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Generator Extension Cords

extension cords for generator

Did you know that a generator must be kept away from living spaces? If you’re planning to use this device, ensure you have an adequate extension cord. This cable is designed to handle the power between your generator and plugged appliances.

But when it comes to buying a generator cord, there are so many factors to consider! In this review, I’ll answer the most common questions and take a closer look at the best extension cords for a generator. All models listed here are of the highest quality and have excellent customer feedback.

So, if you want to find a perfect generator cord for your needs, just keep reading!

Best extension cord for generators

The best generator extension cord is the Champion Power Equipment 48034. The cord can carry a lot of electrical current and can withstand extreme heat or cold.

NamePlug typeWire gaugeOperating currentVoltageMax. wattageLengthReview
Champion Power Equipment 48034

best overall

L5-30P to three 5-15R10/3 AWG30 A125 V1875 W25 ftReview

manual transfer switch and RVs

L14-30P to L14-30R10/4 AWG30 A125/250 V7500 W50 ftReview


N14-50P to CS63646/3+ 8/1 AWG50 A125/250 V12500 W30 ftReview
Watt’s Wire

best for contractors

male to three 5-15R12/3 AWG15 A125 V1875 W75 ftReview

Best extnsion cords for generator reviews

Champion Power Equipment Extension Cord – best overall

The Champion 48034 is top of the line when it comes to generator extension cords. Champion is one of the largest manufacturers of generators, and this cord is designed specifically for generators.

The cord comes in a length of 25 feet and is rated at 10 gauge. You can use this cord for generators up to 3,750 watts.

You attach one end to the generator, and the other end has 3 outlets that can carry up to 15 amps each.

Champion Power Equipment 48034 photo

What I really like about this extension cord is that it is very thick and durable. It is weather resistant, which is great if you need to use the generator during unfavorable weather. That being said, you should still make sure that both the generator and the outlets on the extension cord are not touched by water.

Champion Power Equipment 48034 is the overall best extension cord for a generator. It is a heavy duty, 10-gague cord that can be used on generators up to 3,750 watts.

Key specs

Plug type: L5-30P to three 5-15R

Length, ft: 25

Wire gauge, AWG: 10/3

Operating current, A: 30

Voltage, V: 125

Maximum wattage, W: 3750

Pattern: SJTW


Can handles large appliances such as refrigerators, freezers, and microwaves.

Made by a reputable generator manufacturer.


It doesn’t come with a fuse breaker

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RVGUARD – Best for RV and manual transfer switch


RVGUARD is another great generator extension cord, especially if you have a RV. This is because it allows for manual transfer switch. This allows you to use the cord to transfer power from the generator directly into your RV or home’s main breaker panel. This can allow you to power up everything in your RV or Home with only making one connection with the cord.

In terms of wattage, it can transfer 6,250 watts at 125 volts, and 12,500 watts and 250 volts. The heavy duty cord is weather resistant.

The cord also has a lot of user friendly perks. It has a handle attached to the plug which makes it easier to plug in and take out the cord. It also features an LED light which lights up when the cord is transferring power. Lastly, the cord is 50 feet long, which adds to its functionality.

rvguard with generator

Look no further if you need a generator extension cord for manual transfer switch or for your RV!

Key specs

Plug type: L14-30P to L14-30R

Length, ft: 50

Wire gauge, AWG: 10/4

Operating current, A: 30

Voltage, V: 125/250

Maximum wattage, W: 7500/12,500

Pattern: SJTW

Option length, ft: 10, 15, 20, 40


Manual transfer switch


LED indicator light



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Vevor – heavy-duty

Vevor is a heavy-duty 50 Amp 125/250V power cord. While it is designed for welding, it works great for heavy duty generators. It is also a great extension cord for space heaters.

The cord boasts 12500 watts of capacity, outperforming even our top list products – Champion Power Equipment 48034 and RVGUARD.

I love how easily this cable can be managed – it’s very flexible yet sturdy, so you can run this generator extension cord into the house or use it outdoors.

The cord is durable and weather resistant, and it can withstand temperatures as low as -40 degrees fahrenheight, and high as 190 degrees fahrenheight.

