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The IG circuit originates from a IG terminal that is bonded to the neutral at the service Main OCPD.

Great, I only asked because it sounded like you where unfamiliar with IGs and many people think think an IG must run to a separate ground rod that is isolated from the buildings grounding electrode system.

Do not be offended, being unfamiliar with something has nothing to do with your abilities. [Linked Image]

I am very unfamiliar with hazardous locations, but IGs I work with all the time. [Linked Image]

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts