Bond bushing question

[CaseyIEC]

Does a bonding bushing on a GRC nipple entering a meter enclosure bond the actual enclosure? Failed an inspection because of this. Denver wants just a bonding bushing there at the nipple and they want the manufacturers neutral bond removed, another municipality wants it another way: jumper to the actual can. And now Im charged for another reinspection.

 

[augie47]

The meter socket, any metallic service conduit and the service panel must be bonded.
The meter socket is normally automatically boned to the neutral by the manufacturer and he service panel is bonded by the MBJ required by 250.24.
Any metal conduit would need to be bonded per 250.92.

If Denver wants the MGJ removed from a service panel they would need a Code amendment.

 

[electrofelon]

. Denver wants just a bonding bushing there at the nipple and they want the manufacturers neutral bond removed,

Thats dumb, how do you even do that on most residential meter sockets?? Where does the jumper on the bonding bushing go?

 

[infinity]

The nipple requires bonding with more than a standard locknut because it contains service conductors. Bonding bushings are only one of a few acceptable bonding methods.

 

[suemarkp]

What are they trying to accomplish and what is at the other end of the conduit? Is the other end bonded? Are they trying to eliminate a parallel neutral path along the service conduit? Can you use non metallic conduit and eliminate the issue?

 

[infinity]

and they want the manufacturers neutral bond removed

On what planet would someone want the factory bonding connection removed?

 

[hillbilly1]

Is this a multiple meter installation? A main ahead of multiple meters? Maybe that’s why the inspector wants the neutral unbonded? Here, Georgia Power would tell the inspector to. They don’t allow EGC’s or GEC’s inside their metering enclosures. They do their own bonding if needed.

 

[Carultch]

On what planet would someone want the factory bonding connection removed?

Cold-sequence meter
Customer-owned meter
Distributed-generation production meter

Any meter that is load-side of the service disconnect, would require an isolated neutral, if the meter has a jaw for the neutral connection. I.e. 5-jaw and 7-jaw metering, as opposed to 4-jaw metering of split phase.

 

[infinity]

Cold-sequence meter
Customer-owned meter
Distributed-generation production meter

Any meter that is load-side of the service disconnect, would require an isolated neutral, if the meter has a jaw for the neutral connection. I.e. 5-jaw and 7-jaw metering, as opposed to 4-jaw metering of split phase.

I should have been more clear in saying that I was referring to the OP which made no mention of the scenarios in your post. With a typical 200 amp meter pan I don't even know how you can "unbond" the neutral where it is factory bolted to the enclosure.

 

[hillbilly1]

I should have been more clear in saying that I was referring to the OP which made no mention of the scenarios in your post. With a typical 200 amp meter pan I don't even know how you can "unbond" the neutral where it is factory bolted to the enclosure.

I suppose you could Polaris lug it straight through, but the poco would not like it, and they have jurisdiction in the meter can.

 

[tortuga]

Does a bonding bushing on a GRC nipple entering a meter enclosure bond the actual enclosure?

On the line side of a service disconnect I'd say the bushings job is to bond the raceway to the Neutral [per 250.92] creating a low impedance fault path.


Please post of photo of the installation that failed and what code section the inspector cited.

 

[infinity]

On the line side of a service disconnect I'd say the bushings job is to bond the raceway to the Neutral [per 250.92] creating a low impedance fault path.

That is correct and since you're only bonding the raceway the bonding jumper is only required on one side of the raceway.

 

[tortuga]

A thing I see on old underground services here is they pulled the neutral thru the meter can and ran a #4 back to bond the can and the rigid service lateral conduit from the utility with a bond bushing but not the chase between the panel and the can.
Back then the meter cans were quite small so they had reason to save wire bending space.

 

[electrofelon]

Does a bonding bushing on a GRC nipple entering a meter enclosure bond the actual enclosure?

On the line side of a service disconnect I'd say the bushings job is to bond the raceway to the Neutral [per 250.92] creating a low impedance fault path.

I would say in the vast majority of cases, the BB is to bond the raceway, but it does depend on the layout. I do not believe there is anything prohibiting you from using the a nipple/raceway as part of the bonding path and continuing it with bonding bushings. For example, say I have a nipple between two boxes. On the left side, there is bonding jumper from the grounded conductor to the box, and a bonding jumper to a BB on the nipple. Then on the right side, there is a BB with a jumper landing on the box to service bond that box.