Low Voltage · Structured Cabling
Plenum-Rated Cable (CMP)
Communications cable with a low-smoke, flame-resistant jacket (CMP/CL2P) required by NEC Article 800 in air-handling plenum spaces. Using non-plenum cable in a plenum is a common inspection failure.
Common uses
Cabling above drop ceilings used as return-air plenums
Safety note
Wrong jacket rating is a real fire-spread hazard, not just a code technicality.
Related terms
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