electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Two part question here. First is a basic yes or no, second is NEC reasoning/science/philosophy. This is one of those things that I am surprised that I have never come across nor though of. Say I have a building with a PV array on the roof. The building has no electrical system other than the PV source and output circuits. The PV output circuit is routed to a remote structure that has utility service and a GTI. The question is if a GES is required at the array building. In 2014 we have 690.47(D) which is quite clear, however prior to 2014, was there any requirement for a GES at the array building? 250.32 jumps to mind immediately, but of course that is for buildings supplied by a feeder. Was there no requirement or am I missing it? Now we wouldnt need a GES if a building was supplied by a single branch circuit, so is there a scientific reason why there is no GES requirement for that or a building with an array on it, but there is once a feeder is involved?