I have what appears to be an open neutral problem. I'm getting 120 volts from neutral to ground. Funny thing though, the 3-wire plug-in tester shows hot & ground reversed. I know nobody switched the wires, because the problem is intermittent, and sometimes it is OK. Does anyone know the internal circuitry of the plug-in tester, and why it would show hot & ground reversed when it appears to be an open neutral?
Thanks for input guys. Very helpful! Sven, I printed your drawing and drew 3 parallel loads with one of the switches closed, the tester plugged in downstream of the loads, and the neutral open at the source. Tracing the current flow, it seems that this situation will illuminate the the same lamp configuration as L & G reversed.
[This message has been edited by Redsy (edited 03-19-2003).]
Re: Open Neutral?#23441 03/19/0306:00 PM03/19/0306:00 PM
I always recommend people using these testers to be very skeptical at what the printed table says is the problem.
Many RV drivers here carry one to check the integrity of power hook-ups on campsites, and I recall the exact same problem arising in a letter to a journal I write for. Once the loads inside the RV were all disconnected, the tester would then correctly indicate an open neutral.
Re: Open Neutral?#23442 03/25/0307:52 AM03/25/0307:52 AM