On Tue, 18 Jun 2002, Bob Blick wrote:

>> Wye doesn't have to have a center tap to neutral if the phases are loaded
>> correctly.  With Delta, I don't know what you mean by "center tap of one
>> phase."  And I definitely wouldn't connect any phase to neutral on delta
>> unless you like to see a lot of sparks.  A direct connection to ground like
>> that will probably blow apart your whole fuse box and take you with it.
>
>The power company won't deliver power to you without a ground reference.
>All the deltas I've ever seen(and it's true I haven't dealt with many)
>have had the center of one phase grounded, and the furthest wire from that
>is called the "stinger" (for good reason).

What is the 'center of one phase' ? Do you mean like the center tap of a
transformer that delivers that phase ?

Of course there is ground involved somewhere in a power installation. The
easiest for three wire delta is three relatively large resistors connected
in wye to the phases, and the center of the wye grounded. More elaborate
schemes use discharge protectors etc in parallel with the resistors. Afaik
you HAVE to use this (delta w/o ground) if you ship power over a buried or
aerial cable with only three conductors.

I think that you refer to some sort of US style lighting/domestic power
scheme that I do not know of (wrt stinger etc).

Peter

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