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
It's an attached garage; you run the calbes through the breezeway roofed ceiling.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.