EMT In Concrete Encased

[mstrlucky74]

Have conduit that's in a concrete encased ductbank(indoors) and doesn't specify RGS or EMT. Spec says threadless fitting are not permitted to be embedded in concrete. So I guess you have t use RGS. Agree?

 

[jumper]

Not necessarily. There are compression fittings for EMT that are listed for use in concrete.

https://platt.com/platt-electric-su...?SectionID=9&GroupID=127&xType=Concrete+Tight

 

[K8MHZ]

Not necessarily. There are compression fittings for EMT that are listed for use in concrete.

https://platt.com/platt-electric-su...?SectionID=9&GroupID=127&xType=Concrete+Tight

Just because they exist doesn't mean they are allowed by his specs. He could also use IMC.

 

[Ingenieur]

Weird spec
doesn't pvc fare better in concrete?
it's the most common method from what I've seen

spec says must be threaded
I guess a compression fitting has threads although the conduit is not threaded

 

[K8MHZ]

The spec may be in place to assure the conduit doesn't come apart during the pour, which with concrete pumps may be a concern.

 

[Ingenieur]

The spec may be in place to assure the conduit doesn't come apart during the pour, which with concrete pumps may be a concern.

A properly cemented and cured joint is pretty strong
plus the runs should be secured in place

 

[K8MHZ]

A properly cemented and cured joint is pretty strong
plus the runs should be secured in place

You are correct, I was talking about the differences in metallic conduit. Some jobs (like jails) don't allow any PVC.

 

[Strathead]

Not necessarily. There are compression fittings for EMT that are listed for use in concrete.

https://platt.com/platt-electric-su...?SectionID=9&GroupID=127&xType=Concrete+Tight

IMO a compression fitting is still threadless fitting in this application.

 

[infinity]

IMO a compression fitting is still threadless fitting in this application.

I agree, if you cannot use a threadless then you must use a thread.

 

[mstrlucky74]

Thanks.

 

[Strathead]

Have conduit that's in a concrete encased ductbank(indoors) and doesn't specify RGS or EMT. Spec says threadless fitting are not permitted to be embedded in concrete. So I guess you have t use RGS. Agree?

Along with other things, Schedule 80 PVC can be threaded. But I would generally assume RMC for bidding purposes unless I could get an answer. OR if I felt there might be review and price adjustment later, I would bid it with Schedule 80 and note it prominently in my proposal. It isn't worth losing money if you are forced to use RMC, but it might be the few dollars that gets you a second look.

 

[jumper]

IMO a compression fitting is still threadless fitting in this application.

I agree, if you cannot use a threadless then you must use a thread.

You guys are correct. Had a brain fade - saw threadless, but brain somehow went to set screw. Need more coffee.

 

[Carultch]

Along with other things, Schedule 80 PVC can be threaded. But I would generally assume RMC for bidding purposes unless I could get an answer. OR if I felt there might be review and price adjustment later, I would bid it with Schedule 80 and note it prominently in my proposal. It isn't worth losing money if you are forced to use RMC, but it might be the few dollars that gets you a second look.

Do there exist PVC couplings with female threads on both ends, that are listed for electrical applications?

 

[Strathead]

Do there exist PVC couplings with female threads on both ends, that are listed for electrical applications?

That I don't know, I just know the code references threading schedule 80. I have never done it.

 

[don_resqcapt19]

That I don't know, I just know the code references threading schedule 80. I have never done it.

There is no appearance of any variation of the word "thread" in Article 352.

 

[Strathead]

There is no appearance of any variation of the word "thread" in Article 352.

I apologize for being lazy. Many times I log things in my brain for future use and threading schedule 80 was something I have read about doing at some point. So I got lazy and referenced it. Further search looks like you can thread it because there is no direct prohibition, but why would you when you can just glue a fitting on it.