Reply by Grandpa

I believe the code says they are required in garages, unfinished basements, on kitchen counters, in bathrooms and withing 15 feet of a pool or spa (this includes whirlpool tubs). I used them in my steel shop with a concrete floor. I don’t think a bare concrete floor makes any difference. A basement is a basement. My bare shop floor looked like a garage to me so I used GFCI except on the 220V. It is not normally used on 220V unless it services a hot tub or something like that. Now with all that said local codes can require something different. Circuits that are for a dedicated appliance do not have to have GFCI. This is something like a refrigerator, freezer, washing machine or a sum pump in a basement. These trip so easily that motors can trip them and or a power outage will often trip one of them. Then you come home after a weekend away to find something green growing inside your refrigerator. Check locally first then proceed from there. I don’t think you will want one on a table saw because of the motor.