you need to add up your amp usage, lights, heat air con., etc., things you would normally run while in there then see if you have enough left to run the tool with the greatest draw. I have a one man hobby shop that I ran two 100 amp entrances to. Did I need that much? Probably not but I don't have any power issues.
All depend on the tools you're going to use.
200 amps is large for a shop unless you have very large tools or some that runs on 220 volts
I have pretty well all the tools you need in a shop and I run on 60 amps.
I run my garage on 15 amps. It's WAY too low, but I only blow the fuse (yes, i'm still on fuses) if I run the shop vac, table saw, lights, and space heater all at the same time. This method stinks, so I just turn off the heater when i'm cutting. I'd have to imagine that with another 35 amps it would be fine, but like the others said - depends on what you're running.
Just because an appliance uses 220 volts does not mean it requires more amps.
The average modern HOUSE uses less than 100 amps.
I doubt a "hobby shop" would require more than 50 amps but…it depends on what your hobby is.
I wired my shop with a 50 amp load - for two reasons….I had a spare 50 amp breaker and the largest amperage I could carry on the 10 guage wire I had was 50…. To date I haven't had any issues with popping breakers….or with any wires getting hot….I have run 2 - 220 tools (TS and Planer), the dust collector @110 and the shop lights all at the same time without any noticeable effect…not even a noticeable dimming when the TS kicks on.
My take on it is ,it's just like clamps you can't have enough. I have a separate 200 amp service to my shop with about 100 (110) outlets on about 14 circuits and 12 (220) outlets on separate circuits and sometimes I wish I had more.
I think you are find for a "hobby" shop. Try not to run more than two large machine at a time and unless you are using electric heat there will be no problems. Be sure your wiring from the panel to the outlets is also up to the load you will put on it. I would suggest #10 wire all around but #12 will work on the 120v outlets. Be sure you follow the code and you should get a permit because if you do have a fire your insurance company may not pay should they become aware of wiring installed with out a permit.
Fortunately my shop is similar to a1Jim's except it should have added more 240v outlets. I have had to add a couple using surface mounted cables )-;
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.
Why hasn't any one said it yet, in the words of Tim the Tool Man Taylor.."More Power" At the most I'd have 2 people in my shop, dust collection running, a 220 heater, a 110 heater, lights, and two big tools, (not us, I actually mean tools) I don't even see a dimming of the lights, I figure it doesn't cost me anything extra to have it so why not go with 200 amps….just me.
In all seriousness…if you're just a hobbyist and generally working alone in a small space with only 1-2 tools running at a time, maybe some form of dust collection, and some lights - I would think 50amp would be fine. Heck I've managed on 15 amp - now that's sad.
mics-54 I believe you because building a house you're using mostly one tool at one time and maybe a couple light which doesn't take muck power that is way different hat working in a shop.
I still say that 60 to 100 amps is enough.
I have 35 years of electrical work.
My house is fairly large and I only have 125 amps entrance which also feeds my shop.
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