pvc raceways inside wall

[haitham]

hello ,

related to this picture View attachment 15764

i wanna ask about the right method of installing raceways ,conduits here Rigid pvc ,to be straight between boxes and changing direction by 90 degree ..or as a curve
which NEC article &section related to this case

 

[iwire]

I am 99% sure that is not NEC PVC raceway.

 

[haitham]

sure it may be...
the conduit is PVC type it is already in another country where there isn't AHJ ..the point im studying NEC and this a picture from the site and wanna connect it to NEC rules in specific distance between boxes , wiring method between boxes ...etc

 

[petersonra]

sure it may be...
the conduit is PVC type it is already in another country where there isn't AHJ ..the point im studying NEC and this a picture from the site and wanna connect it to NEC rules in specific distance between boxes , wiring method between boxes ...etc

In general you can embed PVC conduit in walls, if that is what you are asking. The picture you showed is not of NEC recognized PVC conduit.

The NEC allows it to be bent as you see fit as long as the bends do not exceed 360 degrees between pull points.

There are no NEC rules regarding distances between boxes.

All allowed wiring methods are covered in chapter 3 of the NEC, along with the limitations imposed on them. Single conductors in PVC conduit is one of the methods found in chapter 3.

 

[iwire]

sure it may be...
the conduit is PVC type it is already in another country where there isn't AHJ ..the point im studying NEC and this a picture from the site and wanna connect it to NEC rules in specific distance between boxes , wiring method between boxes ...etc

You called it rigid PVC, the raceway in the picture is not rigid PVC. In the NEC rigid PVC has a distinct set of rules.

In the picture that looks to be a flexible raceway of some type which would have different rules than a rigid raceway.

 

[haitham]

You called it rigid PVC, the raceway in the picture is not rigid PVC. In the NEC rigid PVC has a distinct set of rules.

In the picture that looks to be a flexible raceway of some type which would have different rules than a rigid raceway.

the required from the question is to study and to apply NEC rules ..
yes it isnt NEC raceway ,it is common pvc type in many countries.. yea it isn't rigid like rigid pvc
schedule 80 ,neither not flexible as u think it it not flexible such as FNC or even FMC ..anyway what i want to understand u mentioned it and it is bends not exceed 360 degree for all conduits between pull points , and there is table 2 ch 9 , and for each type there is table to determine allowed bending diameter for each conduit size ..here - ofcourse not in USA - they prefer the conduit to bend by 90 degree than to be curved as in the picture ,,but if i wanna apply NEC can i say both is ok cause bends don't exceed 360 degree ?
but for 352.24 bends made in such way not affect the internal diameter bending 90 degree in conduit will reduce the inner diameter ?
for table 2 ch 9 for any conduit table the bending diameter is always higher than the conduit diameter so can i say bending conduit by 90 degree is the wrong method ?

 

[jap]

the required from the question is to study and to apply NEC rules ..
yes it isnt NEC raceway ,it is common pvc type in many countries.. yea it isn't rigid like rigid pvc
schedule 80 ,neither not flexible as u think it it not flexible such as FNC or even FMC ..anyway what i want to understand u mentioned it and it is bends not exceed 360 degree for all conduits between pull points , and there is table 2 ch 9 , and for each type there is table to determine allowed bending diameter for each conduit size ..here - ofcourse not in USA - they prefer the conduit to bend by 90 degree than to be curved as in the picture ,,but if i wanna apply NEC can i say both is ok cause bends don't exceed 360 degree ?
but for 352.24 bends made in such way not affect the internal diameter bending 90 degree in conduit will reduce the inner diameter ?
for table 2 ch 9 for any conduit table the bending diameter is always higher than the conduit diameter so can i say bending conduit by 90 degree is the wrong method ?

I don't see how you can apply any NEC rule to a raceway that is not recognized by the NEC.

JAP>

 

[JFletcher]

That may be HDPE conduit:

http://plasticpipe.org/conduit/

which would be an article 353 install. I hope not, because 353.12(2) prohibits installing it in a building.

istm running RMC on the outside of the brick would have been a lot less time consuming that tearing up that wall and putting it back together.

All non-metallic raceways follow basically the same rules for bends, how they are made, number of bends between pull points, chamfering ragged ends, wire fill limits, etc. You also cannot operate the conductors within at a higher temperature than the raceway is designed for.

A large sweep bend like shown is fine.

 

[don_resqcapt19]

As long as you comply with the bending radius and do not damage the raceway, the NEC does not care how you install your bends. There is no requirement to be any specific number of degrees. Just a requirement that you do not exceed 360° between pull points. If you want to make 360 one degree bends or one 360 degree bend the NEC does not care.

 

[steve66]

I'd be a lot more concerned with the structural integrity of that wall than the bends in that conduit.

 

[haitham]

thank you

 

[haitham]

I'd be a lot more concerned with the structural integrity of that wall than the bends in that conduit.