You can choose between a 25 foot or 50 foot length.

It can also be used to connect a generator to a manual switch box.

Vevor side view

Vevor is the most heavy-duty extension cord for a generator available on today’s market! You can rely on its exceptional power and durability!

Key specs

Plug type: N14-50P to CS6364

Length, ft: 30

Wire gauge, AWG: 6/3+ 8/1

Operating current, A: 50

Voltage, V: 125/250

Maximum wattage, W: 12500

Pattern: STW

Option length, ft: 10, 15, 20, 25, 50, 75


Can transfer up to 12,500 watts

Not too expensive


Some people have complained that the cord doesn’t stay snug in the outlet when it’s plugged in

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Watt’s Wire – for contractors

Watt's Wire

Watt’s Wire 12-gauge extension cord is great for any sort of construction work. It is 75 feet long which gives you a lot of flexibility, especially when working on large construction sites.

This cord can carry up to 15A and 1875W, which is enough for most power tools. Additionally, the three outlets are angled, which let you plug in three thick cords at once. There is also a convenient indicator light which lets you know when the cord is plugged into power.

This cord is rated at 12/3.

Watt's Wire on the floor

This is a great extension cord for job sites, as it is 75 feet long and allows you to plug in 3 different appliances at once.

Key specs

Plug type: male to three 5-15R

Length, ft: 75

Wire gauge, AWG: 12/3

Operating current, A: 15

Voltage, V: 125

Maximum wattage, W: 1875

Pattern: SJTW

Option length, ft: 2, 10, 15, 25, 50, 100


Angled outlets allow for thick cords to be plugged in at the same time

Indicator lights for when it is connected to power


Can’t power heavy machinery

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How to choose an extension cord for a generator

When choosing the best extension cord for your generator, you should consider the gauge, length, amperage and wattage limits, plug type, and material.

Gauge and length of extension cord for generator

When buying an extension cord for your generator, the first thing to consider is the gauge of the cord. The gauge is the thickness of the wire, and it is measured in terms of American Wire Gauge (AWG) – the most widespread numbers are AWG 16, AWG 14, AWG 12, AWG 10, and AWG 8.

Note that the higher the gauge number, the thinner the wire. The lower the gauge number, the thicker the wire!

A thick cord can handle more power than a thin one. Therefore, you should choose an extension cord with a lower gauge number (not more than 12 AWG) if you plan to use it with a generator.

A thicker look – fatter cord – usually means heavier gauge wires inside. But this isn’t always the case! It might simply be a thicker outerwear layer. So, make sure to read the labels before making a purchase.

The wire gauge in the extension cord influences the maximum length you could use. Here is why:

How does the length of the extension cord affect the current resistance?

The longer the cords, the more resistance they create. High resistance creates voltage drops. This, in turn, makes the generator run hotter and be less efficient; plus, it can easily damage plugged devices.

Generally, you’ll stay within 50 feet to run a cord from outside into the house. However, remember that the lower the AWG number, the longer cord you can use to supply power to your appliances.

Amperage and wattage limits of generator extension cord

Extension cords are rated according to the amount of amperage and wattage they can safely carry, both of which are determined by the wire gauge. When picking a generator cord, it’s crucial to consider the amount of wattage and amperage that the instrument or appliance connected to the extension cord will draw.

The National Electric Code (NEC) determines the cable gauge you need to use. Here are some examples of amperage limits for 3-wire extension cords:

  • 16 AWG = 10 amps
  • 14 AWG = 15 amps
  • 12 AWG = 20 amps
  • 10 AWG = 30 amps

It’s vital to consider these numbers! For instance, if you use a 16 AWG generator cord for a 15 amp device, the cord may get very hot and cause a fire hazard.

Note that various factors influence extension cord ratings; here are some specs when implementing ‘Ohm’s Law’ (P=IE) to the above-mentioned NEC wire gauge limits.

14/3 extension cordmax. 15 amperes1800 watts120 volts
12/3 extension cordmax. 20 amperes2400 watts120 volts
10/3 extension cordmax. 30 amperes3600 watts120 volts

The “/3” denotes the presence of three wires within the extension cord’s insulation.

