Under those conditions, you're probably fine with an 8/3g on a 40 amp main


"maurice" wrote in message
oups.com...
Okay, I appreciate the advice. Once I've figured out the total
amperage of all items which could be switched on simultaneously, then I
can add a breaker. How do I then know the guage of the wire I'll need
(ie, is there a chart somewhere that I can access?)

The furnace manufacturer recommends the furnace be on its own 15 amp
breaker, and aside from that, I normally would only be using one power
tool at a time. I've been using the garage as a shop during the summer
months, and I've yet to trip the 15 Amp breaker, if that helps.

I would like to add the 220V wiring while I'm at it, though at present,
my only 220V tool is a pressure washer, which would, whenever used, be
used on its own (just to wash the truck, etc.)

I'd rather not upgrade my service to 200 AMP unless absolutely
necessary. If that were the only way to get 220V in the garage, I'd
pass for now, and simply run a new 15 Amp run to the furnace, and stop
there.