[header] How to wire a breaker circuit [title] Switch off the main power switch. [step] This should be located at the top of the breaker panel. [title] Take the cover of the breaker box off. 
[title] Use an electrical tester by putting the tip of one probe against the ground bus bar and the other against one of the screws of a circuit breaker. [substeps] Connected to this screw should be a red, black, or blue covered wire.