3 Things to Know About Extension Cord Gauge for a 15-Amp Saw at 100 Feet

Use 12-gauge wire for a 15-amp saw at 100 feet A 14-gauge cord at that distance drops voltage by about 5%, which makes the saw run hot and slow, eventually damaging the motor. 12-gauge keeps voltage drop under 3%, the recommended limit for power tools.

Don’t use 14-gauge for long runs, even if it’s cheaper The extra resistance from 14-gauge at 100 feet turns into heat inside the motor windings. That heat will shorten the saw’s life, even if it still spins.

10-gauge is overkill unless you’re running a heavier tool like a tablesaw For a 15-amp circular saw, 12-gauge is the right balance. A 50-foot 12-gauge cord works fine too, but at 100 feet, stick with 12-gauge to avoid burning up the saw.