The way I understand it, if you just plug in a regular NEMA 5-15 plug into the female end of the cord-you would still be drawing a max of 120/15 A, otherwise, why would they make such a cord, it would be unsafe.
You are correct Frank. Think of the generator cords that have multiple end outlets 5R-15, but the main cord is a 14-30. Each of the 15amp outlets would only provide that amount. Much depends on what you’re plugging into it.
Ray
Hi Ray,
I have a Champion 4500/3650 Gen with a Champion 25 foot 10 gauge cable with L14-30 twist lock on Gen end and 4 5-20R recepts on the biz end. If I want to run my fridge and freezer and TV and a light off those, i would want to switch my rocker switch to 240?
Hi Chad,
For a standard fridge and freezer, and with a TV and light, it doesn’t seem like your amp draw would require more than your 120 setting. But if you get flicker when the fridge cycles, you can certainly switch to 240. You might consider running a separate cord from one of your other gen outlets to your TV or light.
Ray
Also it has an RV plug on it as well, when i plug my RV into it, do i want to switch it to 240 or leave it on 120?
Hi Chad,
As long as you have the sufficient RV cord, you can switch to 240 as needed. Run 120 as long as it works for what you’re powering at the same time.
Ray
Hi, I have a 7500w (11500 starting) watt generator that I use to connect into the house via a 30amp outside receptacle then into a 30amp fuse that backfeeds into the house. We shut off then main and then have an Interlock Kit within the panel to only allow the 30amp fuse to be turned on when the main is in the off position. This works well and has saved us a couple of times during outages. The problem now though is I need to move the generator to a shed down the hill from my house where it will stay unless I need to use it. AT that point it will be moved out of the shed but stay down the hill. It’s a 150 foot run to the outside receptacle it needs to feed into. I understand there could be some voltage drop from that length, but if I go to a higher gauge, like 8 gauge for the L14-30 cord will it work ok? I have to run a well pump, furnace, refrig, etc. The generator is sized well for what I need, but the voltage drop might impact that, need to figure out how much.
Thanks, David
Hi David,
You might consider moving it closer than 150ft if possible. You can go to an 8gauge wire at 125 feet without an appreciable loss of power. Utilizing the maximum surge capability should be limited. A cord of that gauge and that length will be EXPENSIVE. It’s up to you, but that added expense might make your decision to move the generator closer when you need it an easy one. Hope this helps.
Ray
David,I have a 5500watt Generator I bought from northern tools in 2000.It will power anything I could ever need in my home.I never use too many things at once,for example after the tornado in NC in 2011 I had no power for a week left the fridge on,ran the 110volt well pump and even cycled the ac a few times when needed. I have mine in a shed 80 feet from the home and have 100feet #10/3 cable run to it. I highly recommend running an earth ground to the generator itself. I also recommend keeping a generator cranked once a month with a load on it for at least 1 hour and using ethanol free gas can usually be found no problem in most areas,,Also a new fuel filter inline will save you from any trash in tank or can. The only think I have to do is run the cable to the house when we are predicted to have any possible bad weather.If you decide to use 8 gauge try an electrical supply house for the cable and online as well to save some money.Lowes or electrical supply are pretty close on twistlock connectors.I wish someone would publish a small brochure to hand out with every new generator sold.
Thank you for the informative comment Joe.
Dave, did this help you?
Let’s still hope for good weather!
Ray
Hi Jonathan,
Each of your refrigerators are probably 800 watts? With their surge, figure 1200 watts. Your freezer probably about the same. Your well pump is probably less than 1000 watts. (check to be sure) These are typical figures. That being the case, you should have enough in your 5000 watt unit. You should have a bit of power for other essentials or luxuries. You could stretch your ability by not running everything at the same time. (e.g. freezers can be unplugged for a length of time as long as it’s closed.)
If your unit is 240volt 30 amps you should be ok at 50 feet with a 10gauge cord. You are smart to keep the generator away from your living area. I assume that a car port is well ventilated and there is no access through windows or doors to any living area. Be safe.
Double check the amp draw for your refrigerators and freezer and well pump.
Take care,
Ray
I have a female connector on my house that is connected to my breaker box. How would I connect to the generator?
Have someone familiar with such and installation determine what the capacity is. But in general, you can simply attach your portable generator via the suitable cord to the outlet.
Ray
I have been looking for a dual male cord and can’t find one. Is there such thing?
They are illegal I think. Very difficult to find. As you can imagine, what if a child were to touch the business end of the cord with power running through it.
Ray.
Hi Ray,
I have enjoyed reading your awesome informative responses. I am thinking of buying a 10,000 watt generator (7500 watts running). Need to use it to power a food concession trailer. Which generator will you recommend? What cord do I need to run from the electrical panel to the generator? Need to pull 70-60 amp into the trailer. An electrician said I need a #4 gauge? What’s your thoughts on that as well? Thanks for your attention.
Hi Sheba,
First the disclaimer, always take the advice of a professional electrician over advice you get over the internet.
The lower number gauge will allow you more distance from your generator to the panel.
Will you be using 60-70 Amps at the same time? If so, your choice of generator will not be large enough.
You will only be able to use 30 Amps or so at the same time with 7500 watts. Hope this helps.
Ray
Hi Ray! You are awesome. Thanks for your quick response. The trailer’s load capacity is 127 AMPs, at 75% leaves 95 AMPs, yes? I have an electrician whose suggestion am trying to get a second opinion on from you.
Yes, we will be using 120 amps continuosly (60 amps from each generator) – microwaves, water pump, electric chaffers, etc. I wish I could attach a diagram to show you. Please relocate to Georgia to do the work :=)
Looking forward to your responses.
Hello, Back in the 70s my father in law installed a well on some off grid land and now that we are taking the property over we would like to get the well going again. We purchased and installed a new well pump and the appropriate boxes that go with it. My brother in law made his own extension cord. When we attach the cord to the generator Honda eb5000x and flip the ac switch in switches off after about 20 seconds. I am worried that the homemade cord is wired wrong. Is there a cord with two 20Amp 120v three pronged adapters that can be striped to go into a switch box?
You can find a cord for just about anything. For something as important as that, please contact a certified electrician. Your safety should be your number one concern. Sorry I couldn’t help more.
Ray
When my house was built I had a transfer box installed to be able to plug in a portable generator and run some of the essential appliances during a power outage. My problem is that there is a female plug on the generator and a female plug into the transfer box. This would mean I need an extension cord with two male ends which I now understand is unsafe and likely a violation of electric code. Do I need to get an electrician to look at my situation and determine a solution or is there something I can do?
Thanks very much for your help.
Hi Gary,
You can’t even male male adapters anymore. I think an electrician is your best (and SAFEST) bet.
Good luck,
Ray
I d like to hook up a dura max xp10000 EH 8000 watt dual fuel geherator to my square D breaker box.The distance to the breaker box is aprox 30 or 40 feet,I want to keep it running in the shed at that distance with the window open an the exaust piped out,and want to know the size wire I need to connect to the power inlet box to the breaker panel and what size breaker to install in the panel,Im installing the power inlet box near the generator in the shed so the generator cord dosent need to be long just the cable from the inlet box to the breaker panel.does the breaker nead to be 50 amps along with the power inlet box,with 4 gauge wire romex or what?
50 Amps is a good choice. But 4 gauge wire might too more than you need. Yes it is best, but also very expensive.
Ray
My caving club intends to power its new 3HP (20A) submersible pump with a (yet-to-buy) 5000W generator in a dig project. The pump comes with a 32′ cable that we need to extend by 50′ to reach the generator (setting it up in the sinkole would asphyxiate us). I’m thinking of installing a fixed extension made with 10-gauge home wiring. As for switching the pump at the junction box, do I need a special switch or is any 20A home switch fine? Feel free to comment.
Thanks for this very helpful website.
Just my opinion. Please get a second. 10 gauge is a good fit. You might consider beefing up your junction box rather that push the limit against your pump. Good luck.
Ray
Hi , got the outlaws coming for a stay in there RV I need to know what size of cord I require for a 30 amp 125volt 200ft ? Sparky seems to think he can add 4 x 50 ft together We are butting heads on this. (hence the 200ft park spot from house)
Remind Sparky that each junction reduces efficiency as well as safety. However note that 200 foot 10 gauge cord can be quite pricey. Is that a National Lampoon reference?
Ray
I have a Honda EX3300 generator, and will need a 100-foot wire from the generator shed to the circuit breaker panel in the camp. In the future, I might get a larger generator such as 5000-watts. Please let me know what gauge of wire I should use. Thanks.
Hi John,
If you working with 120volts, drawing up to 25 amps then you should be ok with 10 Gauge up to 100 feet. If your unit is using 240 volts, then the 12 amps could go with 12 Gauge over 100 feet.
If you’re getting a larger generator in the future, then you’ll want the 10 Gauge for maximum Amp use.
As always, don’t rely solely on my advice. Get a second opinion from a certified electrician.
Hope this helps.
Ray
Hi. I read through and I still don’t get it! I guess I need a generator cord and the extension cords run off of the generator cord. Right? The generator has 4 three prong outlets like wall plugs and 1 120/240 odd looking outlet. Where do I plug in the generator cord and do I also need some kind of adapter? Thank you for your help!
Hi Sharon,
Yeah it can be confusing. Just remember that generator cords and extension cords can mean the same thing when discussing this subject. Your four three prong outlets, if they look like the ones in your home, you can plug in any household extension cord or appliance directly in them.
