Service bonding and grounding, is this to code?

[Adamg921]

I attached a drawing of a new service and wanted to know if this is up to code. Each nipple has a grounding bushing on one side. 2 of them are in the service disconnect and 1 in the meter. The disconnect and meter are bonded through the neutral correct?

 

[infinity]

Everything ahead of the service disconnect should be connected to the neutral including the tap box. Also you probably wont need the bonding jumper on the raceway on the load side of the service disconnect.

 

[Adamjamma]

Rob, the ground he shows on the tap box... that need moved to the service disconnect instead, doesn’t it? Otherwise it messes up the neutral setup?

in my own mind, all the green is not needed until you get to the service disconnect... but you need the grounding and bonding there... from the steel and the ground rod as well... unless the tap is being done after the service disconnect?

 

[LarryFine]

Yes, the EGC system begins at the main disco, and that is where the entire GEC system connects. The neutral should be what bonds everything upstream.

 

[ActionDave]

I attached a drawing of a new service and wanted to know if this is up to code. Each nipple has a grounding bushing on one side. 2 of them are in the service disconnect and 1 in the meter. The disconnect and meter are bonded through the neutral correct?

The green wire for the building steel needs to move up to the service disconnect.

 

[Adamg921]

Thanks for everyone's input thus far. Would moving the wire for the building steel and the GEC in the tap box to the neutral bar instead of the ground bar suffice? An inspector actually came through and passed it, however, I just wanted to make sure this wasn't creating a hazard or just missing something. Could i just bond whats in the tap box to neutral and remove the load side bonding jumper in the disconnect and be good?

 

[rojay]

I would think that if all the enclosures up to the service disconnect were bonded to the neutral as previously stated, you’d be fine as it is. Wouldn’t the panel ground at the top of the service disco be an EGC that could land at a separate EG bar or the neutral bar that is bonded to the disconnect by the MBJ?

 

[ActionDave]

Thanks for everyone's input thus far. Would moving the wire for the building steel and the GEC in the tap box to the neutral bar instead of the ground bar suffice? An inspector actually came through and passed it, however, I just wanted to make sure this wasn't creating a hazard or just missing something. Could i just bond whats in the tap box to neutral and remove the load side bonding jumper in the disconnect and be good?

Electrically everything is bonded together and the whole thing is one big blob of grounds and neutrals. NEC wise you bond your neutral and all your grounding electrode conductors in the service disconnect.

 

[rojay]

Electrically everything is bonded together and the whole thing is one big blob of grounds and neutrals. NEC wise you bond your neutral and all your grounding electrode conductors in the service disconnect.

Bonding neutrals and GEC’s at the service disconnect is definitely one way to comply with the NEC but doesn’t 250.24a1 give more than one option as to where the bonding can take place?

Maybe I missed some details, but is it possible that this is a 277/480 v system and the wire at the top (labeled as panel ground ) is an EGC and the jumper is a bonding jumper around some concentric/eccentric ko’s?

 

[Adamg921]

Rojay, it's a 120/208v 4 wire system. Also, that green wire to "panel ground" would be an EGC and those are bonding jumpers but the only concentric/eccentric knockouts used are on the meter going to the service. I just assumed all service conductor raceways required grounding bushings.

 

[rojay]

Rojay, it's a 120/208v 4 wire system. Also, that green wire to "panel ground" would be an EGC and those are bonding jumpers but the only concentric/eccentric knockouts used are on the meter going to the service. I just assumed all service conductor raceways required grounding bushings.

Ok, gotcha. Then you probably didn’t need the grounding bushing and jumper at the top because since the run to your panel is coming from the load side of your service disconnect it’s not really a service raceway but a feeder.