ecole
Member
- Location
- Washington, DC
- Occupation
- Project Manager
Hello everyone, I've been pounding my head in various handbooks, but I'm looking for some help with interpretation.
-I've been struggling to determine if 2 bond bushings are required on a task for a bit. We've run a conduit from the electrical room, down a tunnel space about 30 feet and then the 4/0 is freely mounted to the concrete surface.
-Both ends of this conduit lack a termination. Side A stops 6" or so away from a ground bar in the electrical room, where the 4/0 is bonded, and we have installed a bond bushing with solid #6 to bond the RMC to the GEC on this end. End B, stops no where in particular under the platform, so that the 4/0 can then be periodically cad welded to a #6 jumper that bonds our boxes.
-The RMC exists in this instance exclusively to protect the 4/0 from potential physical damage. The only thing in the RMC is our 4/0.
-Is a bond bushing in this instance required on both ends of the RMC in question? I've been back and forth between 250.64(E) and 250.86 with a few co-workers with no conclusion. Thanks for any help on this in advance.
-I've been struggling to determine if 2 bond bushings are required on a task for a bit. We've run a conduit from the electrical room, down a tunnel space about 30 feet and then the 4/0 is freely mounted to the concrete surface.
-Both ends of this conduit lack a termination. Side A stops 6" or so away from a ground bar in the electrical room, where the 4/0 is bonded, and we have installed a bond bushing with solid #6 to bond the RMC to the GEC on this end. End B, stops no where in particular under the platform, so that the 4/0 can then be periodically cad welded to a #6 jumper that bonds our boxes.
-The RMC exists in this instance exclusively to protect the 4/0 from potential physical damage. The only thing in the RMC is our 4/0.
-Is a bond bushing in this instance required on both ends of the RMC in question? I've been back and forth between 250.64(E) and 250.86 with a few co-workers with no conclusion. Thanks for any help on this in advance.