Generator Cords, Extension Cords & Accessories
A fuel generator is only as safe as how it's placed and connected. The right cord, a properly installed transfer switch or inlet, and good placement keep you and your utility's line workers safe.
What to Look For
Generator accessories are mostly about safety: correct ratings, correct connections and correct placement.
Gauge and rating
Choose an outdoor-rated cord whose amp rating covers the load. Thicker wire (lower gauge) handles more current over distance.
Correct connection
Never plug a generator into a wall outlet. Use a transfer switch or interlock installed by a licensed electrician.
Placement and weather
Generators run outdoors only, far from doors and windows. A running cover helps in rain without blocking airflow.
Our Picks
A 30 A transfer-switch cord, a heavy-duty outdoor extension cord and a running cover for open-frame generators.
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Picks are based on manufacturer-published specifications and the buying criteria on this page, not on paid placement or hands-on lab testing. Specs quoted are the manufacturer's; check the listing for the current model before you buy.
How to Choose Generator Cords and Accessories
A portable fuel generator can power far more than a battery station, including well pumps, furnaces and full-size refrigerators. It also brings two serious hazards: carbon monoxide and improper connections to your home's wiring. The right accessories, and the right setup, address both.
Carbon monoxide kills. The CDC advises running generators only outdoors, at least 20 feet from windows, doors and vents, and never in a home, basement, garage or crawl space, even with doors or windows open. Install battery-powered or battery-backup CO alarms inside your home.
Never backfeed
Plugging a generator into a wall outlet with a "double male" cord is dangerous and, in many places, illegal. It can energize utility lines and endanger line workers, damage equipment, and start fires. To power household circuits, have a licensed electrician install a transfer switch, a generator inlet with an interlock, or a similar approved device. Then use a cord rated for that connection, such as an L14-30 cord for a 30-amp 120/240 V inlet.
Extension cords for individual appliances
If you're running individual appliances directly from the generator, use heavy-duty, outdoor-rated extension cords. Look for:
- Outdoor jacket ratings such as SJTW or SJOOW printed on the cord.
- Adequate gauge. Lower gauge numbers are thicker. For long runs and higher loads, 12-gauge or 10-gauge cords limit voltage drop and heat.
- Amp rating that meets or exceeds the load you'll plug in.
- Three-prong grounded plugs and no damage to the jacket.
Use the shortest cord that reaches safely, uncoil it fully while in use, and keep connections off wet ground.
Running covers
Generators shouldn't run exposed to rain or snow, but enclosing them is dangerous. Purpose-built running covers and tents are designed to shield the control panel and outlets while leaving exhaust and airflow clear. Follow both the cover maker's and the generator maker's clearance instructions.
Other useful accessories
- Fuel stabilizer and approved fuel cans for stored gasoline.
- A wheel kit if your generator is heavy.
- A CO alarm for every sleeping area and level of the home.
- A heavy-duty lock and chain if the generator will run unattended.
Consider a power station first
If your goal is to run essentials such as lights, phones, Wi-Fi, a CPAP or a fridge for a few hours, a portable power station can do it indoors with no fumes or fuel. Many households use both: a power station inside and a generator outside for bigger loads.