Cm Rated Cable Means

It is intended for general use within buildings in accordance with the nec article 800 53 e 1.

Cm rated cable means.

Local codes are typically based on the national electric code nec published by the national fire protection association. When installing ethernet cable in walls or ceilings you may encounter terms like cm cmr cmp or some others like pvc and lszh. 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. Cmr cable often called riser rated cable is constructed to prevent fires from spreading floor to floor in vertical installations.

Plenum cables are the highest standard and can safely be substituted for any other cable type such as riser cm cl2 or cl3 cables. Guide to cable ratings. Do you know what these terms really mean and which one does your project actually need. Cables often have a cm cmg or cmr rating as defined by the national electrical code nec.

They can be installed anywhere except plenums. These cables do not spread flame to the top. Cmx is a residential grade cable. 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 do these acronyms mean and why do they matter. Some of the cables we carry aren t nec rated so they re missing from the table below. 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. Cm cmg communications cable for general purpose use.

Cable jacket ratings uses and substitutions when installing cabling in walls and ceilings it is important to use cables that meet the local code requirements. All of them are in practical terms suited for in wall. Such cables are limited to residential or other small applications where the number of communication cables used is very little. In practice communications cable generally means network cable type cm cables are generally the minimum jacket ratings suitable for in wall installation of network cables and are appropriate for installation inside a residence or a single story commercial building.

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. Cl2 and cl3 cable doesn t reduce smoke or gases but minimize the possibility of shock.

Or cmr rated cable. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable.