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 pertinent communications 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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