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Mark, Separately derived is defined in article 100. Basically, a separately derived system has no common conductors other than possibly equipment ground. By the definition in article 100 the feeder from the house may be a separately derived system at the shop. It may not be if the house and shop are feed off of the same transformer because the two systems would both have a neutral connection at the transformer. The ac output of a grid interactive inverter with no batteries cannot be a separately derived system because it connects to conductors on the premises. There must be an equipment ground with the inverter output wires (feeder between house and shop). And the equipment ground needs to connect to the grounding system at both buildings. That does make a connection between the two grounding systems - just as happens whenever a feeder is run from a house to an outbuilding. Kent Osterberg Blue Mountain Solar Mark Frye wrote:
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