4 Three Way Switches 1 Circuit I am skilled enough at electrical (in my own mind) that I run the wires and finish the drywall before I hook up the power, basically like someone who knows what they are doing. The risk is if you screwed up somewhere you might have to ruin your drywall to fix it. So I hooked up all the power on Monday and when I turned it on the circuit breaker automatically tripped. I thought I might have messed up the three ways (a 3-way switch is where two switches control one light - most people have them at the top and bottom of their stairs) because I had four of them and they are a bit tricky. I spent a few hours diagramming it out and concluded I got it right. I took today off work to run through everything, check each of my hook-ups, and install a new circuit breaker. First power-up and everything worked like a charm. Whatever the problem, I fixed it with my 4 hour run through the entire circuit. Secretly I am so relieved, because tearing out drywall would have totally SUCKED.