If you are in USA or Canada wire 120/208 three phase. If you need 440 , 480.
277 , 575 , 347 ?600 use step transformers. All your lighting and most of
your motors will work off of this system. Your utility company will have you
install a seven jaw 3 1/2 element meter to measure your single phase and
three phase loads. Try to keep away from demand metering, the penalties can
really sour a fun day in the shop if your instantaneous demands are high and
prolonged.Power factor is not something you want to have to monitor and
correct.
My two cents worth!

Pete



"Jess" wrote in message
...
Hi all,

I would like some help / advice in outfitting my shop.

For the first time in my metalworking home shop, I am able to get 3
phase service from the local power company.

In the past, I have always used a 3 phase rotary converter that I
built with the help of the group here - special thanks to Fitch and
Bob Campbell.

My question is, which voltage should I specify - and why?

I can get 208v, 220v or 440v.

What are the pros and cons, if any, between the choices?

My lights and shop equipment are all multi-tap wired and are capable
on running on any of the voltages.

I do have some small bench top and hand held machines that require
110v single phase.

I have one lathe powered by a 200v three phase motor - I would be
willing to replace this motor, if it would seem to be an advantage to
go with one of the higher voltages for other reasons.

I have hopes of going to some newer machinery in the future, most /
all of it seems to be rated for 220v, but with the notation that it is
operable on 208.

Your help and advice on this is greatly appreciated. Thanks in
advance,

Jess