The other four prong outlet should have an identifier on it. Maybe L14-20 or something like that. This is because it can provide more power than the other outlets so it needs a special cord. You can find cords that fit in that plug with regular three prong outlets at the other end that you can then use your regular extension cords or plug in your appliances there. Go to Amazon and see all sorts of cords that will match your generator plug, with outlets on the other end that you can then use as you need. You can start here:
http://amzn.to/1It86r8
Good luck
Ray
Thanks for double checking Sharon!! I feel like I almost had it and this comment confirmed it for me. Ray I cannot thank you enough for this article as it’s been the most helpful thing I’ve found on the internet regarding extension cords and generators. Just bought my first one and I now feel confident in my coed decisions. THANKS AGAIN!!
hi, I just bought a duromax dual fuel 10,000w peak-8,000w running generator. the house has a 30a l-14 inlet box. the generator also has a 30a 120/240v ac receptacle. my question is: (1) can I get 8k running volts into the house through the inlet box from the sole 30a receptacle from the generator?, (2) what type of cord do I need (a 10k watt or 8k watt rated cord?). this is my first experience with generators so thank you in advance.
Hi Ray,
Your 30A 120/240 receptacle should be able to deliver up to 7200watts to your house (240 x 30 = 7200). Often when we purchase a generator rated at a certain amount of watts, we EXPECT that it can produce them all at once through one receptacle. But just like we wouldn’t expect to get that many watts out of one of the other receptacles on your generator, your L14/30 outlet can’t give you all of your rated watts. So a higher rated cord wouldn’t help, other than letting you operate further from the power source. In an emergency, it would be rare for you to need that many watts at the same time, so don’t worry too much.
Ray
Can i use multiple receptacles at the same time on my generator as long as i dont exceed the amperage ? I would like to use my 30 amp receptacle for my water heater and the 110v outlets for lamps and misc items… I have a 8200w running watt generator that should power everything easily
Hi Shawn,
Yes you may use more than one receptacle at the same time.
Ray
Ray, I just purchased a Sears/Briggs Stratton 7000 Watts /8750 starting watts portable generator for emergency outages. I do NOT plan to hook it up to the Main Electrical panel…just use it as a stand alone unit in an outside mounted area. Appliances to run at same time (rated watts): Upright freezer 600 watts, Garage fridge/freezer: 825 watts, kitchen fridge/freezer 800 watts, Microwave 1300 watts, clothes Washer 650 watts, clothes dryer: 6000 watts. No other appliances including hot water heater, media stuff, dishwasher, etc. will be run. will use propane for cooking and heating water, car battery for cell charging, wood stove for heat, blankets and sweats for bedding warmth. My question is: for the clothes dryer: Will a 50 foot 10/3 wire extension cord be adequate with the correct PLUG installed on it for the L14-30R receptacle on the generator; and a receptacle installed on the other end of the cord for use with a flat three prong dryer cord? and for the OTHER appliances: just dont exceed the 20 amp rating of the outlets on the generator, correct? Watts divided by volts=AMPS, CORRECT?
Man, Steve. You did your work! Yes what you have in your post seems right to me. Of course you’ll be running your 240V from your unit. And you may need to use the power for nothing else during drying. As always, I am not a certified electrician and you should get expert guidance and not rely on what you get on internet sites. Be safe. Be prepared. Be confident. Because you want it to be right when you need it.
Ray
Ray: I recently purchased a 7000W/8750 starting Watt generator and had a contractor install interlocks into my breaker panels with an appropriate plug in. Would a 10 gauge/25 ft generator cord rated for 7500W be safe to use? Thanks for the advice!
Hi Scott,
The cord itself should be fine. It is the connections that you want to make sure are safe. As always have a local electrician (or your contractor) approve your final.
Ray
We’re wondering what type of generator and extension cord we will need to operate a commercial ice cream vending unit specifically Taylor in a portable concession unit we have been told that voltage drop as a major problem the ice cream machines only have A3 percent deviation on voltage drop can you make any recommendations for a generator and extension cord that will have that was tolerance levels
Hi David, you’ll need to determine the amp requirements of your ice cream machine and get enough watts to handle that AND the surge or start requirements. An inverter generator operates it’s power more consistently so you might start there although they are more expensive per watt. As for your extension cord, as long as it is rated for the amp production of the generator that you purchase and has the proper plugs on both ends, you should be ok.
Hope this helps,
Ray
Looking into getting the AP4000 PORTABLE GENERATOR. It only has one duplex plug. So my question is can I get a cord that would let me use the 120V 30A NEMA L5–30R Outlet or the 120V TT 30R Outlet to power a fridge a small water pump on my aquarium a light and maybe a fan? I;m not interested in connecting to my home power supply. Thanks.
Hi Chris, I’m not quite sure I understand your question. What type of outlet is on the generator itself? You can find most any combination of male and female ends as long as the Amps match.
Ray
Chris.I purchased a Winco 15KW tractor PTO generator. It comes with a NEMA 14-60 full power plug end. I need about 20-25 foot cord. I’m debating between #6awg and # 4awg cord. I’m havin.g trouble finding a 60amp female cord end and a receptacle box. I already have the transfer switch installed. It is 200amp service with 60amp gen. breaker. I don’t want to hard wire it if I can keep from it. HELP. Thanks, Wayne
Wish I could help Wayne. I won’t be much help in finding what you need. I don’t sell items, just comment on basics. Good luck.
Ray
Hello Ray,
I am asking for advice in selecting the appropriate 25ft cord for my generator to home transfer set-up. My generator is a Generac LP5500 with rated running watts =5500 and max output starting watt= 6875. The generator has a L14-30R (locking) and four standard 120v plugs as well. On the house that I just bought there is a Reliance PB50 outlet that says it accepts a CS6364 connector. The house set-up is for 50Amp but the generator is 30amp and I would not want to overload it. Would I need a custom made cord as the generator is 30a and home transfer is set up for 50a? I am hoping I don’t need to buy a 50amp generator!
Thank you!
Hi Paul,
Your power is coming from your generator. Your transfer switch can accept up to 50Amps. That’s better than vice versa.
Talk to an electrician. Your cord is where you’ll need the right connectors. 30Amp running through and to a 50Amp will still only give you the 30Amp your generator is capable of.
Hope this helps.
Ray
Hi Ray,
Here in Florida post Irma 60+ hours no power. We have a 7500 watt generator. I’m trying to understand the extension cord rules. If I’m using a 25 foot L14-30 with three outlets, are those outlets ground zero when looking at extension cord lengths or do I add the 25′ to the length? I have a large window AC, 11.7 amps, 126O watts. A 6.5 amp, 747 watt, small refrigerator/freezer, and a small window AC, 6 amp, 560 watt. Can I use a 14 gauge 50′ extension from the large window AC to one of the L14-30 and then 50′ 16 gauge cords from the other smaller appliances all to the same L14-30? If so, am I running three 50 ft cords or three 75 ft cords. Thank you.
Hi Carolyn,
First of all please stay safe during this difficult time. If I understand your question correctly, Your main cord has the ability to carry 30 Amps through it to the three outlets at the business end? Your generator has the ability to run 220V? A 7500watt generator running 220V should be able to send the 30Amps through your cord. From here you will share that power among the three cords that you attach. Essentially you would be running 75 foot cords. The calculations are estimates, especially since the full length has different gauge cords involved. Also the estimates do not assume connecting cords to the total length. You will lose a bit with multiple cords. It does not mean that too long a cord distance will not work. You may not have the full expected power at the ends though. Surges from the different AC’s will effect the amp draw on the other lines during the surge. Hopefully you won’t be running everything at the same time. Make sure that the cords do not overheat. As always, I recommend consulting with a certified electrician. Good luck.
I have a Honda EB3000c.. I just went through Irma here in Florida. My fridge uses 470 watts the run is 100 feet. Also I have a freezer in the garage that also uses 500 watts the run is 25 feet. Last is a 5000 btu a/c in the bedroom with a 25 foot run. During Irma at night I was able to run all 3 with 1 25′ 12/3, one 100′ 16/3 to the fridge and a 25′ 16/3 to the freezer. During the day when it got hot outside the generator would pop the breaker. I believe it was the long cord to the fridge that was the problem at night no problem running all 3. I ordered today all 12/3 cords the fridge will now be on a 75′, the freezer and a/c will be on a separate 25′ cord. Running watts on all 3 less than 1500 watts. Do you think it’s doable as I’d like to keep the generator size down for fuel efficiency?
Hi Mike and Laurie,
Is your AC thermostat set at the same temp during the day? It sounds like the unit my be cycling more often, which makes it more likely that it could be competing with the periodic cycling of the refrigerator and freezer. Your cord solution may work. If not, I know it’s a pain, but you don’t need to keep the freezer and refrigerator plugged in all the time. With the doors closed They can keep the temperature down to safe levels. You just have to remember to plug them back in.
Good luck and stay safe,
Ray
Thx for the reply; The refrigerator is a newer model SXS.. When the doors are opened it turns the system off then when the doors are closed it restarts. I’ll try to keep my wife from opening it so often. If that doesn’t work I’ll rotate, unplugging the freezer and refrigerator. How long should I leave the freezer and refrigerator unplugged before plugging back in?
Thanks, Mike
Hi Mike,
I’ve heard of people unplugging their freezer for several hours, but this depends on the quality and insulation properties. You can give it the touch test. Items should remain hard. there should be no visible liquid. Items defrost from the outside/in. Good luck and stay safe.
Ray
I just purchased an RS 5500 by Generac. It came with a 20 foot Nema L14-30 plug with 4 outlets. I don’t have a transfer switch. It’s a little pricey at thiis point. Just a couple of questions:
What cords can I use for a sump pump, 2 fridge/freezer combos, furnace fan, microwave and tv?
When I first start the generator do you plug in the 4 prong outlet into the generator then plug the above into the 4 prong end.?
The generator will be about 20 feet from my house with running the cords thru my basement window.
I look forward to your response.
TP
Hi Tim,
First rule of thumb. Anything you plug in to a generator cord should be turned off until power is flowing to the item. Otherwise you can damage the item. To be safe, plug the main cord into the generator before starting it. Once started, the power is distributed to the ends of the cord. Each plug is just like a wall outlet then. The main cord can carry up to 30Amps. Those Amps are ready to share into those four plugs. Each cord that you attach at that point will be rated for how many amps it can safely carry. But no more than a total of 30 Amps can be used at one time among the four plugs.
