Bushing required?

[Copperclad]

Hi everyone!
Just wondering if any of you have ever heard of a NEC requirement that says 1" conduit and above must have an insulating bushing where it terminates into an enclosure? I have heard this all my apprentiship, but I can't seem to find it anywhere in the 2005 or 2008 NEC.
I see where a 4 awg and larger conductor requires bushings but nothing in refrence to raceway size....
Any help to clear this matter will be appreciated.

 

[chris kennedy]

Hi everyone!
Just wondering if any of you have ever heard of a NEC requirement that says 1" conduit and above must have an insulating bushing where it terminates into an enclosure? I have heard this all my apprentiship, but I can't seem to find it anywhere in the 2005 or 2008 NEC.
I see where a 4 awg and larger conductor requires bushings but nothing in refrence to raceway size....
Any help to clear this matter will be appreciated.

As yourself, all I see is 300.4(G).

 

[buddhakii]

I was told the same thing when I was an apprentice but I don't think that is correct unless it was before 05' code.

 

[Jake R. Laws]

What about 342.46, 344.46, 352.46 and 362.46

 

[chris kennedy]

What about 342.46, 344.46, 352.46 and 362.46

I love those articles!:smile: They all have a FPN that tells you to see 300.4(G).

 

[cowboyjwc]

Hi everyone!
Just wondering if any of you have ever heard of a NEC requirement that says 1" conduit and above must have an insulating bushing where it terminates into an enclosure? I have heard this all my apprentiship, but I can't seem to find it anywhere in the 2005 or 2008 NEC.
I see where a 4 awg and larger conductor requires bushings but nothing in refrence to raceway size....
Any help to clear this matter will be appreciated.

You are correct about the 4 awg requiring it. It's just one of those myths or rules of thumb that won't die. My guess is that it started because starting around #4 you would probably run 1" pipe. Thus 1" needs a bushing.

 

[augie47]

You are correct about the 4 awg requiring it. It's just one of those myths or rules of thumb that won't die. My guess is that it started because starting around #4 you would probably run 1" pipe. Thus 1" needs a bushing.

In one "move", I failed to bring some older NECs along. My memory is that at one time the reference was to conduit size.

 

[cowboyjwc]

In one "move", I failed to bring some older NECs along. My memory is that at one time the reference was to conduit size.

That could be true Gus, because like him I learned to put a bushing on 1", but I've only been in the trades since about '79 and I wasn't as worried about doing it to code as doing it the way the boss wanted. Maybe some of the older guys know.

 

[icesoft]

I just looked at 373.6c in the 1978 NEC and it only references 4 awg wire, no conduit size.

 

[Smart $]

What about 342.46, 344.46, 352.46 and 362.46

I love those articles!:smile: They all have a FPN that tells you to see 300.4(G).

Just for clarification, those articles require bushings or equivalent abrasion protection on basically all conduit terminations of the respective types, regardless of the FPN

 

[SEO]

I agree with Smart $.

 

[infinity]

Just for clarification, those articles require bushings or equivalent abrasion protection on basically all conduit terminations of the respective types, regardless of the FPN

Yup, the requirement is based on the size of the conductors not the conduit.

 

[Karl H]

What about 342.46, 344.46, 352.46 and 362.46

Those are very important articles to remember, "Bushings" are required.
I was also taught 1" and larger. Until I actually sat down and read my first
code book,back in the good ol'e days,when they were small and would fit
in your tool bag.

 

[buddhakii]

I use bushings on anything over 1" emt even though most 1 1/4" connectors probably don't require them unless you run #4 or larger. I put bushings on any rigid or and short nipples of any kind.

 

[Karl H]

I use bushings on anything over 1" emt even though most 1 1/4" connectors probably don't require them unless you run #4 or larger. I put bushings on any rigid or and short nipples of any kind.

Good for you! A quote from a very smart man is,"Minium Code Compliance
is a lawyer's Mercedes Benz."

 

[buddhakii]

Never said I do min. code compliance. I suppose your one of those guys that puts a bushing on 1/2" connectors.

 

[buddhakii]

I use bushings on anything over 1" emt even though most 1 1/4" connectors probably don't require them unless you run #4 or larger. I put bushings on any rigid or and short nipples of any kind.

Edit to add:I put them on 1" fittings and up.

 

[Karl H]

Never said I do min. code compliance. I suppose your one of those guys that puts a bushing on 1/2" connectors.

If I'm running ridgid I do,without threadless fittings of course. What do you do?

 

[Karl H]

Edit to add:I put them on 1" fittings and up.

I don't see a problem with that. Are you doing it out of habit or do you know
the rule and just decided 1" and up would be a safer install?

 

[Smart $]

Yup, the requirement is based on the size of the conductors not the conduit.

That's not a "comprehensive" statement. Raceway terminations of types noted by Article hereinbefore are required to have conductor abrasion protection regardless of wire size. If that protection is not integral by design, a bushing is required... even if the wires are smaller than #4 AWG.