Separately derived system and electrode?

[dm9289]

My situation has a 4000amp 480/277V system building main is switch gear.
Switch gear cabinet has large molded case breaker that feeds a fused disconnect.
Fuse disconnect has 4 wires 3 ungrounded conductors an a ground wire.
Fused disconnect goes in rigid conduit under cement for about 80 ft and emerges out of concrete to a wireway.
In wireway conductors are tapped to feed a transformer 480/240-120 single phase.
Two hots are tapped from 480 feed for xfrmr input and incoming ground wire from fused disconnect is ran to XO
240/120 output of transformer is connected with 2 hots and the neutral and ground to XO going to 120/240 panel neutral neutral bar ground to ground bar
Does this require a grounding electrode local to the transformer to attach to the XO such as building steel or rods.

 

[augie47]

IMO, 250.121 Exception would allow the grounding conductor to serve as a GEC IF it is properly sized and properly installed (keep 250.64 in mind).
250.104(D) would stil require bonding in the area served by the SDS {See Info Note at 250.30(A)(4)}

 

[dm9289]

IMO, 250.121 Exception would allow the grounding conductor to serve as a GEC IF it is properly sized and properly installed (keep 250.64 in mind).
250.104(D) would stil require bonding in the area served by the SDS {See Info Note at 250.30(A)(4)}

Thanks for the input. I will read thru the references