So you’ll need to determine how many Amps your sump pump requires, get an extension cord that can safely supply those. Now you have some amount less than 30 Amps available to use in the other three plugs. Each fridge/freeze combo, furnace fan, etc can use whatever Amps remain. If you try to draw too many (more than 30 Amps), the generator will shut down.
Also, you don’t need to run everything at the same time. If you turn something off, then those Amps become available for something else.
Hope this helps. Stay safe,
Ray
I am very new about generators. I have a sportsman 4000 / 3250 watt LP. I have 2 120V outlets, I want to run my refrigerator, microwave and a lamp, what size power cord do I need. This generator run by propane. Do I need a 10 gauze or 12 gauze. At least 50 or 75 feet. What is the different between 12/2, 12/3. Please help. I want to be safe. Do I need 1 cord or 3. I will get one with 3 outlets
Hi Dessie,
Both of your 120V outlets can produce up to 20 Amps. A cord that has a 12 Gauge is a good choice which is rated for those Amps. If you want to go much longer than 75 feet, you might consider going to a 10 Gauge wire. When you have a cord with three outlets at the end, They will “share” the 20 Amps. The three items that you mention should be able to share those Amps easily. A 12 Gauge cord with three outlets will probably be 12/3. It will be manufactured to be sufficient for the three outlets. The 12 means 12 Gauge. The 3 means that there are 3 conductor wires (all 12 Gauge) that are insulated and extending the length of the cord. There is also a fourth wire, an non-insulated “ground” wire.
Review the surge vs. running watts section, especially if you (like most) are tempted to use the capacity of your generator. Your microwave will draw very little until you turn it on. Your refrigerator could require double the watts when it cycles on periodically. If you are using close to capacity of your generator, when an appliance requires a surge, it may shut down your generator.
Hope this helps, and you are right to always be safe.
Ray
I am getting a Duromax Hp8000 dual fuel generator. What extension cord or where can I get one that is between 20 to 30 feet in length.
I am a paralyzed veteran, I cannot haul around a cord 50 feet or longer.
Hi Dennis,
Thank you for your service.
Do you mean XP rather than HP?
Most hardware or home improvement stores will have 25 foot extension cords.
You will find a larger selection on websites such as Amazon.com or other sites.
Please make sure that you know the type of plug receptacle you need.
You’ll have standard three prong receptacles (like household plugs) on your generator, and you will have a larger receptacle also.
Look at the unit or in you manual and it will tell you the plug that you need on the generator end.
The other end of the cord could have the standard plugs.
The information that you’ll need will be something like L14-30 or the like.
Good luck.
Ray
Look for that designation or tell the salesperson.
Thank you so much for the quick response
Ray, I have just finished reading every Q. and Reply, through October 8, and I must say, it was quite an education! Thank you for all you know and all you have shared. I am now confident that I can run my unit safely when the next need arises here in Daytona Beach, FL.
Thank you for the kind words, Gene. I am happy to help. Anything I know is from what I read and trial and error. Please note that I am NOT an electrician, and any questions or concerns that you have should be run by a certified electrician. Safety is NOT something to take lightly.
Ray
I do have one question: On the 30-amp/125 volt RV plug on my Black Max unit it says “RV Use Only.” Should I take that literally or may I use that side to run household equipment within the usual limitations I’ve read here?
Hi Gene, typically when an RV use is stated on the generator, it usually has a different outlet called an RV Plug called a TT30R (Travel Trailer). You should also have a 30Amp plug (L5-30R)on your generator to use for more than the standard 5/20R household plugs. Travel trailer plugs usually only fit travel trailers (RV’s) If you do have a TT30R, you can get a cord that has standard plugs. So the short answer is yes with the right cord you can power household appliances.
Ray
Ray, I cannot find the cord application to use on my TT-30 RV generator outlet. I will never need this outlet for any RV connections. I need a cord/connector to use this outlet for more standard 120 household connections to say, 3-120 volt connections.Please advise.
Hi George.
Will this work?
https://www.amazon.com/Power-TechON-Adapter-Cord-Handles/dp/B072BZLKMG/ref=sr_1_26?ie=UTF8&qid=1508257705&sr=8-26&keywords=rv+cord+30+amp
Thank you again, Ray. I will shop for the correct cord. (My Black Max 3600/4500 gen has four 5/20R outlets and one TT30R but no L5/30R.)
Hi Ray, great info on using generators. I live in a part of Canada where the power goes off quite often because of the winds and rain, my question is it safe to run your generator outdoors in such weather and can I run it from inside my shed if I keep the window and door open which is about 75ft from my house, TKS
Hi Daniel,
Yes running in a shed is good. Any enclosure needs adequate ventilation. Make sure that the generator stays dry and that all connections and cords are safe from water contact.
Ray
we are trouble with our generatour it is a storm cat potable gas generatour 800watt 14v to put a heater on and i need to know what kind of extention cord to use on it
Hi Krystal,
I’m not familiar with your model of generator, however if it is a standard plug outlet like you have in your US home, a standard extension cord should work.
Depending on how long the cord needs to be, use an indoor/outdoor cord with three prongs. Ask you hardware store for 16 or 14 gauge no than about 25 to 50 feet (maximum 100 feet).
Remember to run the generator away from any living area. Make sure that your heater requires no more than 6 amps or so, or your generator may not operate the heater.
Good luck and stay warm!
Ray
Hi Ray, Its too hot in Florida after we loose power. I have a Firman 3650/4550 watt generator. I want to run a small window ac 6000BTU at night and during the day I will run a refrigerator and a freezer that’s in the garage. The freezer and refrigerator will only need a few hours a couple times a day to remain cold. I need about 50-75 ft cord. My question is which generator port? I have L5-30R (30A-120V) and two 5-20R (20A-120V) ports. And what gauge? Thanks, great site!
Hi Eddie, it sounds like you want to use the same cord for each use? Let’s say both uses are the same distance from the generator and you will plug and unplug from the same cord. If expense is not a factor, use the 30Amp with multi outlets at one end. 10-12 gauge should be fine at that length. Stay cool.
The cord can be used for things that you did not mention and you may need in the future.
Ray
I need to run cord from 7500watt generator to transfer switch about 100’ away. Would 10 gauge be sufficient at 220?
Hi Matt,
To be safe, you might want to go to 8 gauge. If you expect that you might periodically use full capacity of your generator and that length, you might experience less than the full 30Amps. If you only expected to draw up to 20-25 Amps at a time, you might be OK with 10 gauge. They get pretty expensive at that gauge. Of course consult a certified electrician to confirm.
Good luck,
Ray
Hi Ray. Will my Firman 4550w/3650w generator power my 1hp 4 gallon air compressor? Somebody in a hardware store today told me I’d destroy one of the two motors, if not both, over time. I’m really disillusioned because I bought the generator for this very purpose. Thanks in advance.
Hi Peter,
You might get another opinion by someone who can look at your air compressor. If it is 1HP, it shouldn’t need much more than 3000W. There are 4 gallon compressors with larger HP engines and that could cause you some problems running it. Did the first opinion know the HP? Or perhaps other factors?
Ray
Hi Ray.
He knew it was a 1hp unit and his stance seemed to be adamant that air compressors and generators do not work well together. You may get it working on the surface for awhile but inside you’re gradually destroying the inner workings, electrically. He was definitely qualified in that field which is why it gave me pause. And whenever you type in “starting Watts” for a 1hp compressor it always comes up around 4500.
Baffled.
Cheers
Hi Peter,
There are experts in the field. I can’t claim that I know more than someone who encounters this issue often. They are expensive items and you don’t want to cause harm to either of them. I with that I could be of more help. An air compressor “starts” often, thereby asking a lot of your generator. More than what you would normally require of it with other appliances. I suggest asking other “general” experts, AND generator manufacturers and compressor manufacturers.
Ray
I bought a Champion Duel Fuel 9000 Peak generator and it came with a 25ft – 4 prong 30amp cord to plug into generator and it has 4 outlets on the other end. I have a 30amp inlet to my panel with and interlock switch. I was wondering if I could cut off the 4 outlet end of this cords and attach a female 30amp connector to use this cord to connect my generator to the inlet or do i need to buy a whole new cord for this?
Hi Jim,
Theoretically you could do this, however you would probably void any warranty and may not be covered by insurance should anything go wrong. Please tread lightly here.
Ray
Hi again, Ray. Am I safe to use a 12 gauge, 15 amp extension cord (50ft) on the 5-20R 120V/20amp output on my generator? Am I safe, provided I don’t exceed 15 amps with my appliances? Thanks in advance
Hi Peter,
Can it be used and is it safe? It is not a good idea to put a cord in a situation where it can be misused. that said, a standard extension cord can be plugged into a wall outlet that can supply more power than the cord is meant for. It’s done all the time. ONly the amount needed to run the appliance is drawn through the cord. You have fuses in the generator and possibly the cord itself that will keep you from trying to draw too much power through the cord. To be safe do not rely on these safeguards. If you only plug in an appliance that draws less than 15Amps, it will work. Stay away from multi-outlets that might tempt someone to plug in a combination that exceeds the capacity of your cord. Be safe.
Ray
Good one. Thanks again, Ray.
I need to know what gauge wire to hook up my Champion 9000 to my electrical box out side the panel is 30 ft away
Hi Jerry, Assuming that your generator supplies 30Amps at the 240V setting, you can go with 10 gauge over that distance. 8 gauge will be better. If your unit supplies 40 Amps, stay with the 8 gauge.
Be safe.
Ray
I bought 2 3500 watt predator generators from harbor freight. They are 30 amp generators. I want to hook them up together with a parallel kit which has a 50 amp female adapter. I had my electrician put in an outlet(female)
On the electric junction box of my cabin which doesn’t require ac function. How can I connect the cabin and the generators? You said it is not recommended to use a cord with 2 male ends.
