13.2kv to 480/277V transformer grounding

[hhsting]

I can find in NEC 2017 Exhibit 250.15 Handbook show 489V to 208/120V transformer grounding detail. Is their anywhere I can find such transformer grounding detail for 13.2kv to 480/277V delta to wye transformer grounding detail? Even if its outside NEC somewhere

 

[ron]

It is exactly the same. Still a separately derived source