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Old 02-08-2011, 10:21 AM   #1
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turning switch off trips breaker


so i was adding a few recessed lights onto an already existing circuit which is run off of a three way switch circuit. all of the wires that run to the lights in the basement run through the box that i tapped off of. i then disconnected the previous connection, added my hot lead and reformed the connection. then i did the same with the neutral. lights came back on. then when leaving the basement i went to turn the lights off and the breaker tripped. i cannot figure how running power through the circuit does not cause the breaker to trip, but when i turn the power off, it trips. if anyone has insight on this i would appreciate it

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Old 02-08-2011, 11:05 AM   #2
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turning switch off trips breaker


Tell us exactly everything you did. Did you find a white connected to a black and "FIX" it by connecting to the other whites?

I am betting you are actually turning ON the switch when the breaker trips.

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Old 02-08-2011, 03:36 PM   #3
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turning switch off trips breaker


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Originally Posted by nhep View Post
so i was adding a few recessed lights onto an already existing circuit which is run off of a three way switch circuit. all of the wires that run to the lights in the basement run through the box that i tapped off of. i then disconnected the previous connection, added my hot lead and reformed the connection. then i did the same with the neutral. lights came back on. then when leaving the basement i went to turn the lights off and the breaker tripped. i cannot figure how running power through the circuit does not cause the breaker to trip, but when i turn the power off, it trips. if anyone has insight on this i would appreciate it
You mentioned three-way switches.... I'm betting that you have a traveller connected to neutral or shorting to ground.... when the other traveller is active, there is no fault, but when either switch is reversed, then you get a trip.

Start by rechecking all connections at both switches.
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