Hi Cem,
The reason that you should stay away from a cord with two male ends is that the prongs are live as soon as you connect the other end. It’s like exposing the wires. Anyone who touches them could be severely injured. Even if you take care in connecting the two ends, if somehow it came undone, you could make an extreme hazard. These types of cords are even difficult to purchase. Please be safe.
Ray
Hi Ray,
This is my first generator purchase. I just ordered have a Ryobi 3600 watt, with 120 v plugs that I will be using during hurricane season if necessary. I need to know what type of gnerator extension cord to purchase, a 10 gauge or a 12. I don’t think I need to use the larger voltage unless you think I should.
I will run a 3 door Kitchenaid refirgerator freezer , 3-4 lamps, a fan, and sometimes a hotplate and coffee pot. Will I need to turn off the fridge when using the coffee pot?
Thank you
Hi Deborah,
Congratulations on being proactive and being prepared. Take a look at the post on the website titled “What size generator do I need?”
That will give you more detailed information. Your generator should handle your refrigerator/freezer and have some power to spare.
Keep in mind that anything you try to run that has a motor in it will require running watts and surge watts. Your hot plate and coffee pot should not require these extra watts. However a hot plate, depending on it’s amp requirements may need 2000 watts or more just by itself when in use.
The gauge of your extension cord depends on the length of the cord. In general the more Amps you require, the lower the gauge. If you plan to use 25-30 amps through a single cord, go with 10 gauge. that can keep your generator a safe 50 feet away. If you use two outlets on your generator, you can split the requirements and get away with a 12 gauge. Just don’t try to run too much through one cord. It’s pretty complicated, i know, so talk to an electrician who can better explain how you can get what you want done, and stay safe.
Ray
Ray: First off, thank you for providing excellent and helpful information. I purchased a Westinghouse igen 2500 portable inverter generator, 2500 watts, 2200 running watts, 120v, 20 amp household duplex outlet. I want to run a 7.9amp refrigerator, two box fans (which likely aren’t over 1 amp each), and 2-4 lamps, with 100w bulbs. The problem is that these are in different rooms, so I would need to run an triple-tap extension cord from the generator to a central point, which is 75 feet away, and then, ideally, from the triple tap, run 15 feet to the refrigerator, 25 feet to a room with one fan and one or two lights, and 25 feet to another room with one fan and two lights. I thought, from your chart, that I might need a 10-gauge cord for that distance, but I can’t find a 75-foot 10-gauge triple tap extension cord (I can find a 100-foot 10-gauge extension cord). I’m trying to figure the best way to do this, that is, whether to use the 100-foot 10-gauge cord to the central point and go from there with 25-foot 10-gauge extension cords to the refrigerator and other rooms; or, whether to hook together a 50-foot 10-gauge and a 25-foot 10-gauge triple tap to get to the central point, and go from there with 25-foot 10-gauge or 12-gauge cords. I don’t understand which might be better. I don’t want to overkill this problem, but I don’t want to risk a fire either. Thanks for any advice you can provide.
Hi Terry,
The cord estimates are based on uninterrupted connections. That is, a 75 foot cord will have your full 20 Amps at the end of the cord, but if you use a 50 foot and a 25 foot you may have slightly less. A 10 Gauge will carry the amps you need to the business end of the cord and have them available to use at your triple-tap end. That said, when you use three cords from there, you are sharing the available 20 amps. So the three cords from there do not need to be 10 gauge as well. The three cords are then used based on what you are running. A good cord for your refrigerator, but a higher gauge would be fine if you’re only running a light from it. Hope this helps.
Good luck and stay safe,
Ray
Hello Mr. Bolger,
Question for you. I have a champion 2000watt portable inverter generator, planning to use it for a portable AC that will run on 1000watts. I needed a 25ft extension cable and ended up buying a 10G 15amp rated cable. Do you think this will work ok?
Hi Dave,
Make sure of the amp draw of you portable AC. (Less than 8 Amps)
Is the extension cord split at the end, that is, has multiple outlets on the end or only one. It seems that a 10 Gauge that is only rated for 15 Amps rather than 20 is low. Are you able to run the AC on your normal household three prong wall outlet? If so you will probably be OK.
Hi we have a generator running two cabins my question is any tips on how to protect the cords from cold and wet weather conditions. The generator sits in a wood frame cover between both units.
Hi Kahle,
Outdoor rated cords can withstand pretty cold conditions. And they should be waterproof. The connections should be kept dry in all instances, especially from becoming submerged. Are they single cords from the distance from generator to the cabins?
Think of holiday lights with extension cords and light string connections. They usually function fine even in the rain.
Hope this helps. Stay safe.
Ray
Hi Ray ,
I have a 5000W Coleman generator more than 10 years old but always runs like a champ when needed. It has a L14-20 plug but I cannot find one of these cords with household plugs at the end – everything seems to be L14-30 now. I did see on Amazon an L14-20 to L-14-30. My question is can I buy this “converter cord” and then plug in a L14-30 extension cord with household plugs to that? I will still only be getting 20 amps even though cords would be rated up to 30, right? You are so helpful with your straightforward explanations. Thank you!!!
Hello Lora Lee,
You are very fortunate to have such a reliable generator. You must keep it well maintained while not in use.
You should be able to connect the cords and the amp flow will be determined by that generated by the generator.
In general, the fewer extension cords in a single line, the better.
You can use a higher rated cord than the amps produced but should not go vice versa.
I’m surprised that you can’t find the cord that you want. I learned something new.
Ray
I have an Energizer EZV3200 generator which has an L5-30R outlet. My home is wired for generator, but has an L14-30P pronged outlet with 4 prongs. Is there a custom cord I can find to connect or and adaptor that will work?
Hi Greg. There are adapters available like this: https://www.amazon.com/NEMA-L5-30P-L14-30R-Plug-Adapter/dp/B0091UEVL4
You can find others if you look around. Google L5-30P to L14-30R adapter.
The single 125V hot wire from the L5-30 configuration is split to provide power to both hot wires needed for the L14-30.
Stay safe and good luck.
Ray
Thanks Ray. I guess another alternative might be to construct my own cord with an L5-30P on one side and an L14-30R on the other. Would this be better than getting an adapter or more costly and complicated?
Hi, I have an RS5500 Generac generator. My question:when I want to power my 2 fridge/Freezer combos and my heater fan. do I plug the NEMA cord into the generator first then start it for a few minutes before I connect my loads? Secondly my generator will be running about 20-40 feet from the back of my house so what gauge cords should l use and length? I look forward to your response.
Hi Tim,
The safe gauge depends on how many amps you are running through a cord.
If 20 amps (standard three prong plug) you can get away with 12 gauge.
If 30 amps (if you have a L14-30R) you want to go with 10 gauge.
You should be OK with 50 foot cords.
Good luck and be safe,
Ray
Thanks Ray for the info.
Can I cut the extension cord end off of the NEMA plug that came with the generator and add the end of a dryer cord and run my generator off of the 220 dryer plug. With the main off of course I could run what I need without extension cords.
Hi Tim,
If I understand your question, although it may be possible, it is not recommended. You would essentially be making a male to male cord which are dangerous and I believe illegal. You would be better advised to wire into your electrical panel via transfer switch. You can eliminate extension cords that way.
Please be safe.
Ray
Thanks. I will go with a transfer switch
Thank you for all the information you give! We hastily bought a Craftsman inverter generator 2300 running watts, 3000 surge during flooding in our town. It ran the one 1/3hp sump pump with a 100 ft heavy duty extension cord with no trouble. I believe we could safely use a 50 ft cord to go from outside & into the basement. It has 2 regular outlets & a single 30 amp outlet. Should we buy a cord for the 30 amp with multiple plugs or use the 120 volts as we did? We are real newbies at this but it worked so well, I’m thinking of purchasing a second to run parallel so we could run both sump pumps when the basement floods. What kit do we need if we run them in parallel? Thanks so much!
Hello Pamela,
Please remember that a 2300 running watts generator is still limited in the amount of amps that it can provide. The formula of volts x amps = watts would suggest that 2300 watts = 120 volts x 20 amps (approximately). That means that at any give time, your generator can provide 20 amps total. So no matter how many cords you run from your generator, each cord has to “share” the output. Using the “30amp” cord with multiple outlets will still only provide 20 amps that can be shared by the outlets. You could purchase a cord for your “regular” outlets that splits into more than one outlet, but you will still have to share the amps. This type of cord would be less expensive than a L5-30P that splits into multiple 5-15R.
If you had another to run parallel, you could make use of the 30 amp cord. I’m sorry that I don’t know if the Craftsman model comes with that capability. You might check with the vendor where you purchased the unit.
Be sale and good luck.
Ray
Thanks – we will go with the regular cords until we have the second generator. Yes, the Craftsman does have the capability to run parallel but the manual does not tell us what kind of kit we would need or where to purchase. We bought it at Lowe’s and that was a nightmare before we found someone who even knew if this would power a sump pump, therefore I have no faith in any answers there. Just wondered if the parallel kit would have to be the same specific brand or if this is a general type of kit.
Hi Pamela,
You can parallel two different brands of generator as long as the manufacturers say it is OK. That is only good news in that you may be able to use another manufacturer’s kit. Now that Sears is going out, I think Black & Decker purchased Craftsman. That is a secondary company to reach out to.
Ray
Hi Ray…I don’t think you have seen one of these scenarios, so here we go: i live in a truck (Nissan Frontier)…I have an inverter/generator Pulsar 4000 (4000W peak 3500W Rated)…I have a microwave, a portable heater, a dometic fridge/freezer, a coffee pot and a toaster which are all plugged into a surge protector (inside the cabb)…the surge protector is plugged into a 12 gauge extension cord which in turn is plugged into the generator (outside the cabb/inside the truck bed)…is it ok??? I have not run it yet!!! Please help…thanks a bunch! Vero
Hello Veronique,
There are two sides to your scenario. Is it possible and is it safe?
