I need help. I have 4 incandescent bulbs around my patio in which the power comes through a 15A breaker outside near the pool equipment. The only items on the circuit are the 4 bulbs and 2 receptacles. I installed an outdoor switch but on occasion when the switch is turned on, the circuit breaker will trip. If I reset the breaker, and then try again, the lights will come on 80% of the time. Before I installed the swtich, I just used the breaker as my switch (note: the power coming to this breaker comes from a breaker in the main box in the house). I never had the problem of the breaker tripping when I was using the breaker as the switch. I was thinking short, but I have isolated all the wires from each other inside the junction box. The only thing I can think of now is in-rush current of the light bulbs. Does the breaker trip only when I am lucky enough to throw the switch when the 60Hz sine wave is at a peak? Any thoughts? Another thought, inside the house I have 8 bulbs on one circuit (4 ea on ceiling fan), but that circuit does not trip, but I do not know the rating of that breaker either. I also believe those bulbs are 60W.