Yet Another Subpanel Thread
#1
10-07-12, 06:02 AM
Join Date: Mar 2002
Location: USA
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Yet Another Subpanel Thread
I'm converting garage space into workshop space. I want to add a 100A subpanel in the workshop.
The existing 200A main panel is in the same detached garage as the workshop-to-be; the subpanel will be ~25' away from the main panel on the same wall. The wiring will run through residential attic space.
From my research, it appears that my choices are #3THHN/THWN with either a #8 copper or #6 aluminum ground in 1-1/4 inch PVC conduit, or I could use #2/3 Romex without ground.
Is my research correct?
The existing 200A main panel is in the same detached garage as the workshop-to-be; the subpanel will be ~25' away from the main panel on the same wall. The wiring will run through residential attic space.
From my research, it appears that my choices are #3THHN/THWN with either a #8 copper or #6 aluminum ground in 1-1/4 inch PVC conduit, or I could use #2/3 Romex without ground.
Is my research correct?
#3
10-07-12, 09:22 AM
or I could use #2/3 Romex without ground.
#4
12-02-12, 08:21 AM
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Ray, I tend to do the whole overkill thing. Loads will include a separate air conditioning system (the primary reason for the workshop conversion), standard garage power tools, a welder, a 20A laser cutter, occasionally an oven (not for food), a computer, and who knows what else.
Joe, something went wrong between my brain and my fingers when I started this thread... I will absolutely run a ground separate from the neutral between the main panel and the subpanel. I had intended to say "#2/3 Romex without CONDUIT."
Hopefully that makes this thread make more sense. So... am I correct that I can either use THHN in conduit or 2/3 Romex without conduit?
Joe, something went wrong between my brain and my fingers when I started this thread... I will absolutely run a ground separate from the neutral between the main panel and the subpanel. I had intended to say "#2/3 Romex without CONDUIT."
Hopefully that makes this thread make more sense. So... am I correct that I can either use THHN in conduit or 2/3 Romex without conduit?
#6
12-02-12, 09:26 AM
Group Moderator
You can get 2/3 w/g NM-b at a supply house. You will not find it at the big box.
At big orange you can get 2-2-2-4 SER AL for about $1.50 a foot. You would be limited to 80 amps but that would likely plenty for your shop.
At big orange you can get 2-2-2-4 SER AL for about $1.50 a foot. You would be limited to 80 amps but that would likely plenty for your shop.
