grounding bushing

[NicholasA]

480 volt 3phase from switch gear breaker to main disconnect on outside of building, from disconnect to MCC ran with pvc jacketed mc cable. Is a bonding bushing required from disconnect to MCC and/or the main disconnect on building.

 

[augie47]

Check 250.97. If concentric or eccentric knockouts are not encountered, 480v circuits on the load side of overcurrrent devices do not normally required bond bushings.

 

[ActionDave]

I agree with Augie. I might add that if concentric ko's are approved in the product listing for 480V then a bond bushing is not required either.