Re: [CAD_CAM_EDM_DRO] Re: Re[1]: FYI: Home Depot Good buy on conns/cables 20'...

In a message dated 10/4/00 2:32:16 AM Mountain Daylight Time,
Ian@... writes:

<< I'm
intrigued that you say the two 'phases' of your power come from a centre
tapped transformer - does each house have its own transformer or is power
brought into the house on a four wire system? >>

The power is sent pole to pole at high voltage, single phase in residential
sections. There is a transformer, single phase, periodically that feeds
several houses, thus there are feed wires from the transformer to each of the
houses. This feed is usually two hots and the grounded neutral. The two
hots, 240 volts are insulated, and the other wire is usually a steal core
with aluminum wire wrapped around it so it can support the weight of the span
of wire, as well as be the neutral. The transformers centertap is the
neutral and usually grounded with a "butt" ground at the power pole. AS
"butt" ground is a wire that goes down the side of the pole, and then stapled
in a spiral at the very bottom end of the pole. Most homes have in the past
had a separate ground rod for the local ground, or sometimes grounded to a
cold water pipe. Some places use a screw at the junction box in the house to
connect the ground to the neutral at the box, and that becomes the ground.
This is an aerial system, a buried feed will use different wire.
bill