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-   -   circuit breaker trips only when switch is wired in (http://www.diychatroom.com/f18/circuit-breaker-trips-only-when-switch-wired-120323/)

Upstater 10-16-2011 06:55 PM

circuit breaker trips only when switch is wired in
 
I'm trying to trace a very frustrating problem. Does it seem normal that a circuit breaker would only trip when a switch is wired in?
I'm wiring a shower light in a bathroom. There is just the line and load connected to a single pole switch. I got everything hooked up and turned on the breaker and it tripped. I tried connecting the line and load directly and the light stays on without tripping the breaker.
I've tried two different switches. The circuit isn't overloaded. There's not a water issue because the shower isn't hooked up yet.
There has to be short somewhere, but why wouldn't it trip anytime the circuit is completed?
Thanks

oh'mike 10-16-2011 07:05 PM

Take a picture of this---If the light works when the wires are nutted together but blows when a switch is installed then we simply don't have all the facts.

Upstater 10-16-2011 07:12 PM

I can post pics tomorrow. I'm not living there currently.

oh'mike 10-16-2011 07:17 PM

Good---I'm sure the answer will come with the picture----Mike---

a7ecorsair 10-16-2011 07:25 PM

Quote:

Originally Posted by Upstater (Post 750062)
I'm wiring a shower light in a bathroom. There is just the line and load connected to a single pole switch.

Where is the power fed, to the switch box or to the fan box?

Upstater 10-16-2011 07:43 PM

This is just a little 50watt in shower can light.
The fan is on a completely separate circuit.
The power comes in at the switch.

gregzoll 10-16-2011 07:43 PM

Dead short, due to improper wiring the circuit.

a7ecorsair 10-16-2011 08:20 PM

Quote:

Originally Posted by Upstater (Post 750115)
This is just a little 50watt in shower can light.
The fan is on a completely separate circuit.
The power comes in at the switch.

It doesn't matter that it is a 50 watt light, the circuit is either 15 or 20 amps.
So, you have power coming into the switch box on a black and white wire. This black wire is connected to the switch. You have a cable going from the switch box to the light that also has a black and white wire. This black is connected to the other screw on the switch and the two white wires are wire nutted together.

Speedy Petey 10-16-2011 08:43 PM

Quote:

Originally Posted by Upstater (Post 750062)
There is just the line and load connected to a single pole switch. I got everything hooked up and turned on the breaker and it tripped.

Well, since several posters are asking us to use our crystal balls tonight :whistling2:, mine says this is a switch loop, and he has the fixture wired all black-to-black and white-to-white.
Dead short when the switch is turned on.

If not then something is simply wired wrong. Since we do not know what wires exist in what boxes it is all a guessing game.

jimmy21 10-16-2011 09:29 PM

sounds like you have the switched wired wrong

a7ecorsair 10-16-2011 10:00 PM

1 Attachment(s)
Quote:

Originally Posted by Speedy Petey (Post 750166)
Well, since several posters are asking us to use our crystal balls tonight :whistling2:, mine says this is a switch loop, and he has the fixture wired all black-to-black and white-to-white.

Mine says the same thing....

Jim Port 10-17-2011 02:35 AM

am I the only one still using analog? http://t0.gstatic.com/images?q=tbn:A...plQ5dbDa1P7TBg

rrolleston 10-17-2011 10:53 PM

had a similar problem once. I rough wired some fixtures and ran power to the light fixture box first and then just wires to the switch and the guy doing the fixtures came in a day I was not around and did not know what he was doing and connected white to black and ground to ground in the box and then connected the switch and when the switch was turned on it would trip the breaker. because it shorted the wires out in the fixture box instead of turning the light on. Some people just don't understand even when you put black tape on the white to indicate the wires are just used for switching.


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