On Mon, 23 Apr 2018 13:54:22 -0700 (PDT), wrote:

On Thursday, May 27, 2010 at 10:03:40 AM UTC-5, Stormin Mormon wrote:
I've had the moment to work on 440 volt roof top heating and AC.

Once in a while, need some power to run a 120 volt device. Is it 120
volts from one leg to ground?

(Yeah, I could just check it. But I was on the roof yesterday, and not
sure how long until I get to another roof.)

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

I've got a client looking to buy 50 - 100 acres with access to 440 3 phase electricity. Question 1 - is this a heavy electric capacity? 2 - How does one figure this information out. There are power poles that traverse the frontage of the property. There are 4 wires total on the poles. One of the poles has 3 transformers on it. Any idea?

480v will usually be wye distribution and that is 277v to ground. You
will need a transformer to get 120/240 but they are readily available.
That is generally considered a "heavy" service