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Old 07-13-2010, 11:21 AM   #1
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GFCI outlet feeding sub panel


I volunteered to help my co-worker wire up his new detached garage, but the situation his builder left me in has me slightly puzzled

He has:
  • already buried cable (14/3)
  • inside the house each wire in the cable is connected to a 15A breaker
  • it runs to a GFCI outlet on the deck where 1 wire serves this outlet
  • it then runs underground to an outlet on a post by his garage where the same wire serves that outlet and the other one is just inside doing nothing
So it is pretty sucky that all he has to work with is 15A and there's nothing I can do about that. Stupid builder doing minimum to code.

My question is: can I run a sub-panel off this circuit even though it is fed by a GFCI outlet? Not even sure if a sub-panel is worth it here because I'm still limited to 15A per side. But i guess it's better for him to be able to cut power to something if needed. Or should I just come into the garage and split it into max 12 devices per circuit?

Thanks.
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Old 07-13-2010, 02:15 PM   #2
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GFCI outlet feeding sub panel


I don't see any point in a sub panel. Just use the 14-3 and make two 15A circuits with a shared neutral. Be sure the breakers are on different phases and either link the breaker handles or use a 2-pole that insures that both circuits must be shut off at the same time.

The GFCI should not be an issue. Garage outlets should be GFCI protected.
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