Isolated ground wire

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anbm

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Designer
Can we run isolated ground wire in a separate conduit from other wires?

The question came up because we want to feed a new xray equipment from an existing panel 'A' (not service entrance board), and the vendor drawing calls for an isolated ground wire to be run from new xray equipment back to building grounding system.

In order to do this, we have to run isolated ground with other wires in same conduit and back to building main service entrance board...which requires to increase existing conduit between panel 'A' and upstream boards as well as shutdown panel 'A' some hours to re-pull the new wires.
 
Also, does the isolated ground wire need to be color code identify? orange color label?
 
As for the color of your grounding conductor look at 250.19
As for the first question read all of Art. 250 VI. If your X-ray equipment is fed from a SDS (transformer) running an isolated ground past that to main building GEC doesn't make much sense to me ( unless you think it may get struck by lightning ) :D
 
The "isolated" EGC is the EGC for the circuit and 300.3(B) applies. It must be run with the circuit conductors. Where it is run upstream from the branch circuit OCPD it must be run with the feeder conductors that supply the branch circuit.
 
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