Building A has a service w/GEC's, and a feeder is run from building B to building A (re; subpanel)

~does said subpanel need a GEC if the building already has one?

~if so, should GEC's from different x-formers be married together?

Quote
250.32 Two or More Buildings or Structures Supplied from a Common Service.

(A) Grounding Electrode. Where two or more buildings or structures are supplied from a common ac service by a feeder(s) or branch circuit(s), the grounding electrode(s) required in Part III of this article at each building or structure shall be connected in the manner specified in 250.32(B) or (C). Where there are no existing grounding electrodes, the grounding electrode(s) required in Part III of this article shall be installed.


[This message has been edited by sparky (edited 07-01-2003).]