4 Things to Know About Generator Extension Cord Gauge

Use a 10-gauge 30-amp cord for most generators Thicker wire handles more current with less voltage drop. If your generator can push 30 amps, a 12-gauge cord is undersized even with a twist-lock adapter that physically fits.

Adapters do not make a cord safer Adapters only change the plug shape, not the wire’s capacity. You are still limited by what the cord can carry, and a 12-gauge 20-amp cord will get hot under a 30-amp load.

Voltage drop can damage your tools Under a heavy load, voltage drop means your tools or appliances might not run right, and you could damage them. A 10-gauge cord avoids this problem.

Only buy a 12-gauge cord if your generator maxes out at 20 amps If you might want to use the generator’s full capacity later, buy the 10-gauge once. This is not where you save twenty bucks.