Plug types of extension cords for generators

When using a generator, it is essential to use the right extension cords to avoid any safety hazards. The first step is to identify your home outlet type and the type of jack on the generator.

The most common types of electrical outlets in U.S. homes are NEMA 1 (two-prong) and NEMA 5-15R (three-prong). They can feed devices with current ratings from 15 to 60A and voltage ratings from 125 to 600V.

There are 4 types of outlets on the generator: 5-20R, L5-20R, L14-30R, and N14-50R. Curved-blade, twist-locking connectors are denoted by the letter “L,” while others are the straight blade and non-locking ones. Now, let’s find out what numerals mean:

  • 5-20R – 2 pole – 3 wire grounding, rated for 125V
  • L5-20R – 2 pole – 3 wire grounding, rated for 125V
  • L14-30R – 3 pole – 4 wire grounding, rated for 125/250V
  • N14-50R – 3 pole – 4 wire grounding, rated for 125/250V

Once you have identified the type of outlet, you will need to find an extension cord with a connector that matches the outlet on the generator. If you cannot find an extension cord with a connector that matches the outlet on the generator, you can use a converter to change the connector from one type to another.

Types and materials of generator extension cord

You might see letters like SJ, SJT, SEOW, SO, and others that describe your gen-cord. Each has its own set of materials and applications.

The cable can be made of thermoset, thermoplastic elastomer, or thermoplastic. A thermoset cord has a thick rubber jacket and is extremely durable. A thermoplastic elastomer cable is a medium-duty material that performs well in low temperatures. A thermoplastic cord is only used for short periods of time.

Below you’ll see what the letters stand for:

  • S – severe service cord
  • SJ – junior severe service
  • T – thermoplastic
  • H – heat-resistant
  • N – nylon outer jacket material
  • E – elastomer
  • O – oil-resistant outer jacket
  • OO – oil-resistant outer insulation and jacket
  • V – vacuum
  • W – CSA weather- and water-resistant

If you are planning to use your gen-cord outside, make sure to choose a proper model.

Safety tips for using an extension cord for a generator

Safety first! There are a few things to keep in mind when using an extension cord:

  • An extension cord must be rated for the amount of power that the generator is putting out
  • Make sure that the extension cord is plugged into a ground fault circuit interrupter (GFCI) outlet, if possible
  • If you are using an outdoor extension cord, make sure it is weatherproof and rated for outdoor use.
  • Make sure that the outlets on your generator are covered when in use.
  • To avoid a tripping hazard, do not run an extension cord under or across any walkways or driveways
  • Do not use damaged or frayed cables
  • Do not place carpet or other things on top of the extension cord
  • Do not use a male-to-male cord.

How do I connect an extension cord from my generator to my house?

An extension cord is the cheapest and the most convenient way to connect your generator. All you have to do is to plug the cable into the outlet on the generator. The opposite end of the extension cord splits into several domestic outlets, allowing you to hook up multiple devices and appliances safely.

How to ground your generator?

When using a generator, it is essential to ground it properly to avoid electrical shocks. One way to ground a generator is to use a grounding rod. To do this, drive a metal rod into the ground and connect it to the generator with a grounding wire. Another way to ground a generator is to connect it to household wiring.


Do I need a special extension cord for a generator?

Yes, using the proper extension cord is important for safety and electrical reasons. The generator’s AC outlet supply must match the AC power requirements of the equipment being powered.

What gauge extension cord for a refrigerator to a generator?

The refrigerator must be plugged into the generator through a heavy-duty extension cord. The gauge rating of the cord is determined by its application and based on length and amperage requirements. We recommend using an extension cord with a minimum of 12-gauge wire.

How long of an extension cord can I use with a generator?

The maximum distance we recommend is 100 feet, but that may be a bit longer depending on the type of equipment being used.

Is it possible to operate two extension cords off of the same generator?

Yes, you can use more than one extension cord with the generator. The number of cords you can connect to a generator depends on how many AC outlets it has and the amperage rating of each outlet. We recommend not using more than two or three extension cords, depending on how big your generator is.

Can you connect two generator cords together?

No, it is not a good idea to connect two or more extension cords.