Bonding Service Equipment

Status
Not open for further replies.
W

Will Wire

Senior Member
Location
California: NEC 2020
Occupation
Electrical Contractor
I recently worked on a multiple service. Each individual service enclosure is bonded to its grounded service conductor within the enclosure. The gutter is bonded to the center enclosure with a bonding jumper connected to a bonding locknut. The service enclosures to the right and left of the center enclosure are connected to the gutter with regular locknuts. Is this code compliant with 250.92 or was I required to use a bonding locknuts to connect the gutter to all three services. Individual punched holes no concentric knockouts. Thank you for your help, Trent
 
Last edited:
All metallic raceways on the line side of the service disconnect(s) require bonding beyond that of regular locknuts.
 
t-bird said:
Why is that a violation? It is a single Service drop supplying three services tapped in the gutter.
Click to expand...

Oh I see.

At first read I was thinking multi panel boards on same service each bonded to their neutral conductors.

My bad. Carry on :roll:

That means I walk back my statement about regular locknuts as well.
 
Thank you Infinity thats what i thought after reading up on it before my post. Since it is already installed, I can use bonding wedges on the other two panels to make it code compliant. Correct?
 
t-bird said:
Thank you Infinity thats what i thought after reading up on it before my post. Since it is already installed, I can use bonding wedges on the other two panels to make it code compliant. Correct?
Click to expand...

Yes a bonding wedge, bonding locknut or bonding bushing will work. Since you already have conductors in the conduit then a wedge is fine. They also make bonding locknuts that are hinged to go around existing raceways with conductors in them.
 
t-bird said:
Why is that a violation? It is a single Service drop supplying three services tapped in the gutter.
Click to expand...

Correction - it is one service that has three disconnecting means in separate enclosures. You are not permitted to have more then one service (in general) but can have up to six disconnecting means for the one service.

Exceptions to more then one service is situations with different voltages, frequency, number of phases, larger service needed then the utility can/will provide with one service ...
Exceptions to the six disconnecting means can be when you have things like emergency systems, fire pumps...
 
Status
Not open for further replies.
Top