"Ignoramus25009" wrote in message
...
The center tapped secondary of a xfmr can be thought of as two
secondaries in series. Surely, one of them could fail. Do a mental
experiment, take a xfmr winding and imagine cutting a wire. You would
still have power in one half of the winding.

Or, possibly, somehow contact coule be interrupted after the xfmr, as
well.

Sure... but the power has been back on solid ever since, and the power
company didn't come out to 'repair' anything.

LLoyd