GEC mixed raceways

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jjdh

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Can you change the raceway protecting the GEC from Steel RMC to Aluminum LB to Steel RMC in a continuous length. How does the Bonding of the GEC to the Steel raceway at both ends work?

I think the answer is avoid this type installation.
 
jjdh said:
Can you change the raceway protecting the GEC from Steel RMC to Aluminum LB to Steel RMC in a continuous length. How does the Bonding of the GEC to the Steel raceway at both ends work?

I think the answer is avoid this type installation.
Click to expand...

Yes, you can use aluminum fitting with steel RMC in most locations (344.14).

A bonding bushing is threaded onto the male threads of the conduit or the tubing connector, having a lug that you can use to connect a jumper from the GEC to itself.
 
GEC mixed raceways

Volta said:
Yes, you can use aluminum fitting with steel RMC in most locations (344.14).

A bonding bushing is threaded onto the male threads of the conduit or the tubing connector, having a lug that you can use to connect a jumper from the GEC to itself.
Click to expand...

I reallise a bonding bushing is requred at b0th end of the steel conduit, but Is a bonding bushing required at both hubs of the aluminum LB?
 
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No, only at the termination points of the (electrically continuous) raceway. Bonding both ends will reduce the impedance of the steel conduit acting as a choke on the single conductor. The aluminum fitting will act as a fine section of conductor, and is effectively bonding each end of the ferrous sections.
 
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