If you really want to get picky:
Do a load calculation -- from the demand side.
The OP never was explicit as to the size of his conductors... or even if they were Cu or Al.
(I'd only consider Al for such a run, Cu is just too pricy.)
And it's only implied that this is a 240/120 three-wire scheme.
BTW, changing breakers is not going to magically throttle shop demand... unless you intend to keep throwing the breaker into a tripped condition.
Ghost...
Even ancient arc welders will perform okay with 10% voltage drops. The welder merely adjusts his stroke.
Other than the lights, may be the fans, all of the loads cited are intermittent. They are not going to stress the feeder.
The wet side of Washington State doesn't have a climate that requires air conditioning. (A de-humidifier might be desired.)
One should look to whether the shop is going to be built out with additional tool loads. I'd size it with that in mind.
If this is going to be ditched, then the pipe should be deliberately oversized by at least 'one bump.' { 2" instead of 1 1/2" } The money is in the trench, not the PVC. You don't want to be ditching twice.
Last edited by Tesla; 02/05/14 02:31 PM.