The items that you wish to power with your generator will work, although probably not turned on at the same time.
However closed compartment operation of electrical items must be done with caution.
Also running the generator in the truck bed might be too close to the cab when you are inside it. The deadly emitting fumes are odorless and can easily enter the cab without your knowledge. The generator should ideally be operated 20 feet away from your cab in a well ventilated area.
Good luck and be safe.
Ray
Hello, I have a Cat RP7500E generator,I will hook my generator up to my house to a L14 30amp plug located on the exterior wall and it’s wired to my fuse panel via interlock switch,my generator also has a L14 30amp plug on it. My question is the best place for me to safely put the generator away from my house is about 60 feet away, what gauge cord will I need to do this? I have also noticed they don’t come in 60 foot cords it’s usually 75 foot and would 60 feet be to far away? As in would it be to much of a voltage drop?
Hi Shawn,
I think you are smart if first deciding where to safely operate the generator away from your living space. It should be well ventilated where no generator fumes can accumulate. It is recommended that you use at LEAST 10 Gauge to best utilize the power generated over that distance. If you can swing it, 8 gauge will allow you to increase the distance if necessary. Remember you will normally not utilize the full power of your generator at one time, so the minimal loss by using a longer 75 foot cord should not be a concern.
Ray
Ray I asked you in an earlier post about what gauge extension cords to use and you answered but I have another question. I realized I measured wrong and the original 12/gauge 50’ ft cord is not long enough. Can I go to 10 gauge 100 foot cords for my furnace motor and my 2 fridge/freezer combo. These cords will be going into the end of my L14-30 Nema 20 foot cord that was supplied with the generator. Both fridge/ freezer combos are rated at 4.7-5.00 amps. I figured the furnace motor wouldn’t draw more than 10 amps. Can I use three 10 gauge 100 foot cords for those appliances? Also, would a true fuel conversion work for my RS 5500 as i would like to use either propane or nat gas. Let me know. I no longer have a warranty.
Ray, since I already have three 12 gauge extension cords 50 ft in length would it be better to get a longer NEMA L14-30 twist lock 120/240 volt cord instead of three 10 gauge 100 ft cords. Just to refresh I have a Generac RS 5500 running 6875 surge watts portable generator. As always thank you.
Hi Tim,
As a rule of thumb, it is better to run a single cord rather than connect cords together.
For a distance of over 100 feet, you will want to use 10 Gauge at least. Especially if you intend to ever try to run your generator at full capacity.
You can have a longer cord if you aren’t going to draw your full 5000 watts. The longer the cord, the less power you can safely and efficiently run through it. To increase the efficiency you must go to a lower number gauge or shorten the cord.
Ray
so I can purchase four 10 gauge 100 foot cords and plug those into the end of my 20 foot L14-30 NEMA cord that was provided? I should not count the extra 20 feet from the provided twist lock cord, correct? I really do appreciate your help and knowledge about this subject.
Thanks, Tim in the Northeast.
Hi Tim,
Just to make sure that I understand, when you say four 100foot cords, you are not saying connecting them end to end to result in a 400 foot length?
You have a 20 foot, 30 Amp cord with 4 standard 3 prong outlets at the end, and you want to connect a 100 foot cord to each outlet? If this is the case, remember that the four cords will share the 30 Amps output. And yes the extra 20 feet of the main cord shouldn’t make that much difference.
Ray
I have an 8500w generator. Several outlets. One is L5-30 and one L14-30. Can I use an L5-20 cord (50 feet) with an adopter for the L5-30?
Hi Douglas,
Yes you can get an adapter to connect your L5-20 cord to your L5-30 outlet.
Ray
Hi Ray, I have the Yamaha IPower SC200i inverter generator. What is the best extension cord to use on the 30amp outlet? I wanted to find one with multiple plugs. I can only find four prongs on line for 30amps. I’m new to this so probably not looking in the right place. Since this is an inverter generator it should be safe to plug in laptops and cell phones, and a small fridge, correct? Any recommendations you can give would be great! Thank you very much!
Ray, just a follow up question, would a Champion Power Equipment 25 ft, 30 amp, 125 fan style flat generator extension cord (L5-30P to three 5-20R) work on the
Yamaha.?
Thanks John
Hi John,
Yes Champion cords will work with a Yamaha generator. Match up the amps and plug style.
Ray
Hi John,
Is the model number that you mentioned correct? I didn’t know that it has a 30Amp outlet?
But any brand extension cord with the correct plug will work. Plug styles are universal regardless of brand. Major brands are safe. Not sure about generic brands.
Yes inverters are safe with sensitive electronics. To be double safe, you can use a surge protector.
Ray
Hi Ray,
The model is the Yamaha iPower, inverter generator, SC2000i, three prong, L5-30R,120VAC, 30A.
Thanks Ray!
Thanks for the info John.
Do you have another question?
Are you staying safe out there?
Ray
Hi Ray –
Quite the novice here, so appreciate any guidance you may have. Purchased a generator that produces 3600 running watts and 4500 start up with the primary purpose to run a sump pump when we lose power. The sump info says 9.6 amps run, 25.9 start up. Everything i read and charts i view for extension cord guidance i think are related to running watts(?), so do I need to consider the start up required when buying the extension cord?
More specifically, I have 100 ft 12 gauge which says its rated for 1875 watts (and 15 amps I believe?). Since the sump requires 9.6 to run i’m covered there, but does the start up amps cause a fire issue with the extension cord? or because its just an initial amount for a split second its ok? I can go down to 75 feet if need be, but not shorter than that to get away from the house safely when running the generator. Let me know if you need more info, and appreciate your help!
Hi Steve,
Does your extension cord have a fuse? If you try to send too much power through a cord not rated for it, it may blow its internal fuse. Fuses in extension cords is not common. Go with a lower number gauge wire if you want to be safe. You might run your question by the electrician at your local hardware store.
Be safe.
Ray
I needed an inverter type generator to run my new furnace. My 20 year old generator plugged into the outsid box to a transfer switch. My old generator has a 20 amp 120/240 volt output. The new generator has a 30 amp output. Can I put an adapter plug on a 30 amp cord to run new furnace and other appliances I used to run with my old 5000 what generator. New inverter generator supplies simar wattage?
Hi Lawrence, Yes there are adapters. I’m not sure if you are asking if you can plug your 30Amo cord into your 20Amp box with an adapter. You might wish to have an electrician change your old box to a 30amp. You might appreciate the extra versatility that more power provides.
Ray.
About to buy new generator, am concerned about need to provide a grounding rod. Some info say it is not necessary others say it might be. My previous generator 5500w did not require grounding. I am looking at a 10,000w generator with the idea of later going whole house. Suggestions for cords?
Hi Fred,
Congratulations on moving to a 10kW unit. If you are going first class like this, where you want to make sure of your cord choice is when you connect to your transfer switch. Otherwise your cord choice can be dictated by the amp draw of the item you are plugging in through the various outlets of your generator. For connecting to your home, you want to be able to fully utilize the power of your generator and make it available to your household through the various circuits. Choose the cord that will allow the maximum Amp flow (probably 8 gauge), as well as the length that will keep your generator safely away from inhabited space. Good luck and stay safe.
Ray
Hey Ray- What a phenomenal resource this page is! Thanks for all of your advice. Currently, I am building a refrigerated landscaping trailer for transporting oysters. I have insulated it thoroughly and need to wire it for a 230V AC unit that has a Nema 6-20P plug and a “coolbot” thermostat that has a regular 2 prong 120V plug. I will be powering these two devices with a generator mounted outside of the trailer near the hitch or by a 240V land feed. I would like to be able to plug the two units into a jacks(s) inside the trailer, then maybe have jack on the outside of the trailer where I could use a short cable to connect to the generator. I plan on using a generator like the WEN DF475T 4750-Watt 120V/240V Dual Fuel Portable Generator (link below). It has regular 120v outlets as well as a switchable 120/240v 30a twist lock outlet. Is it possible to run one of the 120v outlets and the 240v twist lock at the same time? Any ideas you may have as to how to simplify or intelligently wire this would be hugely appreciated. I am thinking marine/RV style cables, adapters, and waterproof outlet fixtures.Thanks! -Andrew
https://www.amazon.com/WEN-DF475T-4750-Watt-Portable-Generator/dp/B07M8FFS51/ref=ddp_kc_3/140-9911503-7328906?_encoding=UTF8&pd_rd_i=B07M8FFS51&pd_rd_r=64b00663-637d-11e9-867c-c5b0dbebe95a&pd_rd_w=y8QC5&pd_rd_wg=mXwlY&pf_rd_p=e0815646-5f2f-4605-9a93-befcd273e46a&pf_rd_r=8Z0YCHW7A4M1P0J095VF&psc=1&refRID=8Z0YCHW7A4M1P0J095VF
Hi Andrew,
Your venture sounds like an interesting and fun venture. And thank you for the kind words.
Normally when your generator has a switch, you power either/or and not both at the same time. That said, once the power is plugged into your trailer from your 240V source, you may be able to split the one 30Amp source into your two needed outlets in the trailer.
Good luck and stay safe.
Ray
Hello
From house panel there is a 30amp, orange-colored wire running to a receptacle on the back porch that the previous owner of the house used to run a dryer. Can I safely attach a 7500 watt generator to this three-wire dryer after installing an interlock kit on the panel? If so, the generator chord must have a 4 prong locking plug on the generator and on the house side, a three prong female that connects with the orange colored wire. Is this correct? Do I lose voltage (e.g., 240 to 120v) via the three-prone receptacle? Can you recommend the generator chord to use? Any info would be helpful regard plug types and sizes. Thank you, Jim
Hi Jim,
I am more of a user and less an electrician. I hesitate to offer suggestions for something like this. I suggest contacting a local electrician for your idea.
