250.24(A)(2)

[Santiago]

This section allows the grounded conductor to be bonded at two locations, one at the utility's outdoor transformer and the second at the service disconnecting means of my building.

Now if my utility is providing me with a medium voltage (primary voltage) service,and I then distribute it through out the site and step it down to 480/277V Y at each of the many buildings in my site, is it a code violation to bond the neutral at the transformer AND at the building disconnect? (it will basically be the same as if the utility provided me with a 480/277V Y service directly to my building)

 

[petersonra]

This section allows the grounded conductor to be bonded at two locations, one at the utility's outdoor transformer and the second at the service disconnecting means of my building.

Now if my utility is providing me with a medium voltage (primary voltage) service,and I then distribute it through out the site and step it down to 480/277V Y at each of the many buildings in my site, is it a code violation to bond the neutral at the transformer AND at the building disconnect? (it will basically be the same as if the utility provided me with a 480/277V Y service directly to my building)

WOULDN'T YOUR XFMR BE AN SDS?

 

[augie47]

From what you say, I agree with petersonra that you have an SDS and not a "service" so your reference should be with 250.30 rather than 250.24.

Prior to the '11 Code, I would say that 250.30(A)(1) exception 2 would allow the GEC at the transformer and the 1st disconnecting means.

Quite frankly, I am confused by the '11 Code as the same exception is there, but, they have altered 250.30(A)(2) to require a supply side bonding jumper which would seem to defeat the exception.
Perhaps one of the more learned posters will clarify this for us.