How do I choose the right plug for my tool based on its amp rating?

Use the plug that matches your tool’s amp draw. NEMA 5-15 is the standard three-prong household plug for up to 15 amps. If your tool draws more than 15 amps, you need an L5-20 twist-lock plug, a matching receptacle, and a 20-amp breaker. The locking mechanism also prevents the plug from getting yanked out mid-cut, which is nice for big tools like a table saw.