CM type communication wire used in single family house???

[raider1]

ok...so a drop ceiling that is used as a air system, needs to be plenum wire(CMP) does it also have to be in pipe???

Read 300.22(C)(1) for the wiring methods permitted in other spaces used for environmental air.

Chris

 

[sparks2000]

I did...I'm still confused?

 

[raider1]

I did...I'm still confused?

Here is a quote from 300.22(C)(1):

Other types of cables, conductors, and raceways shall be permitted to be installed in electrical metallic tubing, flexible metallic tubing, intermediate metal conduit, rigid metal conduit without an overall nonmetallic covering, flexible metal conduit, or, where accessible, surface metal raceway or metal wireway with metal covers or solid bottom metal cable tray with solid metal covers.

This says other type of cables (including CMP) shall be permitted to be installed in EMT etc...

Hope this helps.

Chris

 

[sparks2000]

so does that cable have to be CMP or can it be CM,CMX ect...

 

[raider1]

so does that cable have to be CMP or can it be CM,CMX ect...

According to 800.154(A). only Type CMR and CMP cables shall be permitted to be installed in raceways in other spaces used for enviromental air.

800.154 Applications of Listed Communications Wires and Cables and Communications Raceways.
Communications wires and cables shall comply with the requirements of 800.154(A) through (D), 800.154(F), and 800.154(G), or where cable substitutions are made in accordance with 800.154(E).
(A) Plenum. Cables installed in ducts, plenums, and other spaces used for environmental air shall be Type CMP. Abandoned cables shall not be permitted to remain. Types CMP, CMR, CMG, CM, and CMX and communications wire installed in compliance with 300.22 shall be permitted. Listed plenum communications raceways shall be permitted to be installed in ducts and plenums as described in 300.22(B) and in other spaces used for environmental air as described in 300.22(C). Only Type CMP cable shall be permitted to be installed in raceways.

Chris

 

[sparks2000]

CMR too???

 

[raider1]

CMR too???

Nope my bad 800.154(A) only states CMP not CMR in raceways.

Chris

 

[sparks2000]

OK! So the word plenum on a box of cable is kind of misleading, all plemun cable used in those areas needs to be in metal conduit!!!

 

[raider1]

OK! So the word plenum on a box of cable is kind of misleading, all plemun cable used in those areas needs to be in metal conduit!!!

Pretty much.

Chris

 

[sparks2000]

Thank for explaining!

 

[raider1]

Keep in mind though that alot suspended ceiling spaces are not used to convey environmental air and are not subject to 300.22(C).

Chris

 

[sparks2000]

yeah, therfore any other of those cables can be used.

I did a hospital and they had therehouse electrician pipe everything in the air hadeler space, I just pulled in the cable, just couldnt remember if it was CMP, I hope so!!!!???

 

[sparks2000]

I hope!!!:grin:

 

[hbiss]

If it was in conduit it wouldn't have to be plenum listed cable.

-Hal

 

[don_resqcapt19]

If it was in conduit it wouldn't have to be plenum listed cable.

-Hal

If the cables are in a metallic Chapter 3 raceway, within the other space used for environmental air, they can be any type of cable. If they are in a listed plenum raceway, they must be CMP.

 

[sparks2000]

Thank you, I got my answer, awesome forum!!!