Bonding both ends of rigid metal conduit

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Isaiah

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Baton Rouge
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Electrical Inspector
I have a conduit routed from a 3ph disconnect switch to an above cable tray where the cable dumps into the tray. The metal conduit has a Myers hub at the disconnect end but is not bonded to the tray at the opposite end. Where in the NEC does it tell me this end has to be bonded to the tray?


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My understanding has been that if you rely on it for bonding the transition needs to incorporate an approved UL fitting such as B-Line 9ZN-1148 and no bond bush is required.
Since your conduit contains a wire type EGCand is terminated with a "Myers" hub I don't see the need for bonding at the tray but that's an opinion.
 
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augie47 said:
My understanding has been that if you rely on it for bonding the transition needs to incorporate an approved UL fitting such as B-Line 9ZN-1148 and no bond bush is required.
Since your conduit contains a wire type EGCand is terminated with a "Myers" hub I don't see the need for bonding at the tray but that's an opinion.
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Augie do you think there could be difference of potential between the conduit and the tray if it isn’t bonded at the tray also? Or would the myers hub at the disconnect suffice ?


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Isaiah said:
Augie do you think there could be difference of potential between the conduit and the tray if it isn’t bonded at the tray also? Or would the myers hub at the disconnect suffice ?


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Click to expand...
May I try to answer that. Augie can correct me. ( cause he's forgotten more then I know ;) )
No difference , because you have an equipment ground in the conduit which is bonded in the cable tray and on the side where the Myers hub is.
 
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