Reply by BlankMan

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Posted on electric for shop

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1490 posts in 3347 days

#1 posted 11-19-2009 08:46 PM

I have a 60A Load Center dedicate to my workshop, it’s plenty because a max of 3 things, typically 2, are running at one time. That’s the cyclone and a machine, table saw or RAS or jointer etc. The 3rd thing kicks in if the air compressor is on. So if the TS, cyclone, and AC are running I’d be pulling 35A but that’s at rated for the TS, realistically I’m pulling about 25-28A so that’s my worst case. Plus a few amps for lighting which is a on it’s own circuit so I don’t lose the lights if something pops a breaker (which has yet to happen except for the new air compressor which is a whole other story).

So, for the 8 circuits in the Load Center I have one for lighting, one for the AC, one for the outlets in half the workshop another for the outlets in the other half of the workshop, then two 220V breakers. I divided up the two 220V breakers this way: Circuit 1&2 Cyclone 1-1/2HP & Jointer 1-1/2HP, circuit 3&4 20A Table Saw 3HP, Radial Arm Saw 1-1/2HP, Mill/Drill 2HP, & 180A MIG Welder. So the circuits are balanced and I never overload a single circuit.

Proper planning, efficiently balancing the circuits so some can handle two or more things at once negates the need for the brute force 200A approach for the single user. If this is a shop with multiple people running different machines at the same time that then changes the equation.

-- -Curt, Milwaukee, WI

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