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Garage electrical problem

951 Views 9 Replies 5 Participants Last post by  Bythepond88
The circuit breaker to my detached garage kept tripping. I traced the problem to an improper splice in the underground cable from the house to the garage. I fixed that with an underground approved splice kit. I double checked with a simple test light after the repair, and had power to the ends of the cable. But when I hooked the cable up to the garage wiring, nothing worked. I touched the test light to splices between the cable and garage wiring, and no light. Oddly enough, if I touch one lead of the test light to the common wire, there is a faint glow that goes out when I touch the other to the power wire.

The breaker does not trip, but there is no power when connected to the garage wire.

Apparently, there is a problem in the garage wiring (everything worked fine before the splice shorted out). Do these symptoms ring a bell with anyone. Any suggestions as to what to look for, other than to just disconnect the branch circuits in the garage one by one and track it down that way?
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So as I understand what you're saying, you have power to the garage from the wire that you repaired. If that's the case and nothing works when you hook it up to the original wiring of the garage, leave that wire detached and start taking everything apart in the garage. Somewhere there is a problem with the garage wiring. Could be a bad splice in a box, a staple that has comprimised the insulation on the NMB if that's what was used. You basically have to check it all. If you have a multi-meter that would be a BIG help over a test light. If you have one, set it on the OHMS setting and start ringing out the wires.
May I ask how you found the broken wire in the ground? It's beginning to sound like there may be another compromise underground somewhere.

How far is the run from the house to the garage? Did the garage circuit ever work properly, or is this something that just started?

I surely can't understand why the differential in voltage in the garage. If you start with 115v it should remain at that. Being you have 124v in the house, the distance of the run could contribute to a voltage drop in the garage. But the fluctuation shouldn't be happening. What size conductors are involved in the run of wire?
I've never heard of copper or aluminum rusting. That's a new one on me.
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