ECN Forum Forums Code Related Discussion NEC & other Code issues grounding and bonding 480/120/240 transformer

I take it if I;m reading you correctly . You have a 480 volt ungrounded Delta.
Your adding a 120/240 v high leg Delta via a transformer.
Hope I;m right so far.
Question Case & (Net)??
Load side I;d say XO to lug on case , also XO sized by 250.66 . To grounding electrode as required by 250.30.
Ground & Neutral seperate as you stated in 120/240 volt panel.
I usually tie the Equipment ground coming in on the 480 side to the same bar or lug( on the case) as XO's tied to in the Transformer.
Thats the way I see it.
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