pvc raceways inside wall

[JFletcher]

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

Yes, most buildings here are made of wood or metal, with drywall (gypsum board) covering the inside. Solid concrete/masonry buildings are fairly rare; the only new construction I can think of that would be solid masonry would be jails/prisons. Of the brick buildings you see here, almost none of it is structural support, rather a facade or outer cover, like stucco or siding.

Most conduit is concealed, either inside of walls, above drop (acoustic tile) ceilings, in or under concrete slabs, or underground. Most of it is permitted to be run exposed, tho it often isnt for asthetic reasons; notable exceptions to this are warehouses, farms, and commercial buildings like grocery stores and "Big Box" stores like Wal-Mart, Home Depot, Lowes, etc.

Conduit run in slabs of concrete is laid before the concrete is poured. For walls, it is installed after the framing is completed. Where it transitions from inside a wall to outside, or wall to ceiling, it is sealed. Walls in buildings that have fire ratings would use a fire stop compound around such penetrations. Here, all vertical penetrations require fire stop, regardless of the conduit or wall type, or if the conduit is concealed or exposed.

We drill through brick, concrete walls, and cement block construction all the time to install conduit, tho they are just straight thru-penetrations. Nobody here would demo out a ton of bricks and reinstall them to conceal conduit. The conduit would be installed surface mount on the outside. If the conduit is coming thru the building on the inside, not just into the back of a panel, it might be concealed by a chase, run into an attic or crawlspace/basement, or surface mounted.

I'd say the most common conduit is EMT, followed by RPVC and RMC. Flexible conduits like ENT, FMC, or LFNMC are used mainly for whips, tho voice/data/communication installations may use quite a bit of ENT. With the correct fittings, ENT is also used in concrete pours.

What conduit is chosen is largely dependent on cost and application. Standard ENT for example cannot be run outdoors (no UV resistance) or in air handling spaces (toxic smoke). RMC can be run almost anywhere but is expensive compared to other conduit types.

 

[haitham]

Yes, most buildings here are made of wood or metal, with drywall (gypsum board) covering the inside. Solid concrete/masonry buildings are fairly rare; the only new construction I can think of that would be solid masonry would be jails/prisons. Of the brick buildings you see here, almost none of it is structural support, rather a facade or outer cover, like stucco or siding.

Most conduit is concealed, either inside of walls, above drop (acoustic tile) ceilings, in or under concrete slabs, or underground. Most of it is permitted to be run exposed, tho it often isnt for asthetic reasons; notable exceptions to this are warehouses, farms, and commercial buildings like grocery stores and "Big Box" stores like Wal-Mart, Home Depot, Lowes, etc.

Conduit run in slabs of concrete is laid before the concrete is poured. For walls, it is installed after the framing is completed. Where it transitions from inside a wall to outside, or wall to ceiling, it is sealed. Walls in buildings that have fire ratings would use a fire stop compound around such penetrations. Here, all vertical penetrations require fire stop, regardless of the conduit or wall type, or if the conduit is concealed or exposed.

We drill through brick, concrete walls, and cement block construction all the time to install conduit, tho they are just straight thru-penetrations. Nobody here would demo out a ton of bricks and reinstall them to conceal conduit. The conduit would be installed surface mount on the outside. If the conduit is coming thru the building on the inside, not just into the back of a panel, it might be concealed by a chase, run into an attic or crawlspace/basement, or surface mounted.

I'd say the most common conduit is EMT, followed by RPVC and RMC. Flexible conduits like ENT, FMC, or LFNMC are used mainly for whips, tho voice/data/communication installations may use quite a bit of ENT. With the correct fittings, ENT is also used in concrete pours.

What conduit is chosen is largely dependent on cost and application. Standard ENT for example cannot be run outdoors (no UV resistance) or in air handling spaces (toxic smoke). RMC can be run almost anywhere but is expensive compared to other conduit types.

Thank you for this clarification
i just wanna make sure if i got these two points :

For walls, it is installed after the framing is completed

so even with bricks no need to demo out , it is installing surface mounted like picture then putting the final cover such as gypsum board


2- for HDPE it isnt permitted inside building , can i say the FMC in the pic above is inside building ,but if it installed inside the wall itself the bricks - then covering it with concrete, can i consider this way isn't "inside building" ..

i got the point anyway and the method in the pic above it saves time ,effort ,may be a little more costs ,and i know the conduit i ask about isn't listed as NEC ,but just for thinking

 

[JFletcher]

Thank you for this clarification
i just wanna make sure if i got these two points :



so even with bricks no need to demo out , it is installing surface mounted like picture then putting the final cover such as gypsum board
View attachment 15804

2- for HDPE it isnt permitted inside building , can i say the FMC in the pic above is inside building ,but if it installed inside the wall itself the bricks - then covering it with concrete, can i consider this way isn't "inside building" ..

i got the point anyway and the method in the pic above it saves time ,effort ,may be a little more costs ,and i know the conduit i ask about isn't listed as NEC ,but just for thinking

You're welcome. Yes, the brick/masonry wall can be framed out to conceal the wiring, plumbing, add insulation, etc.

The cable type in that pic is AC, not FMC. Looks almost identical but AC has the conductors already installed, like MC. It isnt a raceway tho; you can put as many bends in a section as you need w/o pull points/j-boxes.

Im not sure if HDPE or other OSP conduit types would be allowed in the exterior wall of a building. I think I have seen some in crawlspaces.

 

[kwired]

Most any raceway or cable is considered outside of a building if it is encased in at least 2" of concrete. Of course it also needs to be a type allowed to be embedded in concrete or use concrete tight fittings.

 

[Galt]

We are using it under the concrete in a free stall dairy barn.

 

[iwire]

We are using it under the concrete in a free stall dairy barn.

How do you get from under the slab up to the equipment?

 

[haitham]

You're welcome. Yes, the brick/masonry wall can be framed out to conceal the wiring, plumbing, add insulation, etc.

The cable type in that pic is AC, not FMC. Looks almost identical but AC has the conductors already installed, like MC. It isnt a raceway tho; you can put as many bends in a section as you need w/o pull points/j-boxes.

Im not sure if HDPE or other OSP conduit types would be allowed in the exterior wall of a building. I think I have seen some in crawlspaces.

thank you

 

[haitham]

Most any raceway or cable is considered outside of a building if it is encased in at least 2" of concrete. Of course it also needs to be a type allowed to be embedded in concrete or use concrete tight fittings.

this is good information for me

 

[haitham]

How do you get from under the slab up to the equipment?

can you explain

 

[kwired]

can you explain

He is asking how one brings HDPE that is allowed under ground or under the slab up to areas above the slab where HDPE is not permitted.

Answer is you either transition below grade before emerging to PVC or other raceway type, there are supposed to be fittings for this though I have always used standard PVC fittings, or you can encase the HDPE in at least 2 inches of concrete.

 

[iwire]

:thumbsup:

 

[kwired]

:thumbsup:

And in the free stall dairy barn where the question was prompted you encase it in concrete if emerging from grade, neither PVC or the HDPE will take the abuse it is likely to endure.

 

[haitham]

And in the free stall dairy barn where the question was prompted you encase it in concrete if emerging from grade, neither PVC or the HDPE will take the abuse it is likely to endure.

:thumbsup: Thank you I got it now :thumbsup:

 

[jeremy.zinkofsky]

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

The difference between PVC schedule 80 and schedule 40 is the wall diameter. Schedule 80 has a thicker wall.

 

[samarcus]

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

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