dburkhardt
Member
I'm working on a PV system which has a Utility disconnect that serves a 3phase 208V panelboard. Connected to that panel board is (5) 10KW 3 Phase Inverters and (2) 3.8KW Single Phase Inverters. We are required to attach a label on the disconnect stating the max current. I calculate ~160Amps. My boss with 30years experience gets 176Amps. He says I need to calculate the current as the 3 Phase Load (139Amps) plus the Single Phase load (37Amps). I argued that since the (2) single phase loads would be wired on A,B,C,A, that should not matter.
What gives? If this is the case, I've sized feeders, panelboards, everything incorrectly for 6 years!
What gives? If this is the case, I've sized feeders, panelboards, everything incorrectly for 6 years!