Bonding Jumper line or load side of Neutral Disconnect

Status
Not open for further replies.
walton

walton

Member
Location
Sacramento, CA
We have a pump control panel that was delivered to us with the Main Bonding Jumper terminated on the line side of the Neutral Disconnect link. NEC 230.75 states that disconnecting means shall be required to disconnect the Service Grounded Conductor from the premise wiring. In this installation when the Neutral Disconnect is pulled and the Main Breaker is opened all premise wiring is not disconnected from the Service Conductors. The grounding system is still connected. Does this meet the NEC intent?
 
Last edited:
The Main Bonding Jumper is terminated on the service side (line side) of the Neutral Bus Disconnect link. I have asked the installer to move the termination to the load side but they are resisting.
 
walton said:
We have a pump control panel that was delivered to us with the Main Bonding Jumper terminated on the line side of the Neutral Disconnect link. NEC 230.75 states that disconnecting means shall be required to disconnect the Service Grounded Conductor from the premise wiring. In this installation when the Neutral Disconnect is pulled and the Main Breaker is opened all premise wiring is not disconnected from the Service Conductors. The grounding system is still connected. Does this meet the NEC intent?
Click to expand...

I'm not sure that I understand your question.
Could you give a little more info about the installation?
Why do you want to disconnect the grounded service conductor?

230.75 says that there must be a way to disconnect the grounded service conductor....not that it must be disconnected.
A simple pressure connector (set screw) meets this requirement.

steve
 
If the bonding jumper also contains a disconnect link, I see little problem with it being located on the line side of the neutral disconnect link. Yes, it would require two items to be removed, but isolation would be possible.
 
The rule says that you disconnect the grounded conductor from the premisis wiring system. That happens even when the main bonding jumper is on the line side of the neutral disconnect. There is nothing that says the premisis grounding conductors have to be disconnected from the service conductors.
 
That should qualify as the "question of the week". If it's on the line side do we not still meet the requirements of 230.75 in that the "premises wiring system" (such as equipment grounds etc) is not involved at that point. As long as the service conductors are presnet , I would think you would want the bond present. One reason it's sized per 250.66 is to cover service side faults.
Secondly, if it's a UL listed enclosure and that was the manufacturer install, I'd be inclined not to relocate it.
 
I'm not getting this. The rule states that you have to be able to disconnect the grounded conductor, and that's why there is a grounded set screw buss bar in main disconnects. But beyond that, why would you ever want to disconnect the grounded conductor? Same with the EGC.
 
grantcool said:
I'm not getting this. The rule states that you have to be able to disconnect the grounded conductor, and that's why there is a grounded set screw buss bar in main disconnects. But beyond that, why would you ever want to disconnect the grounded conductor? Same with the EGC.
Click to expand...

Some tests require these conductors to be disconnected.
 
Thanks for the input. I have received information from a few manufactures of service panels that the Main Bonding Jumper should be landed on the line side of the Neutral Disconnect Link. I guess 250.24 (A)(5) is the answer. My confusion was inpart caused by the wording of 230.75 "disconnect from premise wiring". Now I must assume that the "premise wiring" does not include the grounding conductor system.
 
Status
Not open for further replies.
Top