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Grounding ATS for Entire Bldg

Grounding ATS for Entire Bldg

Grounding ATS for Entire Bldg

(OP)
Adding a generator to serve the entire load of a building.  The intent is to intercept the underground service (multiple sets of 3 hots & grounded neutral in PVC ductbank) between the utility padmount transformer and the switchboard inside the building and install an ATS oudoors.  This ATS will have a weatherproof enclosure and an integral breaker on the normal side.  Does the ATS now become a "service", requiring the neutral to be connected to ground at this point?  If so, then the existing service conductors now are lacking a separate ground wire and not practical to add one.  Or, can the "service point" still be considered to be in the existing switchboard allowing the 4 wire service to remain as is and having no neutral to ground connection at the ATS.  The existing switchboard is 480Y/277V and over 1000A so it does have GFP on main breaker.

RE: Grounding ATS for Entire Bldg

Nope, your new ATS is your new service.  Anyway it is if the NEC is your governing code.

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