I have a great workshop (20 x 25 ft, 2 level) that was built with no power (previous owner). I'm installing a subpanel in the shop (90A) and need to install receptacles, lights, etc. as well. I've never organized a shop before so I'm unsure how to do it (looking for advice). Here is what I planned:
Install a 20A receptacle every 5 ft down the north, east, and west walls (south-facing wall has garage doors) and two rows of lights on the ceiling. The lights will be on their own 15A breaker and each wall will have its own 20A breaker. The first receptacle on each wall will be GFCI.
Here's my question: what is the best way to route wire to the receptacles and lights? Is it better (right/wrong) to drill through the studs to run the wire directly across the wall, or to run the wire along the top plate and drop wire down to each receptacle? Since I will not finish the walls I do not know if there is a code issue for either method, or if conduit needs used. If this is just a matter of preference (i.e. not code related) then I am still interested in hearing people's opinions.
Best Answer
I prefer the "up and over" method rather than drilling thru the studs, esp. since you don't intend to finish the walls. Not sure what code says about that. I believe that exposed cable below a certain height needs to be protected (8 feet?) So that would mean running the cable in conduit for the 4-5' from the outlet to near the top plate.
When I built my shop, I used surface mounted Wiremold 4000. But because my shop is partially earth sheltered, I have very high (4.5') stem walls. I went with the raceway because shops are often "evolving" with new tools, changed layouts, evolving requirements, etc. Conduit would be less forgiving. So now when electrical needs change, all I do is pop off the covers and run whatever wiring is needed to the sub-panel, install the appropriate outlet and pop the covers back on. This may be over-kill for your needs, but wanted to let you know what I did. Also attached is a pic of the actually installation in my shop (wood-working oriented).
Some other advice: What are you planning on using your shop for? I spent hours laying mine out thinking about workflow, staging, benches, storage for small tools, etc. I have 2 basic work areas in my shop: 1) basic milling where I have the table saw, jointer and planer in one area, and 2) A free standing heavy duty bench for more detailed work like dove-tailing, sanding, gluing, routing, etc. I know this answer goes way beyond what you were asking, but I just wanted to share. Have fun setting up your shop.