Hi fellow wrenches, We just inherited a two year old off grid system consisting of a separate home and a big shop/garage that has a mechanical room and battery room. The OBFW500 power center feeds a main/meter panel. The two Kohler generators (25kW LPG & 60kW Diesel) feed a transfer switch that feeds another meter/mains panel.
1. The previous electrician didn't run any grounding to the home with the two service feeds, where there are two separate AC load centers, A 200A main panel and a 100A subpanel for the overflow. both fed from the inverter meter/mains panel. We have installed the ground one. Now he is claiming "code requires separate grounds on detached buildings. 1. House and garage are not bonded together , they again have separate ground-rods as required." I flat can't find any reference to his statement in the code, and he didn't say where in the code he is referencing. I quoted NEC 250.50, 250.66 as my reason to correct the lack of grounding between buildings. Can anyone shed some light on this, thanks. Elsewhere I am removing redundant neutral to ground bonds in both the generators, the generator meter/main panel the home's 200A main panel, and leaving the one in the inverter meter/main as the one point of bonding. We grounded the generator chassis too. Sincerely, Chris Worcester Solar Wind Works NABCEP Certified PV Installer Phone: 530-582-4503 Fax: 530-582-4603 <http://www.solarwindworks.com/> www.solarwindworks.com <mailto:ch...@solarwindworks.com> ch...@solarwindworks.com "Proven Energy Solutions"
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