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The National Electrical Code Requirements (NEC)

CMP            used in plenums
CMR            used in vertical riser shafts
CM            general purpose, except in plenums and vertical riser shafts
CMX              limited use; for dwellings and for use in raceways
CMUC          for use under carpets
MPP, MPR, MP    these are multi-purpose cables which meet both the requirements of the pertinentcommunications cable type and also certain requirements pertinent to fire protection signalling cables

Optical fiber cables generally follow the same classification as for metallic communications cables (Article 770):

OFCP, OFNP        used in plenums
OFCR, OFNR      used in vertical riser shafts
OFC, OFN          general purpose, except in plenums and vertical shafts

Fire protection signalling cables are also classified in a similar manner (Article 760):

FPLP            used in plenums
FPLR            used in vertical riser shafts
FPL            general purpose, except in plenums and vertical shafts

Remote-control, signalling, and power-limited circuit cables (Article 725):

CL2P, CL3P        used in plenums
CL2R, CL3R        used in vertical riser shafts
CL2, CL3        general purpose, except in plenums and vertical shafts
CL2X, CL3X        limited use
PLTC            power-limited tray cable, for use in hazardous locations

Community antenna television cables (Article 820):

CATVP        used in plenums
CATVR        used in vertical riser shafts
CATV        general purpose, except in plenums and vertical shafts
CATVX        limited use

Source : NEC

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