Grounding Xfrmr

[Alwayslearningelec]

I am replacing about (10) 45 and 75kva xfrms. Within electrical closets. There are no grounding details just a note to ground per NEC 250. This is very vague and not sure how to approach pricing up grounding. I guess I can take to a ground bar in the room or building steel in the room? Since there are not detail I would qualify grounding limited to the room and not beyond.

 

[roger]

250.30

 

[Strathead]

I am replacing about (10) 45 and 75kva xfrms. Within electrical closets. There are no grounding details just a note to ground per NEC 250. This is very vague and not sure how to approach pricing up grounding. I guess I can take to a ground bar in the room or building steel in the room? Since there are not detail I would qualify grounding limited to the room and not beyond.

Since you are replacing transformers, why wouldn't your clarification be "reuse existing ground only."

 

[infinity]

Is this a steel famed building? If so just run the GEC's to the nearest building steel. If all 10 transformers are in the same room you could install a ground bar.

 

[don_resqcapt19]

I am replacing about (10) 45 and 75kva xfrms. Within electrical closets. There are no grounding details just a note to ground per NEC 250. This is very vague and not sure how to approach pricing up grounding. I guess I can take to a ground bar in the room or building steel in the room? Since there are not detail I would qualify grounding limited to the room and not beyond.

The reference to Article 250 will require you to provide a connection to a grounding electrode per the requirements for separately derived systems...250.30