GEC inside EMT

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Old 07-08-19, 10:48 AM
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GEC inside EMT

My meter pan runs a conductor through EMT to the grounding electrode. But, its apparently a bad idea to leave the one end of the conductor NOT bonded to the end of the EMT. Due to additional inductance of the run. This is a lightning critical install, near a radio tower. So, is there a fitting for the end of the EMT to clamp or otherwise bond the #4 Cu conductor to? I think I have seen NM clamps that might work, but I don't treat those as a bonding device. Failing that, I suppose the next move is replace with PVC.

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Old 07-08-19, 12:09 PM
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Replace with PVC is usually my preferred option. But if you were to keep the EMT I would put a compression type box connector on the end of the EMT and thread a bonding bushing onto that. I haven't done a GEC in metal pipe in a while, but IIRC NEC also requires a bonding bushing on the box side of the pipe as well as on the open side.
 
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Old 07-09-19, 09:34 AM
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IIRC NEC also requires a bonding bushing on the box side of the pipe as well as on the open side.

Yes, when in a metallic conduit the GEC must be bonded to both ends of the metallic conduit.


So, is there a fitting for the end of the EMT to clamp or otherwise bond the #4 Cu conductor to?

The #4 Cu conductor is fine, but a #6 copper conductor is all that is required.
 
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