:lol: it isn't of my work ,i just took it to study& understand some rules
it is common here to use this conduits not just in Egypt many countries ..they need to destroy the wall as u see
conduits install under floor or within ceiling and inside walls

 

[fmtjfw]

Look at the ENT rules (Smurf tube). Lots of other countries use a corrugated tube much like ENT.

 

[Cow]

It looks smooth on the outside to me, which makes me think it's HDPE. The same stuff phone companies buy in big reels.

Either way, I've never seen anyone remove brick like that to embed a raceway in the wall. Yikes!!

 

[haitham]

It looks smooth on the outside to me, which makes me think it's HDPE. The same stuff phone companies buy in big reels.

Either way, I've never seen anyone remove brick like that to embed a raceway in the wall. Yikes!!

you mean removing bricks in general or the in the images attached upper

they still using this method for installing conduits even for 3 and 5 million dollars villas !!

 

[mgookin]

you mean removing bricks in general or the in the images attached upper

they still using this method for installing conduits even for 3 and 5 million dollars villas !!

Are they going to lay some sawn brick to hide it or do they leave it like that?

FYI: IIRC the NEC requires that you maintain inside diameter on conduit when bending. In other words, if it kinks, take it out and try again. Having no experience with that kind of pipe I can't advise on best way to bend it without kinking it but we do in-house bending and use heat and a bending jig and get some pretty tight bends and they come out real nice. About 2:100 will kink and we just toss them out. That's usually caused by failure to heat it evenly.

 

[haitham]

Are they going to lay some sawn brick to hide it or do they leave it like that?

FYI: IIRC the NEC requires that you maintain inside diameter on conduit when bending. In other words, if it kinks, take it out and try again. Having no experience with that kind of pipe I can't advise on best way to bend it without kinking it but we do in-house bending and use heat and a bending jig and get some pretty tight bends and they come out real nice. About 2:100 will kink and we just toss them out. That's usually caused by failure to heat it evenly.

yea ofcourse after installing conduits they cover it and trenches in bricks along its length between boxes by concrete -cement and the entire walls as well then they Paint the walls with the required paint type and color ..
this type of conduits i find some manufacturers called it pliable PE , others produce the same shape ,color ,and the same application use but calling it PVC .. anyway thanks for your time

anyway can u give me a little about the difference between PVC schedule 80 and 40 and A -type and BE -PVC specially A and BE type just find them in tables in ch9 and annex c but nothing about them in ch3
thank you

 

[mgookin]

yea ofcourse after installing conduits they cover it and trenches in bricks along its length between boxes by concrete -cement and the entire walls as well then they Paint the walls with the required paint type and color ..
this type of conduits i find some manufacturers called it pliable PE , others produce the same shape ,color ,and the same application use but calling it PVC .. anyway thanks for your time

anyway can u give me a little about the difference between PVC schedule 80 and 40 and A -type and BE -PVC specially A and BE type just find them in tables in ch9 and annex c but nothing about them in ch3
thank you

I'm glad you clarified how the wall will be finished. From some of the comments it seems like some thought that was finished work.

As to specs and physical properties of those pipes, all of that is available on the internet. Search for "specifications (pipe type)" or "Physical properties of (pipe type)".

 

[JFletcher]

yea ofcourse after installing conduits they cover it and trenches in bricks along its length between boxes by concrete -cement and the entire walls as well then they Paint the walls with the required paint type and color ..
this type of conduits i find some manufacturers called it pliable PE , others produce the same shape ,color ,and the same application use but calling it PVC .. anyway thanks for your time

anyway can u give me a little about the difference between PVC schedule 80 and 40 and A -type and BE -PVC specially A and BE type just find them in tables in ch9 and annex c but nothing about them in ch3
thank you

cow and I replied with HDPE conduit; High Density Polyethylene. The NEC covers that under article 353. Here it is OSP (outside plant) conduit; it cannot be run in buildings, Im assuming because it hasnt been tested for (or fails) burn characteristics... but if it is embedded in a brick wall and terminates to equipment on the other side, it's not really in the building... or maybe not enough is for your AHJ to flag you for it.

 

[haitham]

cow and I replied with HDPE conduit; High Density Polyethylene. The NEC covers that under article 353. Here it is OSP (outside plant) conduit; it cannot be run in buildings, I'm assuming because it hasnt been tested for (or fails) burn characteristics... but if it is embedded in a brick wall and terminates to equipment on the other side, it's not really in the building... or maybe not enough is for your AHJ to flag you for it.

yea i Read it ,HDPE isn't permitted to use in buildings ,but ur reply move a question i'd be glad if u tell me about it , here most of buildings ,dwelling units is made of concrete and bricks ,,but i think there are many of USA's buildings depend on other materials like wood .metals .. right?
i wanna ask about the common conduits u using in buildings i think it may be RMC,IMC,EMC ,FMC..? and how do you install it ,i saw the expression concealed and exposed in NEC this mean you install raceways inside walls too and under floors ,how do you make it with different type of walls material there ..?
Thank you