Garage/shop

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JdoubleU

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How should I calculate A 30 by 30 foot shop. It is almost a garage but it will be primarily used for a shop to do wood work. I will be putting in a subpanel.
 
While you may have a number of tools in your shop, the likleyhood that no more then a couple will run at a time should be a consideration. For example your worst case may be the dust collection, air compressor, and table saw at the same time. In that case 60 amps may be okay, but a 100 amp subpanel just seems to be logical unless there are other considerations. Heat / AC ect.
 
Whenever I get confronted with a shop/garage question, I always respond with "Well, Norm Abrams only uses two tools at a time.... a saw of some sort along with the dust collection system. Or the air compressor may kick on once in a while, but usually only when he's using a pnuematic tool and not an electric one." Chances are, there's more power usage for the lights in his shop than anything else, considering it's now a TV studio.

For most homeowner / DIY woodworking shops, 60 amps is plenty. 100 if you've got a big honkin' welder
 
480sparky said:
Whenever I get confronted with a shop/garage question, I always respond with "Well, Norm Abrams only uses two tools at a time.... a saw of some sort along with the dust collection system. Or the air compressor may kick on once in a while, but usually only when he's using a pnuematic tool and not an electric one." Chances are, there's more power usage for the lights in his shop than anything else, considering it's now a TV studio.

For most homeowner / DIY woodworking shops, 60 amps is plenty. 100 if you've got a big honkin' welder
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Do I need to treat it like a Garage and put all recepticals on a GFCI. Also, He is putting in a 4000 watt heater and it will pull 16.7amps. That is just .7 amps over the allowable load on a 20 amp circuit but I don't see putting it on a 30amp because of .7 amps. What are you thoughts? Then finally, when calculation the load what do you treat the building as.
 
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