Originally Posted by
dgaddis
My current dilemma w/the bad neutral wire has taken a long time to figure out, and confused all the electrical engineers I work with. Here's the abbreviated longer version of the saga:
~2yrs ago I replaced the chandelier in the dining room. When I was done, moved the dining room table back, etc and flipped the breaker back on, the wife tried to turn on the lights in the china cabinet to look at the now-finished room, and....no lights. They were working at some point before changing the light, but I don't recall when we last turned it on. Further investigation showed none of the outlets in the room were working. Hmmm.
Last weekend I finally decided to figure out the issue. We're replacing all the switches and outlets in the house anyways, and that room was next. First thing was to re-check the light connection. Turned off the 'dining room' circuit, went in there, and, the light was still on. OH YEAH - the light and outlets are on different circuits! I had forgotten that detail from when I changed the light originally. Turned off the 'front door' circuit (which also includes the dining room light), re-checked the light connection anyways (it's good), then started working through the outlets in the room.
Didn't find any obvious problems. Turned the power back on...still nothing works. Maybe it's the breaker switch, so I swapped it out. Still no good.
Voltage tester shows voltage at all the outlets, but they don't work. Got an outlet tester, and it shows that the ground and hot are reversed. Well, I know for damn sure I didn't mix up the hot and ground. My electrical engineering buddies tell me it's time to to turn off the power on that circuit and call an electrician.
A MTBing buddy is a former electrician, he came over and we spent three hours going through the whole room. Checked the light connection again, light switches, and went through every outlet and all the wiring between them. Everything between the outlets checks out, but on the 'first' outlet, the hot/neutral coming from/to the breaker, we get 120V between the hot and ground as expected, but only 30something volts between the hot and neutral. I don't know of anything else on the circuit between the breaker and that outlet, but maybe there's another outlet below the house (the air handler is below that room), maybe there's a problem with it, maybe the wire has been damaged somehow, etc. So anyhow....I now know where the problem is, mostly.
Good news is, the hot and ground are not actually reversed so it's not a raging fire hazard, that outlet tester just wasn't able to show exactly what the issue. We're keeping the circuit off anyways till I get it solved, just in case, and we don't use any of those outlets anyhow.
Also, whatever the issue is, it wasn't my fault, and Fred said my switch/outlet swap-job was well done especially considering I don't know a lot about wiring and electricity. When it comes to electricity, I know it hurts, and that you need to keep the smoke in the wires.
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