If you run your wire thru conduit, that is your ground leg. Your breaker box
and all is grounded to the ground rod. You should only need to four wires in
the conduit.

Please note I am not an electrician. But I done a lot of my own wiring. (no
fires yet!)

Randy


"Don Murray" wrote in message
...


Chief McGee wrote:

This was mentioned a few days ago but would someone please clarify it
for
me.
I am installing 3-ph to the shop. It is 200A delta wound, 2
transformers on pole, 3 hot wires 1 neutral from pole, ground rod
driven
into the dirt and hooked to the neutral buss bar. Drawing with the
meter
box shows the neutral wire coming from the middle of one side of the
triangle that forms the delta. Is this what is called "center tapped"?
I think I want to run 5 wires to each machine. 3 hots, 1 neutral,
and
one ground from the machine base all the way back to the neutral buss
bar in
the sub panel. Is this right?
I also want to have a 120 outlet and 120 work light on each
machine. AT
THE MACHINE, I am going to pick one of the hot legs(NOT the
power/stinger
leg) and the neutral. Will connect the ground leg in the light to the
base
of the machine. Is this right or do I have to go all the way to the sub
panel with the wires?
Next, I have a 5-hp 220V single phase air compressor. For that I
think I need only 4 wires. 2 hots(NOT the power leg) 1 neutral, and one
ground from chassis all the way back to the neutral buss bar in the sub
panel. Is this correct?
I want this to be safe and legal. Thanks for your time, Chief.

Chief,

What you have is an open delta. You can have a look at a wiring diagram
of the bank of transformers at

http://murrayranch.com/Electricity.htm

Take a look at the diagram that is open wye-open delta. Don't concern
yourself with the primary or open wye. But the secondary open delta is
just what you have.

I can't answer your question as to the number of wires to each machine
as I don't know the inside code, my field is as a
lineman/troubleshooter.

Hope this helps,
Don