On Mon, 18 Nov 2013 18:09:29 +0100, nestork wrote:

This web site explains it fairly well:
http://tinyurl.com/y4syno6

That was interesting.
Notice the 7200V primary side of the transformer didn't look
grounded in the picture (but it must have been). Right?

Also, the ground (literally) was stated as being part of the
circuit (although I would have like them to complete the circuit
at your lamp, and then *back* to the power company (via the
ground).