What Does Cm Rated Cable Mean

Cat simply stands for category.

What does cm rated cable mean.

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. These are used for regular networking from room to room as long as the cable does not need to pass through an air duct. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable.

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

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. This is the next step up. Cm cmg are the most commonly used commercial grade communication cable. Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec.

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