grounding a conduit

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wexley

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I have installed a 3" conduit to supply a panel. It starts from the swith gear with the 1st 90 and 12" of conduit imbeaded it concrete. i had to use a short section of flex to enter the panel. My question is do i have to use grounding bushing on the supply side. i am not using concentric knock outs. Inpector says due to the fact i have used flex and its over 20 amps i must use grounding bushings. I cannot find it in the code.
 
as far as the flex is concerned, he is correct (NEC 250.118{7}).
I [personally don't see where a bonding bushing would help, perhaps someone else does.
If he is concerned about bonding the conduit, I would think you would need a seperate means such as a pipe clamp & bond jumper.
 
augie47 said:
as far as the flex is concerned, he is correct (NEC 250.118{7}).
I [personally don't see where a bonding bushing would help, perhaps someone else does.
If he is concerned about bonding the conduit, I would think you would need a seperate means such as a pipe clamp & bond jumper.
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I agree, since the flex does not qualify as an EGC installing a bonding bushing with a jumper will accomplish nothing. The flex connector is already bonded with the locknut. An external bonding means should be used.
 
infinity said:
I agree, since the flex does not qualify as an EGC installing a bonding bushing with a jumper will accomplish nothing. The flex connector is already bonded with the locknut. An external bonding means should be used.
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I also see it this way.
 
Greg. It is, of course , possible that I'm looking at it incorrectly, but 250.96 requires metallic conduits be bonded. The flex would not be a recognized means to provide this on circuits greater than 20 amps so another method, such as an external bonding jumper, would be required (IMHO).
 
What if a separate EGC is pulled and there is no flex at the other end? Is there anything that says a conduit can't be bonded at its load end?
 
LarryFine said:
What if a separate EGC is pulled and there is no flex at the other end? Is there anything that says a conduit can't be bonded at its load end?
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not that I am aware.
from the original post it sounded to me like the run was non-metallic after the " 12" of conduit imbeaded it concrete." but that was an assumption on my part.
 
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