At 01:49 PM 7/11/2012, David Beierl wrote: >Open neutral will show H-N 0 V; H-G 120-240 V; N-G 0 V. In a house >or campground wired US-fashion this is a dangerous situation which >can start fires in small. DO NOT CONNECT to this. I'll explain why >separately. NO! THIS IS WRONG. There are two different "open neutral" scenarios and I was getting them conflated. Open neutral at the socket, or between the socket and breaker box, will show H-N 0 V; H-G 120V N-G 0 V. Things won't work. Open neutral between the breaker box and the service entrance is much less common but more dangerous, and will NOT give the readings I said above. It will give these instead: H-N 0-240 V; H-G 120 V; N-G 0-120 V. The closer N-G is to 0, the closer H-N will be to 120. Voltages may change abruptly as loads shift throughout the house/camp. Explanation to follow. Yours, David |
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