Service rated Transfer switch 480 V 3 phase.

Two feeds
One from Generator Breaker other from utility transformer (No breaker inbetween).

Both underground directly to transfer switch(service rated) Which has a breaker for Both incoming lines.

Generator feed is three phases plus Ground, Power co. feed I take it MUST be three phases plus Neutral. Even though neuutrals not to be used its required for grounding.
Thus you have an equipment Ground from Generator , AND a neutral from Power Co. Hooking to the same bar.& Neutral bar Must be tied to the case.
Any comments or Input???

Yoopers