You can also use some deductive reasoning: a light or receptacle circuit that trips will be a 15-amp or 20-amp single-pole breaker, meaning it has a single hot wire and takes up one spot in your ...

Well, after installing hundreds of circuit breakers and troubleshooting ... I was heating up my coffee? Yep, the breaker tripped. Putting 24 amps on a 20-amp circuit caused an overload.