"Ground" for Fire Pump Feeder

[electrofelon]

See 230.72(A) Exception and 695.695.4(B)(3)(4).

Ok good catch on the 695.4(B)(3)(4) reference. The code could certainly be organized more clearly, but it appears the fire pump disconnect must be remote whether it is its own service or is connected to the building service.

 

[charlie b]

Guys, I am not talking about the "grounded" (i.e., neutral) wire. I am talking about one (I am not sure which one) that has "ground" in its title, but is not followed by "ed." Do I need a GEC, or an EGC (I am sure this is not it) or an SSBJ.

 

[augie47]

Guys, I am not talking about the "grounded" (i.e., neutral) wire. I am talking about one (I am not sure which one) that has "ground" in its title, but is not followed by "ed." Do I need a GEC, or an EGC (I am sure this is not it) or an SSBJ.

Sine you have "tapped" service conductors supplying the controller, the controller is a service disconnect ans as such is required to have a grounded conductor routed with the service conductors per 250.24(C). Even though you do not need it for it's "neutral/load" cabability it is still a grounded conductor and sized per 250.102 based on the accompanying phase conductors.

 

[charlie b]

Thanks, Gus. I know I need to bring a neutral. That does not address my question. Do I need to include an SSBJ?

 

[texie]

Thanks, Gus. I know I need to bring a neutral. That does not address my question. Do I need to include an SSBJ?

Charlie,
You don't need anything except maybe a SSBJ to ground any metallic items in the raceway path that must be bonded per 250.92. Even those items (if any) could be simply connected to the grounded conductor. An example that would need connection to the grounded conductor or a SSBJ would be a metallic 90 degree stub up that is connected to PVC underground. If you had PVC all the way you would not need anything. The metallic enclosures at each end will be bonded to the grounded conductor. This is no different than a regular service. See post #11.

 

[electrofelon]

Thanks, Gus. I know I need to bring a neutral. That does not address my question. Do I need to include an SSBJ?

The grounded conductor IS the bonding conductor at the service and things wired like a service. I can think of two reasons why one might want to bond something on the line side of the service disconnect with a SSBJ instead of directly to/with the grounded conductor:

1. When It is more convenient to use an SSBJ. Think multiple sets where it would be a hassle and require an expensive connector to bond directly to the grounded conductors, or perhaps a provided lug is not large enough. Or think of a bonding bushing where you would need to make a pretzel out of the grounded conductor to route it thru the BB lug.


2. To avoid creating a parallel path/objectionable current.

So long story short, if you ran a SSBJ it would be to a specific point doing something specific, you wouldn't just "run one" and have it doing nothing or being a parallel grounded conductor.