Stay safe,
Ray
Hey there,
So I just bought a generator to use for power outages as we have 2 sump pumps in the basement and I DO NOT/ CANNOT have my basement flood during a power outage. My questions is, I bought a 7500/6000 watt generator to power these 2 sump pumps. I am trying to figure out what gauge power cord I would need to power these 2 sump pumps? Both sump pumps are about 1/2 hp and I would need a good 75” to 100” of cord to get the generator away from the house at least 20”. Thanks in advance for all your help. I am also looking to set up an interlock switch down the road, but for now I’m trying to go with the less expensive option for now.
Hi Kaleb,
From what you state in your question, you will want to confirm some assumptions here. Assuming your sump pumps at 1/2 HP are less than 10 amps each. You’ll run 100 ft of 10 gauge, 100 feet from your 240 option of your generator. for that distance you probably won’t go with a lighter gauge at that distance if you want to have at or near your full power available. From there you would split the available amps (20-30) into the two pumps. The wires to your pumps from your main wire would not need to be as stout, since they only need 10-15 amp rating for each pump over a shorter distance. Double check this with a certified electrician and stay safe.
Ray
Hi there,
Newbie here. I just purchased a 7500 running watt/9400 starting watt generator for emergency back up in case of lost power during hurricane season. I have added up the number of amps for each appliance I would like to be able to run in the event of a power outage and it will not exceed 30 amps at any given time nor will the wattage exceed the generators rating. I am thinking I need at least a 10 gauge 30 amp cord with 3 available receptacle plug-ins; however, the longest cord I could find with this rating is 25 ft. If I want to ensure the generator is at least 20 feet away from my home, I would need to plug in additional extension cords to the 3 receptacles in order to reach my appliances. My question is, is this safe? (Again, newbie question – ie. 3 different extension cords off the main 10 gauge 30 amp cord to reach appliance A, B and C.) Also, What should I be sure to consider when plugging additional cords in to the 3 receptacles of the 10 gauge 30 amp cord (ie. I assume I need to ensure that each extension cord is appropriate for the amps of the appliance it is powering. Thanks in advance!
Hi Kristen,
You call yourself a newbie, but it looks like you did your homework. IF necessary, longer main cords are available on Amazon etc, but they get pretty pricey, but it may not be necessary. Your main cord with the three outlets is good. It would be unusual for you to be able to plug all three appliances into the three cord outlets using the main cords that are attached to the appliances. Just because they may not be that close together. You can plug extension cords into your main three outlets. BE SURE that these additional cords are similarly rated for the appliances that you’ll be running. And please be aware of the cord hazards, not limited to tripping, covering with rugs, keeping dry, etc.
The longer the main cord, the better. The shorter the additional extension cords, the better. You can try to plug the most power hungry appliance directly to the main cord and use the other outlets for those requiring less amp draw.
As always, talk to an electrician once your set up is decided upon.
Good luck and stay safe. I hope you won’t need it for a power outage, but find great uses for your generator.
Ray
Ray,
I have a 4000/3500 watt generator that I use for power outages. We had an extremely long one a while back, and I was wondering if a generator like this could power a hot water heater (for future uses). Out power was out long enough that we had gone through all the hot water that was in the tank, and we still needed. It was very annoying and frustrating having to heat water on the stove.so I guess what I’m asking is, can running a hot water tank be done from a generator, and is it safe? Thanks
Hi. yes you may power an electric water heater from a generator. You don’t have to run it constantly as even when not powered the water will stay hot for a period. You can then power it up again when needed. Otherwise you’ll be running your full generator when little power is needed to “maintain” the water temperature. I hope you don’t need to, but if so, stay safe.
Ray
Hi,
I have a portable 8,500/10,000 watt Generator with a 20 foot 10 gauge cord that back feeds my electric panel with a safety cut over switch on the panel. I have been using it for a few years but recently moved and I now need a 40ft cord. I see that I can run a 10 gauge cord at 30 amps up to 65 feet, but it says only 7,200 watts. Since I am at 8,000/10,000 and I am good with the distance, do I have to worry about watts? Can I still use a 10 gauge cord?
I have not found an 8 gauge cord with my 30 amp ends, and they are much more expensive. I have been using my 8k/10k generator with the 20ft 30 amp 10 gauge cord without any problems, but now that I need a 40ft cord, will it be an issue?
Thank you
Hi Mike,
Is it likely that you would use more than 7200 watts at the same time when drawing the power from your generator?
I am not sure as my generator does not tell me how much in watts I am consuming. There is a volts meter but it reads mostly the same from when I start the generator without a load and with a load on it. The number is over 200 but I haven’t paid attention to it. I think it moves slightly when the load increases. I will have to keep an eye on it next time I need to use it.
I think I only get close to 8000 when/if my central A/C kicks on. When on generator power, we do not use the electric ovens or anything else that is high in amps.
Hi Mike, you volt meter is telling you that it is on the 240 volt setting and providing this amount fairly consistently. With a 30 amp plug, you will get approximately 7000 watts available at the business end of your cord. I meant to say is is UNlikely that you will use all available power at the same time.
Using central A/C in an outage is a luxury and you might consider an alternative to that that is more efficient for your emergency cooling needs, thereby leaving some power for other creature comforts. Your decision. You know your situation best. Depending on your generator, you may be able to use another plug to provide some of the power still available in your large unit. Hope this helps.
Ray
I recently purchased a 3500/4000 champion portable generator and am waiting for my electrician to install the transfer switch outside. Once this is done I can connect the 6 switches to those areas of the house where power is needed. Ideally i want an extension/wire maximum length for #10 wire. I have a 40 ft Bougerv Nema L14-30 and another 25ft extension that I would connect to complete the length needed. I have been told that I would lose strength of power by doing this. I can’t find longer lengths. Without jumping to over $200. Would it be ok to connect the 40ft and 25 ft without safety issues or power loss. Thanks, Janet
Hi Janet,
You said you were having an electrician install your transfer switch. The expert should be asked. I am not a certified electrician. One cord is always better than two equal shorter cords, and it can be done. However you should ask your electrician for expert opinion.
Ray
Have just purchased a duromax generator with 13,000 watts 10500 running watts will hook up to a wall socket 4 prong twist fed by a #6 wire and 50 amp breaker It looks to me like I will have to have a male plug on each end of cord is this ok and what size wire in ex cord do i need
Hi Billy,
Even if you could find one, a male/male cord is dangerous and not recommended.
Also, to plug into a wall socket is dangerous for utility workers.
Rather you might add an approved transfer switch to your utility box.
Be safe.
Ray
I have a 5500 watt , 30 amp, Briggs and stratton generator. The 10 gauge cord I have has a 4 prong L14-20 female. My inlet receptical into the house is a 3 prong 50 amp CS636465. Can I buy an adapter or use the same cord for both plugs.
Hi Anthony,
They make adapters for just about any combination these days.
Just to confirm, does your L14-20 cord (male end) fit into your generator?
Asking because often a 30A generator would often have a L14-30 outlet.
Ray
Hello. I have a duromax 12000eh generator (12,000 peak watts) that has a 50 amp outlet on it. I plan on keeping the generator in the shed and running a cable to an inlet box on the side of the house. I have measured the distance and it is 50 feet with no extra room! I am trying to find out if I can Buy or make a generator cord that is 60 feet long and still be within safe perimeters. Do I have to go to 6 gauge wire? Just want to do it right. Thanks
Hi Jon,
I’ve seen advertised 50 amp cords at 75 foot cords, but usually for RV or Marine. These are often 6AWP.
If you construct your own be safe. Consult an electrician if you are unsure.
Ray
I have two large refrigerators that are 100 feet away from generator. What gauge cord would I use AND can I use two cords together with different lengths?
Hello Joani,
When you ask about two cords of different lengths, do you mean adding a 75 foot cord to a 25 foot cord to make the 100ft distance? If so, then yes it is possible, but anytime you can make the full length with one cord, you should.
Or you might run one 75 foot cord with a split receptacle. From which you can add two 25 foot cords (one to each refrigerator).
In the first example you would use two 10gauge cords.
In the second example you could use the main 10 gauge cord to supply 20 amps for that distance, and the two cords going to your refrigerators could be 12 or 14 gauge, depending on the amp draw of your refrigerators.
You didn’t mention the size of your generator. Remember that refrigerators need extra power when they surge. If both refrigerators surge at the same time, you’ll need enough wattage to account for that circumstance.
Good luck and stay safe.
Ray
Ray,
Thanks for all of the great information. I am looking to purchase my first generator to have for emergency backup use only. I am looking at a Champion Duel Fuel generator with either 3800w run/4750w starting for gas (3420w/4275w for propane) or 4000w run/5000w starting for gas (3600w/4500w propane). The main thing that I will need to power is a large refrigerator (6 amps) and then maybe a few smaller items intermittently (coffee maker, microwave, a few small lights, TV, etc.) Both of these generators have a L5-30R outlet and a 20A duplex 5-20R. I feel pretty comfortable from what I have read here that either generator and either fuel option would work, as long as I don’t try to fire up everything at the same time. For extension cords, my plan was to place the generator 25 feet from the house and run a 50 foot 12g extension cord (5-15) from one of the 20a outlets into the house. This cord (and the 20A outlet) would be dedicated solely to the refrigerator. Then I would buy one of the 25-foot 10g L5-30R compatible cords with three or four L5-20R ends to run from the 30a outlet into the house. I would plug another 50 foot 12g extension cord into one of the ends from the 30a cord and use that for the microwave, coffee pot, etc. I may also plug a power strip into one of the other ends of the 30a cord for electronics. My thinking was that I would use about 15a for the fridge and then have another 15a or so to play with from the 30a outlet. Do I have this about right? Thanks again for the good info! Kevin
Hi Kevin,
You have done some thoughtful planning. Just a couple of things with your process:
Make sure that your generator can use both the L5-30R and the 5-20R duplex at the same time.
