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