Originally Posted by superscott
There are many many different UL Marking found on devices. They have different meanings. UL (Underwriters Labratories, Inc.) just verifies that the product has been tested to meet a certain standard (safety, data transmission, etc.) then puts their stamp of approval on it. Doesnt have anything to do with Plenum or non plenum usage.
ABSOLUTELY DEAD WRONG!
UL has 4 different markings: Recognized, Listed, Classified, and Verified.
Recognized is for a specific component in a listed device or package
Listed products have completed a series of mechanical, electrical and thermal characteristics tests which simulate reasonable and foreseeable hazards.
Classified products undergo further tests for specific hazards, performance tests under specified conditions, regulatory code requirements,
Verified marking are performance based tests as part of a specific system
Listed cables have been tested in accordance NFPA requirements for flame propogation.
The only difference between CMR (riser) and CMP (plenum) is their flame propogation properties. Riser rated cables are suitable for vertical shafts and non-air return spaces. Plenum rated cables are suitable for return air plenums. They are basically made from the same "ingredients", just different quantities of them.
Audio Visual cables are typically marked CL2 and CL3, CL2R and CL3R, CL2P and CL3P
STAY AWAY FROM ANTHING MARKED WITH AN "x"! (CMX, CLX, etc)
And yes, CM rated cables are fine for residential use. Usually though, Cat5e cables are CMR or CMP. CM is mostly reserved for patch cables.
And yes again, residential construction does not have the requirements that commercial construction has. Most jurisdictions dont even have permit requirements for low voltage cabling.