CL3
General Purpose – Power-Limited Circuit Cables (PLTC), this is the rating primarily used for your multi-conductor, stranded cables such as alarm wire, speaker wire, and control cables.
CL3P
Plenum – Designed for installation in a duct, a plenum space, or other spaces that will be used to transport environmental air without being enclosed in a raceway.
CL3R
Riser – Designed for installation in a vertical shaft, or for installations where the cables will penetrate more than one floor.
CL3X
Limited Use – Cables for limited use in unconcealed spaces where the exposed length of cable does not exceed 3.05m (10 feet).
CM
General Purpose – In-wall rated cables designed to be installed where neither Plenum nor Riser cables are required.
CMP
Plenum – Designed for installation in a duct, a plenum space, or other spaces that will be used to transport environmental air without being enclosed in a raceway. Not for outdoor use or exposure to elements.
CMG
General Purpose – In-wall rated cables designed to be installed where neither Plenum nor Riser cables are required.
CMR
Designed for all in-wall and riser applications that do not include plenum or other air-handling spaces.
CMX
Outdoor – This cable has been designed and tested for use in outdoor locations. Before approval, this cable goes through rigorous heat/cold testing as well as sunlight resistance on the outer jacket. Only a cable marked as Type CMX – Outdoor is designed for outdoor exposure.
FT1
Vertical Flame Test – This is the most basic CSA flame test rating, and is equivalent to the CM flame test ratings.
FT4
Vertical Flame Test – This is the most common CSA flame test rating, and is equivalent to UL CMR.
FT6
CSA Flame Test Rating – This is the most rigorous CSA flame test rating, and is equivalent to CMP.