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rob, thanks for that link. I compared the design and they look similar to the diagram (4P). However, since four wire is going to the load which in this case is a 3W CB. What happens to the neutral?

waross, my situation has no transformer. Utility service is 480/277V. The neutral is designed to switch, but it is feeding a 3ph 3w breaker. what should happen to the neutral.

this is a 480/277V system. The existing circuit breaker after the proposed ats is 3 wire. What do you mean by "never left the service panel"?

everything is in one building. So does this calls for grounding the neutral after the ATS? How about the GFCI breaker, will it trip?

Hello, I need some help on an electrical problem as I am clueless. I want to verify the design. The current situation has an generator and utility feeding an ATS 1200A 4P (switching neutral). The load is an 1200A 3P circuit breaker (existing). What should happen to the neutral when...