Scott,
it is my prefered method . E , I and R are somewhat easily conveyed in the field.
( until you get ahold of 'em in a thread!)
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Most inspectors usually are satisfied with a service installation SSC given the calc starting with the local utilities numbers at the transformer terminals.

Unless, as you said , bigger motors are included on the load side.

A major player in the calc is the R factor, which is considered the distance / wire R. So it's just as visually relavant too...

I use Stallcup's method ( R method)

the Bussman link has negligable distances, or i think one example does 25', but can be ammended.

I often wonder, having spent phone time with milbank , anchor, etc, people on the horn, how some of these pad mounted x-formers can have a residential meter mounted right on them where the R is next to 0....

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[This message has been edited by sparky (edited 03-10-2001).]