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Old 05-06-2012, 06:37 AM   #11
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Okay, I disconnected the ground pigtail from all but the first outlet in the series. I tried the pump in this outlet. after 5-6 tries, it tripped the breaker.

I'll see if I can connect it at the panel to rule out wiring in the conduit from the receptacle boxes to the panel.


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Old 05-06-2012, 07:00 AM   #12
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The problem lies between the panel and the receptacle.

I wired an outlet directly to the switch in the panel and was not able to reproduce the problem. So the ground wire must have gotten damaged in pulling it thru the conduit.

I'm going to run a new one tomorrow and see if this takes care of the issue.


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Old 05-07-2012, 12:06 AM   #13
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Quick update. It appears that used a power strip as an extension cord. When I took that out of the loop the problem disappeared. I'm still running some tests, but it appears to have some surge protection which was causing the issue.
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Old 05-07-2012, 12:50 AM   #14
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Yeah, that might explain it. Power strips with surge suppression use MOV's (Metal Oxide Varistors) which break down to a low resistance when a voltage higher than line voltage is applied. These would be connected, I think, from line to ground and neutral to ground. Everything is fine with normal line voltage, the MOV's are high resistance. Then when you turn off the pump, the inductive voltage spike temporarily breaks down the MOV causing a low resistance path to ground.
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Old 05-07-2012, 12:56 AM   #15
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Yeah, what DeafSmith said. That's a BIG thing that wasn't mentioned early on in the post.... Glad you found the problem - please report back here with the final findings if that did indeed fix the problem!
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Old 05-07-2012, 03:34 AM   #16
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Nice job DS. I was at a loss here. Seems you guys figured it out. I'm awaiting the final outcome.
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Old 05-07-2012, 03:39 AM   #17
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Took the power strip out and everything works fine. No trips.

Thanks for all the help.


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