"Gary Coffman" wrote in message
...
On Mon, 26 Jul 2004 02:09:49 -0700, "Harold & Susan Vordos"
wrote:
"Gary Coffman" wrote in message
.. .
snip-------

If you have 3 ph delta 220, you will be able to supply 220 1 ph for the
kilns by connecting between any two hots, but there won't be any 120
volt to neutral (delta doesn't have a neutral, and the voltage from any
hot to ground won't be 120 volts).

Not true. Phases A and C to neutral yield 120V, phase B to neutral
yields
208V. Delta panels *do* (or can) have 120 volts. My shop is wired
three
phase delta and has 5 wires, four conductors ( A, B and C phase, plus
neutral) and one ground. One avoids using the B phase for 120V,
obviously.

That's not 220 delta, Harold. That's 240 volt center tapped wild leg
delta.

Yeah, that's it, and that's apparently what Ivan has. I've never seen the
220 volt delta system you've described, not here in the west. Doesn't mean
it doesn't exist, it's just not real common.

The 240 volt winding between A and C is center tapped, like normal
household 1 ph. The center tap is used as a neutral. The winding between
A and B is a plain 240 winding with no center tap. And the B to C phase is
phantom, ie there is no third phase winding.

This makes no sense, not to me. Three phase delta, wild leg, like I have,
has three coils (three transformers, it's not an open delta system) and
there is voltage from the B phase to neutral, although it's not intended to
be used. In fact it's 208 volts,
which I have measured more than once. It is true here, and it was true when
I lived in Utah, where I learned about that the hard way when the last house
we owned (wired with three phase delta) gave some problems with wild
voltages. Turns out when the power
company installed the transformers, one of the connections had been made up
over a little insulation, which finally allowed the connection to come
loose. We had wild voltages inside, burning out a few lights fluorescent
lights. We came home from vacation to find the contents of our refrigerator
spoiled because the refrigerator hadn't been running due to the broken
connection.

This setup is used for small office buildings and light commercial
buildings where the main loads are 1 ph 120 volts or 1 ph 240 volts,
but where there are some 240 volt 3 ph motor loads, usually air
conditioning, pumps, or elevators.

That's interesting. Must be something used in your area, because here the
only systems I've seen are either three phase delta, 240 volts,
or three phase star (or wye) 208 volts. Recent experiences tell me that
the wye service is being pushed over the delta so that all phases can be
used for 120 volts.

Harold