What Does Cm Rated Cable Mean

Do you know what these terms really mean and which one does your project actually need.

What does cm rated cable mean. Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec. Cm cmg are the most commonly used commercial grade communication cable. What does cat mean. Cat simply stands for category.

Cmr cables are riser cables. A cmr rating means the cable can be used in the risers of commercial buildings because they limit the spread of flames better than cables in the cl cm family. When shopping for cables you may notice they re nearly always classified as cat 5 cat6e or something similar. This is the next step up.

In the case of cm the standard outlines general use or use in cases where the fire code does not place any restrictions on cable type. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable. These are used for regular networking from room to room as long as the cable does not need to pass through an air duct. When installing ethernet cable in walls or ceilings you may encounter terms like cm cmr cmp or some others like pvc and lszh.

Cmr cable often called riser rated cable is constructed to prevent fires from spreading floor to floor in vertical installations.