Q This is an old question, but I would appreciate additional input. We have a utility main service, wye-wye pad-mounted transformer, three-phase, four-wire secondary with ground ring and four rods, ...

Per 250.190(B), when grounding a 5kV rated service disconnect operating at 4.16kV, what is the minimum size grounding electrode conductor for this service to connect the non-current metal parts of the ...