XP Couplings and conduit fill

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naplespete57

naplespete57

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Project Manager in Conveyor Industry
Ran into a different one on my jobsite this week. Perhaps someone can help me out.

Would the conduit fill for an XP coupling fall under the rigid conduit tables? Are they separately listed in the code?
If I have a flexible coupling less than 18" may I use the 60% column?
I'm pretty sure that no bonding wire is needed, is that correct?

Thanks alot!

Pete
 
naplespete57 said:
Ran into a different one on my jobsite this week. Perhaps someone can help me out.

Would the conduit fill for an XP coupling fall under the rigid conduit tables? Are they separately listed in the code?
If I have a flexible coupling less than 18" may I use the 60% column?
I'm pretty sure that no bonding wire is needed, is that correct?

Thanks alot!

Pete
Click to expand...
These are all very good questions.

The ?fill? for explosionproof fittings, except for conventional seals, is based on RMC of the same trade size. (Conventional seals are limited to 25% fill for the trade same size.) See 501.15(C)(6).

A flexible metal coupling is not a nipple.

A flexible metal coupling is suitable as a grounding conductor.
 
Pete,
I am assuming that you are asking about Class I, Div 1 flexible conduit. If so, I am not aware of any code section that covers the wire fill. I did not check any catalogs to see of the manufacturer lists a wire fill. If you are asking about the 60% fill, can I assume that you are using the flexible conduit as a nipple between two enclosures?
 
don_resqcapt19 said:
Pete,
I am assuming that you are asking about Class I, Div 1 flexible conduit. If so, I am not aware of any code section that covers the wire fill. I did not check any catalogs to see of the manufacturer lists a wire fill. If you are asking about the 60% fill, can I assume that you are using the flexible conduit as a nipple between two enclosures?
Click to expand...
Tag, you're it Don.
 
More info

More info

Customer has SO cord hanging from ceiling to motor peckerhead. Machine does not move so it needs to be replaced with hard pipe and XP flexible coupling. I wanted to get the smallest XP coupling I could to do the job. If I could consider it a nipple I could put the #3 thhn in 12" of 3/4 xp flexible coupling. However if I go with 3 conductors and a ground the size would need to be 1 1/4" Big cost difference.

Thanks

Pete
 
Since the application is for vibration rather than major movement, I probably wouldn’t have too much objection if I actually saw the final installation in operation. The problem is that nipples are listed in the same UL product category as their primary conduit (DYIX for RMC, for example). The flexible metal couplings are an entirely different product category (EBNV). Chapter 9, Table 1, Note 4 specifically cites nipples, so you would be skirting 110.3(B).
 
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