makoester1
Member
- Location
- Indiana
An industrial facility has installed an additional 12470V Delta-480V Wye transformer and secondary switchgear. The transformer and gear are BOTH located outside. A system bonding jumper is installed at both the transformer and secondary switchgear. Per 250.30(A)(1) exception 2, this is allowed if parallel paths for the grounded conductor are not created. PVC conduit was utilized between the transformer and switchgear. So far I believe this is NEC compliant. Where I believe it begins to very, is the location of the grounding electrode connection. The current installation has this connection at the switchgear instead of at the transformer. Per 250.30(C), this connection shall be made at the source for an outdoor separately derived system. Since both the transformer and switchgear are outside, does this present a problem? Should the grounding electrode connection be moved to the transformer? Should an additional grounding electrode connection be made at the transformer as well? If a grounding electrode connection is made at both locations on a common GES, would parallel paths come into play?
Thanks
Thanks