AHJ wants me to bond at first panel

[Proeds]

Like the title says

I’m remodeling a hotel tower and have a 480 feed running up tower with no EGC. On floors 2, r, and 6 there are xfmrs stepping down to 120/208. I ran a seperate 3/0 GEC up the tower and set external ground bus bars on every floor there’s a xfmr.

Inspector wants me to bond in the first panelboard coming off of the xfmr. So do I just run a GEC off of the bus bars into the panelboard based on the main in that panelboard? Do I have to pull a ground with my secondary off of the xfmr to bond the xfmr shell?

I’ve never done it this way always bonded at XO on the XFMR. Appreciate any insight. Thanks

 

[augie47]

If you install you bonding jumper at the 1st panel you need to connect you grounding electrode conductor there also. It should be sized per 250.66 based on your transformer secondary conductors. A SSBJ need to be connected between the panel and the transformer however it can be the conduit if it qualifies under 250.118.
See 250-.30 for specifics

 

[infinity]

I’ve never done it this way always bonded at XO on the XFMR. Appreciate any insight. Thanks

Unless there is a local code amendment there is no requirement to bond the neutral within the panel. It can be either in the transformer or in the panel. If there isn't an amendment I would bond it at the transformer and tell the inspector that he's incorrect. It is a design issue not a code issue in doing your way. Your #3/0 is a common grounding electrode conductor {250.30(A)(6)} and is permitted the way you've installed it. As Augie mentioned the connection to the CGEC would be at the same point where the neutral is bonded via the SBJ.

 

[Proeds]

Unless there is a local code amendment there is no requirement to bond the neutral within the panel. It can be either in the transformer or in the panel. If there isn't an amendment I would bond it at the transformer and tell the inspector that he's incorrect. It is a design issue not a code issue in doing your way. Your #3/0 is a common grounding electrode conductor {250.30(A)(6)} and is permitted the way you've installed it. As Augie mentioned the connection to the CGEC would be at the same point where the neutral is bonded via the SBJ.

If you install you bonding jumper at the 1st panel you need to connect you grounding electrode conductor there also. It should be sized per 250.66 based on your transformer secondary conductors. A SSBJ need to be connected between the panel and the transformer however it can be the conduit if it qualifies under 250.118.
See 250-.30 for specifics

Thanks for the reply, so can I just land the ssbj on a ground bar that I mount (& scratch paint off) in the xfmr seperate of the neutral?