Lets see if I understand this ist.
the 200amp is the source of all power right.480/277 Wye Service.
This feeds two 100amp Disconnect switches:
#1 Straight 480V three phase with ground out to external Bld.
#2 to 75kva 480v to 120/208 three phase 4 wire I take it that feeds a 200 amp panel.\
Is there breakers in the 480/277 v panel to the two hundred amp disconnect switches??
Do you have a main on the Load side of the 75KVA panel.
Little more Detail if you can
The 75KVA transformer & Panel After it come Come off 250.30
The Ground there and bonding is either at the transformer OR panel after it but not both (250.30(A)1
The service 120/208 volt single phase coming off the transformer disconnect I'm a little confused there???
Do mean the load side of the 75KVA (thats only 208v in pic.
Prehaps thats a Straight single phase 480Volt 75Kva to 120/240V secondary????
Little more info OK .
Yoopersup
