277 or 480 v eccentric, concentric bonding.

[reyamkram]

from what I understand, we use bonding busing around eccentric, concentric on the service side of 480 volts, what about the load side of the OCPD when I run
a feeder from the breaker to another disconnect or cut box that has eccentric, concentric knocks, do we use bonding busing??

I looked at 250.97 bonding for systems over 250 volts. what I read I did not see any thing saying about the load side of the OCPD.



Thank you, for any and all information.

Reyamkram.

 

[texie]

"Special" bonding is required on the line side of all services regardless of voltage or whether or not there are concentric KOs. See 250.92.
480/277 on the load side of a breaker needs bonding around if you have concentrics that are not specifically listed for grounding above 250 volt. Few are so rated but 4S boxes usually are.

 

[infinity]

Things like disconnect switches do not have concentric or eccentric KO's listed for bonding over 250 volts. For the 4" and 4 11/16" boxes we use they all do have such a listing.

 

[tom baker]

It’s easy to tell if you need a bond bushing. If the ko is easy to push out yes. If it requires a screwdriver and Klien “hammer” no.

 

[reyamkram]

"Special" bonding is required on the line side of all services regardless of voltage or whether or not there are concentric KOs. See 250.92.
480/277 on the load side of a breaker needs bonding around if you have concentrics that are not specifically listed for grounding above 250 volt. Few are so rated but 4S boxes usually are.

I do thank you all for your information, it is very helpful.