Re: Frank van Alstine putz putz putz

On 28 Dec 2005 13:16:11 -0800, "Bret Ludwig" <bretldwig@xxxxxxxxx>
wrote:

>
>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.

Thanks for that Bret, all seems very logical - as one would hope!

--

Stewart Pinkerton | Music is Art - Audio is Engineering
.

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