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Old 10-27-2010, 10:18 AM   #1
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detached building subpanel 3-wire questions

first, what constitutes a "detached" building? my garage (and a small guest apt) is physically attached via a breezeway of nearly 20'. is it, by NEC definition, a detached or an attached building?

the garage has a subpanel fed by a 3-wire cable (2 hot, 1 gnd) which, in turn, is connected to the main subpanel in the house. from the discussion in a previous thread this seems to be legal prior to the 2008 NEC *if* the garage is a detached structure. however, i question the fact that the gnd of the cable is connected at the main subpanel rather than at the main panel itself. i think it should be ok but what say you?

fwiw, the house was build in the late '50s. thanks

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Old 10-27-2010, 11:19 AM   #2
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It's an attached garage; you run the calbes through the breezeway roofed ceiling.
Stick to your lawn watering schedule until it really starts to pour. After the storm you have only the same number of rest days you always had and then you need to start watering again.
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