What Does Cm Rated Cable Mean

Cmr cables are riser cables.

What does cm rated cable mean.

They can be installed anywhere except plenums. 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. Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec. 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. Cl2 and cl3 cable doesn t reduce smoke or gases but minimize the possibility of shock. Cat simply stands for category. Cmr cable often called riser rated cable is constructed to prevent fires from spreading floor to floor in vertical installations.

Do you know what these terms really mean and which one does your project actually need. 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. These are used for regular networking from room to room as long as the cable does not need to pass through an air duct.

What does cat mean.