All by Owner Utility not involved.
2500 KVA 13.8 Pri. 480/277 Sec.
Transformer outside Bldg. Switchgear inside.
Switchgear Must be service rated.(225.36)
Question ?? Since transformers a 480/277 Volt sec.
Can Switchgear be Straight 480 volt with Ground??
I say since its a Y grounded system , A Neutral must be brought to the Ist Switch as required in 250.24(C).
Otherwise you have Y transformer Delta Gear.
This would not apply past ist Switch.
Neutral required for proper grounding at ist switch only.
I've looked at several Forums & articles .
I know the Neutral is not used for any other purpose then grounding.
If straight 480 v Gear put in on Switchgear. Nameplate would read 480 v 3 wire / Transformer would read 480/277 v 4 wire.
Again this would only apply to ist switch entering the building. Past that 3 hots Gr. OK.
Yoopersup
