Which network-cable rating is specifically manufactured with low-smoke, fire-retardant materials so it can be safely routed through air-handling (plenum) spaces in a building ceiling or raised floor?
Riser (CMR)
Outdoor/direct-burial
PVC/general-purpose (CM)
Plenum (CMP)
Plenum-rated (CMP) cable has a jacket made from special low-smoke, flame-retardant compounds that meet NFPA 262 requirements. This prevents the cable from quickly spreading flames or producing dense toxic smoke when installed in HVAC return-air spaces. Riser (CMR) and general-purpose PVC (CM) cables have less-stringent flame tests, and outdoor/direct-burial cable is designed for moisture protection, not for fire safety in plenum spaces.
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