10-gauge vs 12-gauge extension cord for a 15-amp table saw at 100 feet: 10-gauge wins for full power and safety

A 12-gauge cord might technically handle 15 amps, but at 100 feet the voltage drop will make your saw run sluggish, overheat the motor, and trip breakers. A 10-gauge cord keeps voltage loss under 3% at full load — heavier and less flexible, but your saw gets full power and you won’t babysit the breaker. Don’t even think about 14-gauge; that’s a fire and frustration starter.