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.
grounding a conduit
- Thread starter wexley
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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.
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.
dcspector
Senior Member
- Location
- Burke, Virginia
250.118 (7) is for using FMC as an EGC not a bond bushing. What is the voltage and is this raceway for SE conductors?
dcspector
Senior Member
- Location
- Burke, Virginia
So I guess we are looking at 250.96
- Location
- New Jersey
- Occupation
- Journeyman Electrician
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.
- Location
- Massachusetts
I also see it this way.
dcspector
Senior Member
- Location
- Burke, Virginia
Did the OP say they did not install an EGC? Or am I confused?:-?
dcspector
Senior Member
- Location
- Burke, Virginia
Gus I am now totally confused......:-?:-?:-?
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).
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
How is the conduit bonded on the other end?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
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?
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.
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Scary, ain't it? :smile:Great minds think alike. (and so do minds like ours)
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
I understood it this way until this post, then I read it again and realize the OP did not say so.
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