I am installing a new elevator controller on the top of a 23 story building that requires a dedicated equipment grounding conductor that will be run back to the service equipment location. Running this EGC, with the existing phase conductors is not possible without first removing them. The raceway is a 3 inch Rigid Galvanized Steel Conduit, and appears to be a good grounding path with no corrosion, and all fittings are tight.
I have a spare conduit that runs along this conduit that I would like to use.
This appears to be a code violation per Article 250, but I wonder if the CMP is referring to the service conductors, and not to an equipment ground.
I am aware that the impedance of the system may be higher if I do this.
Is this allowable?
[This message has been edited by Joe Tedesco (edited 05-21-2002).]
Joe Tedesco, NEC Consultant