At the end of your cord plugged into the L5-30R, you mention multiple L5-20R ends. Just making sure that the “L” is what you mean? L stands for locking and if you could get such a cord it may not be necessary. You might mean multiple standard 5-20R’s at the end of your L5-30 generator cord.
Is there a reason that you can’t run everything into your main L5-30R cord. It sounds like you’ll have enough outlets? Is there a reason that you want to run your fridge from it’s own cord plugged into your generator?
Ray,
Thanks much for the reply. I will check on whether the generator can use both the L5-30R and the 5-20R duplex at the same time. Good catch on the “L.” The three ends of the 10g 25 foot L5-30R cord would be either standard 5-20Rs or 5-15Rs and not be locking. I was thinking that it might make sense to keep the refrigerator separate from the other outlets, but now that you mention it, what you suggest makes way more sense. Do you see any issues with using a 25-foot 10g L5-30R cord with three 5-15R ends and then plugging in to one of those ends a 50-foot 12g extension cord (5-15 plug and ends)for the refrigerator and into another of those ends a 50-foot 12 g extension cord for the various intermittent uses? I could use the third end of the L5-30R cord to plug in a power strip for electronic devices. Does this all sound doable with either of the two generators I mentioned? Thanks! Kevin
Hi Kevin,
Running from one original L5-30 into split 3 sounds like it will work.
Some things to remember, even if you were able to use all three receptacles on the generator at the same time, you are still limited to the max number of amps of the generator, just shared.
Another thing you can do is unplug the refrigerator when those amps may be needed elsewhere for short periods of time.
Finally, depending on the sensitivity of your electronic devices, a power strip may not be the best option. You might consider running those from the battery of the device, or using a rechargeable Universal Power Source to supply power to your electronics. Then recharge the UPS from the generator.
Good luck and keep in mind the safety when running long cords and connections.
Ray
Hi Ray: I have a Generac RS 5500 and it came with a 20 foot Nema 14-30 cord. I was told to start the generator first then plug the 3 prong end into the generator and let it run for a few minutes prior to plugging in loads to the other end of NEMA cord. Is this correct.
Hi Timm,
First off, I always recommend following directions of a manufacturer. There are many variations among different generators where someone can say that is not important, and it could be.
What is generally a good idea is to plug in something AFTER the generator has started to even out the delivery of the power available to your appliance. Any uneven surge upon starting could damage the appliance if it is plugged in when you start the engine.
THAT may be why it is suggested to plug in the cord after the generator is started. In case something is plugged in at the business end of the cord.
Be safe.
Here is my set up then I will state my concerns. I have a XP13000EH plugged into a 50 amp inlet power box.The factory conductors supplied with the power inlet box are 8 AWG. So the 8 gauge conductors are ran from the inlet box to a 50 amp double pole breaker in my main circuit breaker panel.The main breaker panel has been equipped with an Interlock kit.I plan on going from generator to inlet power box with a 75′ 6 AWG power cord. Is 6 AWG sufficient to carry the load that distance? 2nd does the 8 AWG from inlet box to 50 Amp breaker have a chance to overheat at full draw from my house at normal house draw? Should the factory have made the 8 AWG, 6 AWG conductors also from the inlet to the 50 Amp breaker?
Hi David,
First the disclaimer: “I am not a certified electrician, and you should always consult one when installing electrical circuits for your home before installation for safety purposes”
From what I know, which is not a lot, is that normally 8 gauge is rated for 40 amps. Your 6amp cord at 75ft should be OK at that distance for 50 Amps. There are some special 8 Gauge that can be used for 50amps, but I’m not familiar with it. Again, this might be a question that you can pose in an electrical forum. I wish I could be more help. If you find out, please post here for the benefit of others. Good luck and stay safe.
I wish I had found your site prior to me purchasing a Champion #100307, 3500-watt RV Ready generator Dual Fuel 4375/3500 (Gas) or 3950/3150 (Propane). I should have gone with at least a 5000 watt. I haven’t used it except for the break in (propane) period and hopefully don’t need to use it.
If I understand correctly, the outlets on this unit are not GFCI protected. I don’t understand why a generator would not have GFCI protection if they are used out in the elements. I have a “storm shield” in the event of rain. The question I have. Should I use a GFCI adapter to the L5-30 plug (25ft 30 amp 10 gauge L5-30P to three 5-15r outlet).
Second question. This unit also TT-R30 outlet. Does it make a difference if I use the TT-R30 or L5-30R? A friend offered to give me a 25 ft TT-R30 10/3 TT-30P RV/Generator 30 Amp Plug to Lighted 3 Outlets 5-15R Adapter. If this works I can return the 25 ft L5-30R extension cord and save some money.
Good Questions Bob,
Often our readers have the best recommendations. Maybe a reader can offer their comments.
I expect for safety, a generator with a tripped GFCI at one would still be providing power to it’s other outlets. They might rather have the entire power source shut down.
For the TT-R30, you should be able to use it, or both.
Please do not rely solely on my advice.
Good Luck and stay safe.
Ray
I am buying a 10,000 Watt portable generator. I have a 30 AMP Power Inlet Box installed. I have been told that 7,500 Watts is maximum that a 30 AMP cord can supply. Do I need to move to 50 AMP to get the full value of 10,000 Watts?
Hi Tim.
Your 30A cord and Box can safely provide 7500W. You can use it with your 10000W generator, but your box will only handle the 7500W. You will not be able to utilize the full 10000W. Do you expect to need 10000W? If so you may need to install a new box and 50A cord.
Electrician ran 10 gauge wire from my panel to the outside inlet box (approx. 60 ft). I have a 30 ft, 8 gauge L14-30 generator extension cord from Iron Box. Can I use this extension cord from the generator to the inlet box? I was worried about going from 8 gauge to a 10 gauge line to the panel.
Hi Beau,
Remember that the limits to flow are limited by the smallest wire. So as long as the 10 gauge wire is rated for the amps produced by your generator, you should be OK. Do not exceed the rating of the 10 gauge wire or you risk damaging the cord and creating overheating. Good luck and stay safe.
Ray,
I just bought a Gererac GP8000e to power my house during outages. First what do you think of this machine? I want to run it in the garage and run a 125 foot cord to the house. What kind of cord do you recommend and where can I find a 125 foot cord?
Hi Duncan.
The Generac is a good company. Reliable and popular.
It is not recommended to operate the generator is a garage, ESPECIALLY if it has common walls with another structure. Even if it is a stand alone garage, deadly fumes can build up. These fumes can infiltrate other rooms through common walls. Some think that leaving the garage door open is sufficient. It is better to be safe.
As far as 125 feet cords, they may be available on Amazon or an electrical supply website. The size increments as smaller in shorter lengths, but once you reach 100 feet, just due to lower demand, the size options become fewer. Good luck and stay safe.
Ray
Im glad i found this posting. Thanks
Im new too. My issue is trying to understand why things arent running right on my new 9000 predator generator
My issue i cant figure out
Is why every 10 min. My breaker switch keeps going off
I only have running on my 1 120 volt 3 prong outlet. Is my 25 ft 12/3 gauge cord. Its only got my fridge plugged into it?
Cant figure out. Why the generator breaker swit h keeps tripping off?
Please hel me
Chas
Ccroftjr@hotmail.com
Is my problem my generator or is it the cord? Do i maybe need a thicker cord or is it my generator no good.
Hi Chas,
Is the cord in good condition? Does the cord get warm?
Try a new cord first to see if there is a problem with the cord. But this should not trip the generator?
You can also use the same cord and try a different appliance like a hair dryer to see if the same thing happens.
You want to eliminate each piece of the problem to see where the problem actually lies.
It may be a minor fix in the generator itself.
Good luck and stay safe.
Loving this page!
Looking for some help here.
I’m currently about 4 feet short and I’m going to make a 6ft extension cord. I have a 40 FT cable L14-30 already that’s molded. My question is can I make a 6Ft cable and be good? It’s also going to be rated at 30A and the same type of cable.
Thanks! I don’t want repurchase a longer cable if I can make this work
Hi Randy,
Your idea would work. But PLEASE be certain that all safety considerations are adhered to.
Especially the construction of the cord that you plan to make.
Making your own cords can also void any warranty that you have on your unit, your box and your appliances.
Manufacturers must protect themselves from liability from alterations out of their control.
Please understand that there may be any number of people who may or may not have the knowledge and skill required.
That is why cord manufacturers are under strict regulations and guidelines.
I’m planning on purchasing a Ford F150 hybrid with the 7.2kW generator. I believe that the 240 outlet is a L14-30R female. Will the electrician installing the manual transfer switch determine what kind male plug to use or will it be a L14-30R male? Also, if I’m reading the chart correctly, 100′ of #8 wire would meet the generators requirements for safe operation. Finally, could you recommend a manual or spring loaded reel to use. Thanks for your assistance.
I have a Wgen 5300s/6600 generator. I am looking for a generator cord for it. Can you tell me what are some cords that will work with it? I know very little about generators.
Hi Sharon.
I am making assumptions based on what a generator of that size normally has.
I expect you have some outlets that look like standard wall outlets.
You may also have a round outlet with either 3 or 4 holes.
Your standard outlets you might treat as a household outlet. It should provide up to 20 amps and your cord should be rated for 20 amps or more.
The round outlet probably provides up to 30 amps. Additionally, you need to know if your generator has the option to provide 120 and/or 240 volts.
Generally, as long as the cord has the correct plug configuration, it will be safe for the 30 amps that your generator supplies.
I recommend taking your manual to a hardware store and ask them to point you to the correct cords, and what you might expect to be able to do with them.
Make sure you have a cord that can handle the power supply. Most brand name cords will be OK. Be safe.
