Mc in plenum ceiling...

Status
Not open for further replies.
You cannot use standard MC in a plenum. You would have to buy MC that is rated for said use--it has interlocking tape
 
joebell said:
I do not see any reason why you would not be able to use MC cable in a plenum ceiling. I think your OK

Joe
Click to expand...
I do agree. 300.22(C)(1) allows the use of it. I questioned it for a second because a co-worker said it had to a special MC with a coating or something. I was just double checking myself. :)
 
resistance said:
You cannot use standard MC in a plenum. You would have to buy MC that is rated for said use--it has interlocking tape
Click to expand...


Resistance

There is no restriction of the installation of MC cable in a plenum ceiling in the listing of the MC cable or in Article 330

The only mention of the interlocking tape is for grounding purposes

Joe
 
If you are working with a drop ceiling then I believe the MC cable is acceptable. If what you are working in an area that is truely a plenum then the MC cable is not allowed. See the Articles I mentioned in the last post.
 
joebell said:
Resistance

There is no restriction of the installation of MC cable in a plenum ceiling in the listing of the MC cable or in Article 330

The only mention of the interlocking tape is for grounding purposes

Joe
Click to expand...
I disagree.
My question: is it true that they manufacture more than one type of MC cable?
 
resistance said:
I disagree.
My question: is it true that they manufacture more than one type of MC cable?
Click to expand...

Yes, they manufacture many types of MC, some with an overall nonmetallic covering. This type of MC cable would not be permitted in a suspended ceiling used as a plenum.

But standard MC cable without an overall nonmetallic covering can be used in a suspended ceiling used for enviromental air-handling purposes. Take a look at 300.22(C)(1).

Chris
 
Is it plenum ceiling or an air handling space? Big difference.
Most of the time its an air handling space. I pointed this out at work the other day and they said "same thing", but its not.
 
Is it plenum ceiling or an air handling space? Big difference.
Most of the time its an air handling space. I pointed this out at work the other day and they said "same thing", but its not.
Click to expand...
Good question, and something I asked in my earlier post. The question still remains.

Yes, they manufacture many types of MC, some with an overall nonmetallic covering. This type of MC cable would not be permitted in a suspended ceiling used as a plenum.

But standard MC cable without an overall nonmetallic covering can be used in a suspended ceiling used for enviromental air-handling purposes. Take a look at 300.22(C)(1).

Chris
Click to expand...

At least we agree on the fact that they manufact more than one type of MC cable. Seeing that MC cable comes in many types, then would you agree that Plenum rated MC cable is manufactured (NEC 110.3) for a purpose of installing in plenums, and that not all MC cable is allowed in plenums?

See: http://search2.southwire.com/search?q=cache:QGJpcZtszZ0J:www.southwire.com/Southwire/StaticFiles/Text/6181MCCAT01_BranchMC.pdf+MC+cable+in+plenum&access=p&output=xml_no_dtd&site=default_collection&ie=UTF-8&client=default_frontend&proxystylesheet=default_frontend&oe=UTF-8
 
tom baker said:
Is it plenum ceiling or an air handling space? Big difference.
Most of the time its an air handling space. I pointed this out at work the other day and they said "same thing", but its not.
Click to expand...


Tom

FMOI Could you please explain to me the difference?

Joe
 
resistance said:
At least we agree on the fact that they manufact more than one type of MC cable. Seeing that MC cable comes in many types, then would you agree that Plenum rated MC cable is manufactured (NEC 110.3) for a purpose of installing in plenums, and that not all MC cable is allowed in plenums?
QUOTE]

In the OP it was asked can MC cable be installed in a plenum ceiling ,I took this to mean regular metal jacketed MC cable there was no mention of PVC coated or any other type of MC cable.

So as for regular metal jacketed MC yes it can be installed in the ceiling as set forth in 300.22(A) & (B), as well as 330.10 and in the UL white book under Metal-Clad Cable (PJAZ).

Joe
Click to expand...
 
Status
Not open for further replies.
Top