1) Should I add 2 new circuits or 3?
- does dust collector need a sole circuit?
- does Shopsmith need a sole captive circuit
- Do I need a 3rd separate circuit for adding additional lighting and receptacles?
2) Though I will let an electrician do the wiring at the box, I thought I would rough it in myself. Should I use 12 or 14 guage wire? I"m assuming that these should be 20 amp circuits?
Thanks in advance for the help!
It might make sense to put in a 3rd circuit while you have the electrician there.
I have 3 circuits in my workshop. The Shopsmith doesn't share with any other power tools. I don't have a dust collector or any other heavy load devices, but the spare circuits handle all my hand held light duty power tools.
1. SS is on its own 110/20A (didnt want to go the 220 route). I think the powerpro manual says the unit can pull 13-14A...so I err'd on the safe side.
2. Jet Dust Collector on its own 110/20A . Although the current draw under normal operation is well below 20A, these collectors can spike up 10-15A on startup (depending on manufacturer) ...so I felt Id err on the overly safe side.
3. 3rd 110/20A - available for everything else at the moment
Lighting - I went with LED lighting fixtyures ...so the existing 110/15A was plenty for what I installed, replacing some old flourescents.
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I agree -- future-proofing is a good idea, and you may well run across a big 220V machine someday that you've just gotta have.masonsailor2 wrote:Three separate 20 amp circuits should be fine for a single person shop. A 30 amp 220 circuit might also come in handy.
I did something in my shop that has worked out really well, and given me a lot of flexibility. I needed more live circuits in my basement workshop, but was limited to a couple of spare cable pulls that I had had the contractor install when finishing out a basement playroom for my kids. One of those was 12/3 cable, so I hooked it up to a 240V breaker, and installed a L14-20 twist-lock receptacle in the workshop.
The slick thing about this setup is that if you want to run a 240V machine, just install the mating plug on the machine cord, and plug it in. But if you need more 120V circuits instead, plug in a standard generator adapter cable, and it will break it out into two 120V circuits for you. These will have a shared neutral wire, but that's perfectly legit and code-compliant (unless a 120V AFCI/GFCI circuit is required).
In my case, even that wasn't enough future-proofing. Now I need to add a workroom subpanel, repurposing an existing 6/3 cable pull that was originally earmarked for a hot tub. Then I'll add a couple of 30A circuits, using L14-30 twist-lock connectors. Not to mention hooking up a rotary phase converter for the 3-phase machines in my stable ...