Re: Frank van Alstine putz putz putz


Stewart Pinkerton wrote:

> I think you hit the nail on the head there, Chris. A 110-0-110 system
> may be legal in many States, but the whole point is *not* to allow any
> possibility of 240 volts potential above ground, so lifting that
> centre wire just won't be an option. Seems a bit sissy to we Europeans
> of course, who are used to 230 volts domestic mains, and 480 volt
> 3-phase for industrial machine tools.

Powered items that use 220/240V in the United States requiore two hot
lines, which are each 110 above ground and 220 from each other, so no
220 above ground is possible. The GROUND has to be used but there is no
requirement for the NEUTRAL to be used. Generally the common wall
outlet used for air conditioners and shop tools-routers especially-has
only the two hots and the ground. Appliances so connected must use 220
throughout: although tou could get 110 from one hot and GROUND, it's
illegal, and will trip the guffer, if one exists.

Dryers and stoves in the US are four wire, single-phase devices. The
motors generally use 110, from either hot to the neutral. Element
switching allows sections to be connected from one hot to neutral or
one hot to another. They go to a four conductor plug that supplies both
hot wires, the neutral, and the ground. GROUND is a safety connection
and may never be interrupted. NEUTRAL is treated as though it were hot
and is never shunted to ground. One, and only one, connection is
allowed, at the service entrance.

In Britspeak, ground and neutral are called "earthed" and "earthy"
although UK practice is different from US practice in some ways. I'll
leave comment on that to our UK/EU people although it's no secret in
the US-it's common to find people in Home Despot who have picked up UK
or Australian DIY homeowner books which are sold here by megachains in
total ignorance of the fact the two are very different.

.

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