I wouldn't go any less than 100A. I have 60A and while it's enough, I had to do some futzing around at the subpanel (which I installed when I set up the shop) to get the load balanced between the two legs so I wouldn't get dimming lights when a high-amp start-up load came on line.
In addition to the items JR mentioned, there might also be an air compressor kicking on and off automatically, and some sort of heating/cooling system (even if it's just a fan in summer, and a small electric heater in winter).
I'm getting ready to run electricity out to my (almost finished) new shop. Any advice on how much electric I need? I'm thinking 100 amps...
g.
That's exactly what I'm planning for my new shop (Still in planning stages). I figure I'll need (3) 20 Amp Circuits, 1 for each wall, plus (2) 15 Amp Light circuits and a 220VAC Circuit for my Arc Welder. And a couple of Spare 20 Amp Circuits, just in case.
Keep in mind that all Circuits will not be in use at the same time. I figure (2) 20 Amp, (2) 15 Amp, and maybe 1 other one.
Your thinking is good 100 amps will serve you well. The price difference for 60-100 isn't enough to justify skimping. You'd kick yourself if you had the chance to put in high amp service and found you needed it later.
I have 100 amps to my shop with it there is a nice sized breaker panel w/ 2 dedicated 30 amp 220 lines and 6 110 circuits.
Of the 110 circuits 1 is dedicated to lighting another to Airconditioning
leaving 4 circuits for tools and a couple of open slots in the breaker panel for expansion.
Opinions are like gas; I don't mind hearing it, but keep it to yourself if it stinks.
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