Ray
Hi Ray. Great info on this site. Thank you. I bought 2 Firman 2000w surge/1600w running generators and plan to run them in parallel. I’m want to run my refrigerator/freezer, a few lamps and maybe a laptop if we have a power outage (very likely in CA). I was going to purchase 2 Husky brand, 50 ft, 3 prong, 12 gauge, power indicating, tri tap extension cords. One plugged into one generator exclusively for refrigerator and the other plugged into the other generator to use for the small appliances. Will this work? I bought 2 inverter generators because I didn’t think 1 alone could meet my needs and they were reasonably priced at $349 each. Was I correct in buying 2 and hooking them parallel? Also, is it OK to use the tri tap extension cord on the refrigerator? Not sure if the tri tap divides amperage in 3 or what? Also trying to figure out why these cords are only $20 and other brands like Rigid are $68 without the tri tap end. This is all new for me. Thank you very much.
Hi Don,
Running parallel essentially makes the available power as if it were one unit. The cord with the three outlets “shares” the available amps. That means you can use three low amp draw items at the same time. But the total can’t exceed the amps available from the unit and through the main cord. For cords and their prices, you may check what the cords are rated for. The UL approval. The indoor/outdoor designation. Good luck and be safe. I hope you don’t need your setup for a power outage, but you’ll certainly find other uses for your inverters.
Ray
Ray,
I’ve purchased a Honda EU 7000i and have a transfer switch on the side of the house. The safest ( fume distance ) and also best theft prevention would be using a 75 foot L14 30R 4 prong cord. That’s 5500 running watts and 7000 starting watts. I think the 120 v running and starting amps are 45.8/58 amps and the 240 v is 22.9 running and 29.2 amps starting. Even though I may never need to run the full running power or starting power, what is the best guage cord with little to no loss of power ( due to 75 ft distance ) i need? I’ve been told 10 guage with 3% loss expected, but would 8 guage be better and not lose 3%? ie…what guage can run full running watts if needed? thanks
Ray- in addition. if the generator 4 prong 30 amp receptacle and the 30 amp transfer switch i believe allows my to use the 240 volts starting 7000 and running 5500 using the ONE cord. But when switching to the 120v that 30 amps receptacles only allow me the max 3600 watts . correct? So, if i use the 4 prong cord to transfer switch at 120v and use the full 3600 watts, can i run addition individual extension cords to the other 120 v generator receptacle and use other house items and run the honda 7000 at max running watts?
icebox running air conditioning running ventahood light, computer on, suddenly my firman 3 prong 30 amp plugs generator never stopped but power /electricity was out because the only plug got plugged in was out of its socket? anyone care to
suggest what happened to cause this?
Did not read through all the comments so not sure if this was touched on or not.
I have a 50amp receptacle on my home and I am looking at purchasing the Duromax 13,000EH, where I am wanting to put my generator shed is about 100’ from the inlet on my home. Would it be an issue running a power cord that long, and any advice on where to locate the correct cord.
Thanks,
Hi Denver,
Wow that’s a long way to run a cord. Is the output of the generator you mentioned 50 Amps?
With minimal power loss over that distance you might have to go to #4 wire. You might need to go to a contractor supply for this.
I need help in choosing the right extension cords, with the correct AWG (18, 16, 14, or 12) for my project….
My Champion generator (6250/5000 Watts) has one L14-30R outlet, and four GFCI 5-20R outlets.
I want to attach an L-14-30 connector cord (10 AWG – 25 foot) with 4 receptacles on one end, to the L-14-30R outlet on the generator, and attach four (4) heavy duty extension cords to it for the following:
. a refrigerator (750 Watts-6.5 Amps/2200 starting watts) that is 25 feet away
. a window A/C unit (450 Watts-4 Amps) that is 75 feet away
. a microwave (1100 Watts-8.5 Amps) that is 75 feet away
. a computer/monitor (1000 Watts-8.5 Amps) that is 75 feet away
What AWG extension cords will I require for each of these 4 connections?
Lastly, to the four GFCI 5-20R outlets on the generator, I want to attach the following:
. 60 watt lamp for the bedroom that is 75 feet away
. 60 watt lamp for the living room that is 75 feet away
. 60 watt lamp for the basement that is 25 feet away
. 60 watt lamp for the basement storage room that is 25 feet away
What AWG extension cords will I require for each of these 4 connections?
Thank you for your help….!
Hi Dan,
Sounds like you might want to use the both the L14-30R and the 5-20R’s at the same time.
Does you generator have an either/or switch?
Regardless, it can only supply the total 30Amps at any given time.
For the loads that you plan for the L14-30, your proposed scenario uses very close to the maximum 30Amps available if all are running at the same time. Then when the AC or refrigerator surges, you may be asking for too much power and you unit may trip. You may keep track of when you’ll need to use something and unplug the draw from another if that happens.
For the 60 watt usage, if each is a separate cord, any safe grounded extension cord will be enough.
Please keep in mind, that many cords running through your home presents its own set of hazards.
Good luck and be safe,
Ray
Hi,
Please help clarify.
My newly purchased WestingHouse WGen9500DF DF Generator is rated at 9500 Running Watts/12500 Peak Watts (Gasoline); 8500 Running/11200 Peak Watts (Propane). I will likely use gas.
Anyway, my electrician installed a 30amp inlet plug to connect to a manual transfer switch to my house (100 amp circuit breaker box in an 1800 sq ft home). I ordered a 50 ft, 10 gauge, L14-30R. I would have asked him to install a 50 amp inlet so I could use a 14–50R cord and plug if I had known better at the time. I’m not clear if I have too much power coming from the generator going through the cord for my situation. Also, given the power of the generator, do I have the option of going with a 25′ cord?
I do understand the safe distance aspect.
Thanks for the great write-up.
Hi Cordell,
Is your generator the one that comes with the 14-50R outlet?
The cord that you bought will work with your specifications.
No use to purchase the more expensive 50Amp cord.
You may find that you have enough for typical power outages. If not then you can upgrade to utilize the full 50Amp capability of your generator.
25 or 50 ft #10 cord length should be no issue for 30Amps. Longer than 50ft and you might consider going to #8 wire.
Only 30 amps will be supplied as long as you have the correct cord plugged in. That will give you approximately 7000 watts to use.
Good luck,
Ray
HELLO RAY I PLAN ON USEING 2 EACH 50FT 12GAUGE X CORDS FROM MY GENERATOR TO MY HOUSE PANNEL WHEN POWER IS LOST. I WILL SHUT OFF OR OPEN THE MAIN BREAKER IN THE HOUSE PANNEL. COMENTS PLEASE
Will you house panel accept two cords?
Normally you would use your 30amp single cord giving you the full capacity of your generator in the one cord.
I’m impressed that you have gone more than six years answering questions. This is a great great resource. My question: From the 3000 watt generator, I’m using a 10 gauge – 25 ft. 30A 125V L5-30P to Three 5-15R Extension Cord. Since each of the three outlets is limited to 15 amps, can I run three 12 gauge – 100 foot extension cords or do I need a 10 gauge – 100 foot cord? Thank you.
Hi Edward,
Thanks for the compliment. Regarding your situation. Your generator can supply 30A. At the end of your cord where you have 3 plugs, they must share the 30A fairly equally. So if you run 3 cords from there, 100 feet of #12 will be OK as long as you don’t ask one of the cords to use most of the available 30A. Even if you don’t use the other two, running too many Amps through #12 wire over 100 feet is mot recommended. Depending on your main cord, it may have the ability to limit the Amps available at each plug anyway.
Ray
Hi, we have a small greenhouse that needs heat from 3000 watts, 2 portable heaters for using when the temperature outside dropped below 15 degrees. Te greenhouse is located 250 feet from the house, would you please suggest the type of cords we need to purchase and where? Thanks.
Hi Robert,
Are the two heaters 3000 watts each? Are you using a generator? Or planning to run cords from your home?
I recommend you check with a contractor supply outlet with your situation. They would be the best ones to answer your question.
250 feet is a long way to carry 3000 watts for most home uses.
Good luck and stay safe,
Ray
Hi! I am a sr citizen and all these numbers are very confusing! The label on my generator reads
5000W
5500 surge W
240/120v
Amp41A/20.5A
Frequent 60 HZ
I mostly am concerned about running my sump pump during an outage so my basement does not flood. Currently have a 100’ 14 G cord.
Hi Becky,
Yes these numbers can be confusing. One thing is nearly certain, your generator is plenty strong enough.
You DO need to know the amp draw of your sump pump. Or at least how many horsepower is your sump pump.
Typically a sump pump with a 1/2 HP motor would need around 5 amps.
In which case your #14 wire should be good at 100 ft.
If your sump pump is submersible (able to run below the water line), you’ll want to make sure that you connections are protected.
As always, have it checked out by a professional to be safe.
Peace of mind is invaluable.
Ray
My sump pump Zoeller M53 says its a starting amp of 24.9 and running amp between 5 and 7amps. During major storms, it can short cycle and run every 10 seconds. Looking at a generator with 7850 startup and 6250 running. My question is, i need a 50 ft extension cord. How do i need to take the high startup amps into the equation? And especially with the short cycles.
Hi Andrew.
Your equipment should be fine as listed. Keep in mind that your extension cord should be at least 10 gauge for the 30 amps. Repeated, frequent surge over time could add to the wear and tear on your generator. If only during a flood sounds that this requirement would be infrequent.
Good luck and stay safe.
Ray
Hi Ray, I have a unique question? I want to backfeed my main panel which is located 100 feet from my house panel on a pole. The service drop from my main panel on the pole to the house panel is going to be 4/0 AWG aluminum. I plan on using a 75 foot 10 gauge SJTW generator cord that is ETL listed with a mechanical interlock for the main breaker and generator breaker. I wanted to know if the 75 foot 10 gauge generator cord plus the 100 foot 4/0 AWG aluminum service drop would be to long of a distance to the house panel? Also wasn’t sure how to calculate the voltage drop because there are two separate type of feeder cables. Thanks for all the help!