What Does Cm Rated Cable Mean

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 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. Cmr cables are riser cables. Cm cmg are the most commonly used commercial grade communication cable. This is the next step up.

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. They can be installed anywhere except plenums. When shopping for cables you may notice they re nearly always classified as cat 5 cat6e or something similar.

Often this type of cable meant for home usage will carry an x suffix signifying that it is intended for use in buildings where the cable is enclosed in a non combustible conduit. 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. Cl2 and cl3 cable doesn t reduce smoke or gases but minimize the possibility of shock.

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.