Thanks Guy's,
I'm impressed with your replies,& with the explaination of the North American Domestic supply. I always wonderd what they meant, when "Hot wire" was mentioned!

Now one final Question....
UK..240v mains supply, with 30mA RCD: you get a 'Zap', the RCD trips, your ok.

110v secondary side of Tranny:
You hold one of the current carring pins, earth your other hand, you get a 55v 'Zap',
say you can't let go, RCD don't trip because it is on primary 240v supply.
Would the 55v break down your resistance & kill you! or would the current take the route to the centre tap to earth, because it has the least line of resistance?

If you held both current carrying pins, one in each hand, you get 110v 'zap', you can't let go, would this break down your resistance & kill you?

So what is the safest & why? ... a 240v with RCD, or 110v secondary supply? Please could you tell me the 'pros & cons'with each supply option.

Very much appreciated!

PS... Paul, have you ever tried errasing a sketch of windings with a rabbit!!


All I Wanted Was A Cup Of Tea!!