Plastic bushings ....

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Bushings are required when the wire within the conduit is #4 or larger or the conduit is rigid threaded conduit.
 
Take a look at XXX.46 in some of the raceway articles and 300.4(F)

300.4(F) Insulated Fittings. Where raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.
Exception: Where threaded hubs or bosses that are an integral part of a cabinet, box enclosure, or raceway provide a smoothly rounded or flared entry for conductors.

Conduit bushings constructed wholly of insulating material shall not be used to secure a fitting or raceway. The insulating fitting or insulating material shall have a temperature rating not less than the insulation temperature rating of the installed conductors.
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infinity said:
Bushings are required when the wire within the conduit is #4 or larger or the conduit is rigid threaded conduit.
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RGD conduit(metallic or non-Metallic) with #12 wires does or doesn't????????
 
I say no, Bob says yes. IMO the edge of the terminal adapter is just as smooth as the edge of an EMT connector. IMO neither require a bushing for conductors smaller than #4.
 
I had an inspector tell me once I needed a bushing on 4/0 ser cable

I disagreed as long as the outer sheathing went past the threads

He said he would let it slide

I didn't want him to "let it slide" i wanted to hear I was right
 
infinity said:
I say no, Bob says yes. IMO the edge of the terminal adapter is just as smooth as the edge of an EMT connector. IMO neither require a bushing for conductors smaller than #4.
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Well you would really be disappointed re-pulling your conductors if you came here to MA. :D


ARTICLE 352 Rigid Nonmetallic Conduit: Type RNC

352.46 Bushings.
Where a conduit enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the wire from abrasion unless the box, fitting, or enclosure design provides equivalent protection.

FPN:See 300.4(F) for the protection of conductors 4 AWG and larger at bushings.
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IMO the edge of the male terminal adapters we get are in fact much sharper than an EMT fitting, but that is not the only question.

"...unless the box, fitting, or enclosure design provides equivalent protection..."

They certainly do not provide equivalent protection of a bushing, you can't say a male terminal adapter is as smooth as a bushing.

That along with the low cost of including them, the high cost of installing them after and the fact I know some inspectors in this area require them it's a no brainier.

An official answer?

Only the inspector in your area can provide that.
 
I find it strange that the code says "--a bushing or adapter shall be used--"

but a male terminal adapter does not qualify as an adapter?

What other fitting would be called an adapter, I can't think of any!!

I guess " It says what it says " is not always true.
 
benaround said:
I find it strange that the code says "--a bushing or adapter shall be used--"

but a male terminal adapter does not qualify as an adapter?

What other fitting would be called an adapter, I can't think of any!!

I guess " It says what it says " is not always true.
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For PVC, there are "box adapters", "end bells, and "frabricated end bells".

http://www.carlon.com/Master%20Catalog/Conduit_Fittings_Schedule_40_and_80.pdf

Look on page 4 of the PDF or 177 of the cat.
 
Hardworkingstiff,

That's all good, but my point is the term 'adapter' is in 'male terminal adapter"

yet it still needs a bushing or adapter??

Maybe it should be called a 'male terminal connector". Semantics, I don't know
 
What if I use my pocket knife to ream the inside end of the PVC male adapter?
Bushing still needed....errrr...required?
steve
 
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