What Does Cm Rated Cable Mean

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.

What does cm rated cable mean.

When shopping for cables you may notice they re nearly always classified as cat 5 cat6e or something similar. When installing ethernet cable in walls or ceilings you may encounter terms like cm cmr cmp or some others like pvc and lszh. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable. Cl2 and cl3 cable doesn t reduce smoke or gases but minimize the possibility of shock.

Cmr cables are riser cables. Cmr cable often called riser rated cable is constructed to prevent fires from spreading floor to floor in vertical installations. What does cat mean. Cat simply stands for category.

Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec. These are used for regular networking from room to room as long as the cable does not need to pass through an air duct. They can be installed anywhere except plenums. Do you know what these terms really mean and which one does your project actually need.

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.