Does this Fitting Require a Bushing?

[Pierre C Belarge]

There are more reasons for the need of a bushing with PVC than first meets the eye. Take for instance the temperature rating of the PVC itself, it is not rated as high as some would think.

From Carlon's website.

" Does Carlon manufacture 105 C schedule 40 PVC?
We do not."



Take a look at this picture. You will see that the installation of the conductors has burned through the fitting. The bushings have a higher temperature, which reduces the damage that may be caused by just such an installation.
We all know just how sharp some of the 'burn-thru' situations just like the picture shows, can be. Hence the CMP has decided that bushings for PVC installations are a requirement.

 

[PetrosA]

I haven't ever seen a connector like that but it obviously doesn't facilitate the use of a bushing. The bushings they sell around here are also made of PVC as far as I can tell, and will burn through from pulling just as easily as a termad. For that reason I don't usually install them till after wires are pulled.

 

[Pierre C Belarge]

This is probably a raceway not many have seen too many times before.
And I do believe a fitting here is not necessary.

 

[iwire]

Take a look at this picture. You will see that the installation of the conductors has burned through the fitting. The bushings have a higher temperature, which reduces the damage that may be caused by just such an installation.


We all know just how sharp some of the 'burn-thru' situations just like the picture shows, can be. Hence the CMP has decided that bushings for PVC installations are a requirement.

The fitting in the picture is not required to have a bushing, it is designed to be used just as shown.

Here is one in 1/2" size, you place it throuh the KO and attach a coupling to the other side.

 

[LJSMITH1]

This fitting was damaged during the conductor pull. Enough friction was created between the conductor insulation and the PVC that it melted the PVC. The contractor should have used a roller or other method to prevent conductor contact with the inside edge of the PVC.


As for a fix, they could place a plastic insulator like this one inside and it should be fine.

http://www.bptfittings.com/Catalog/CatalogFamily.aspx?CategoryId=10&FamilyId=277&ShowReturn=true

 

[RB1]

The reference to 300.4(G) in 314.17 applies to all conductors entering boxes including cables. 408.2 makes this requirement applicable to panelboards. The jacket of the SE cable is not a substantial insulating material. It is at best a covering.

 

[electricmanscott]

The reference to 300.4(G) in 314.17 applies to all conductors entering boxes including cables. 408.2 makes this requirement applicable to panelboards. The jacket of the SE cable is not a substantial insulating material. It is at best a covering.

Se cable is not a raceway.

 

[M. D.]

The reference to 300.4(G) in 314.17 applies to all conductors entering boxes including cables. 408.2 makes this requirement applicable to panelboards. The jacket of the SE cable is not a substantial insulating material. It is at best a covering.

Not that I can see ,...

"Where raceways contain4 AWG....... and these conductors enter .... "

Which conductors? Those in a raceway...

 

[iwire]

Se cable is not a raceway.

Never was, never will be, no bushing required with cables.

 

[electricmanscott]

Never was, never will be, no bushing required with cables.

It seems that not everyone agrees.

 

[M. D.]

Pierre ,..Have you answered the question ,.. "does this fitting require a bushing?? ,.. yet ,.. I may have missed it .

 

[electricmanscott]

Pierre ,..Have you answered the question ,.. "does this fitting require a bushing?? ,.. yet ,.. I may have missed it .

That's going to be on page 17. Hang in there. :grin:

 

[dcspector]

That's going to be on page 17. Hang in there. :grin:

No kiddin and the answer is no for Se Connector and yes for PVC

 

[Dennis Alwon]

No kiddin and the answer is no for Se Connector and yes for PVC

Yes for PVC when using the standard connector not for the one in Pierre's picture. That is standard MO around here. They are esp. nice in boxes where you have big wires and need to bend them. You gain a little more that an inch with these slip fitting-- (my name for them)

 

[dcspector]

Yes for PVC when using the standard connector not for the one in Pierre's picture. That is standard MO around here. They are esp. nice in boxes where you have big wires and need to bend them. You gain a little more that an inch with these slip fitting-- (my name for them)

Dennis I had two answers and was not allowed to edit. I was on the phone here in the office and forgot to hit save.....No for SE connecter and yes for PVC....352.46 around here they use the bell at floor below open bottom equipment. We are on the same page.

 

[Pierre C Belarge]

I don't know, I see no 'personal preference thing' when inspectors make us do things that are well beyond code and add nothing to electrical safety.

Personal Preference Thing, definition:
"When an inspector wants what he wants when he wants it"

 

[mivey]

Personal Preference Thing, definition:
"When an inspector wants what he wants when he wants it"

But what about when he just gets what he needs?

It is said to be a Rolling Stones Thing. :grin:

 

[Electron_Sam78]

While I like to show a little more sheath,

I think I'm gonna blush :grin:

 

[peter d]

As if it wasn't obvious by now, this fitting does not require a bushing. Cable clamps never do.

 

[don_resqcapt19]

The code needs to be changed to either require a bushing for #4 or larger conductors or require that the sheath be inserted past the inside end of the cable connector. The potential for damage with a cable connector and an EMT connector is identical. If one needs protection they both do.