EGC run with circuit

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ron

ron

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An oddball request to me was that they wanted to run the phase and grounded conductor (30A circuit) from the panelboard to the disconnect. The EGC at the disconnect was to be derived from building steel, not the panelboard source. Then from the disconnect all three conductors (phase, grounded and EGC) on to the load.

Help with a code section because I think there is something stinky about this ....
 
I agree with Steve
250.136 Equipment Considered Effectively Grounded

Under the conditions specified in 250.136(A) and (B), the non?current-carrying metal parts of the equipment shall be considered effectively grounded.

(A) Equipment Secured to Grounded Metal Supports Electrical equipment secured to and in electrical contact with a metal rack or structure provided for its support and grounded by one of the means indicated in 250.134. The structural metal frame of a building shall not be used as the required equipment grounding conductor for ac equipment.
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Sounds like they're trying to create a supplementary grounding electrode for use as a signal reference ground. This is permitted but is not allowed as a replacement for the EGC.
 
Is the feed to the disconnect run through an approved EGC from 250.118?

You may not be deriving the ground from building steel after all.

In my experience where there's building steel there's conduit. They may not want to pull an EGC to the disconect for fill reasons.
 
I guess that is an oddball request then. Since now they don't want you to run an EGC at all to the disconect.

Maybe the ground got lost.



At the scrap yard. ;)

However I still say it could be code compliant per 250.134(A).

IMO if an EGC from 250.118 is run to the disconect in accordance with 250.120(A) that's your EGC. Running a wire EGC from the disconect to the utilization equipment would just be a continuation of the original.
 
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