chuck@apsinc.biz
Member
- Location
- Colorado
NEC 250.28- Each service-disconnect shall have a main bonding jumper.
NEC 250.58- Where separate services supply a building and are required to be connected to a grounding electrode, the same grounding electrode shall be used.
I am working on an industrial project, where 2-services provide power for one structure. The (2)transformers and (2)Main disconnects are approximatly 400LF from the distribution boards with-in the structure. Equipment grounding conductors have been installed with each feeder.
I am pretty sure I need to provide 1-grounding electrode system at the structure and bond only the equipment grounding bus from each distribution board to the electrode.(NO neutral-to-ground bonds.)
I know I have to provide main bonding jumpers in each main disconnect(neutral-to-ground connection), however I am totally lost as to weather to provide (2) separate grounding electrode systems at the main-disconnects(One for each system) or if I need to provide (1)grounding electode and bond both systems to it?
My gut says that if I combine the systems at the main disconnects I am creating "objectional current" paths with-in the system. Can anyone point me in the right direction?
NEC 250.58- Where separate services supply a building and are required to be connected to a grounding electrode, the same grounding electrode shall be used.
I am working on an industrial project, where 2-services provide power for one structure. The (2)transformers and (2)Main disconnects are approximatly 400LF from the distribution boards with-in the structure. Equipment grounding conductors have been installed with each feeder.
I am pretty sure I need to provide 1-grounding electrode system at the structure and bond only the equipment grounding bus from each distribution board to the electrode.(NO neutral-to-ground bonds.)
I know I have to provide main bonding jumpers in each main disconnect(neutral-to-ground connection), however I am totally lost as to weather to provide (2) separate grounding electrode systems at the main-disconnects(One for each system) or if I need to provide (1)grounding electode and bond both systems to it?
My gut says that if I combine the systems at the main disconnects I am creating "objectional current" paths with-in the system. Can anyone point me in the right direction?