[electraman87]

I am working on a 5 story building. We are feeding( these are feeders on a 600A Breaker) each floor via feed through(panel to panel) from floor to floor. We are punching our own 3 1/2 inch hole's. Do we need bond bushings?:001_huh:
We are having much disagreement about this subject and can't find it anywhere in NEC

 

[McClary’s Electrical]

These sound like feeders to me. Not service conductors.

 

[dronai]

Only if you have concentric KO's,


so I say no

 

[McClary’s Electrical]

Only if you have concentric KO's,

so I say no

He didn't tell us enough details for your first statement to be true.

 

[electraman87]

bonding /ground bushings

these are feeders not service entrance conductors.
Any help would be greatly appreciated !!