Cm Rated Cable Means

Cables often have a cm cmg or cmr rating as defined by the national electrical code nec.

Cm rated cable means.

They can be installed anywhere except plenums. When installing ethernet cable in walls or ceilings you may encounter terms like cm cmr cmp or some others like pvc and lszh. It is intended for general use within buildings in accordance with the nec article 800 53 e 1. All of them are in practical terms suited for in wall.

All of the canare cables belden 1808a and bjc yc 2 s video cable. Guide to cable ratings. 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. Some of the cables we carry aren t nec rated so they re missing from the table below.

This is the next step up. That doesn t mean that your local electrical inspector won t allow these to be installed in wall but it does raise the possibility. Cl2 and cl3 cable doesn t reduce smoke or gases but minimize the possibility of shock. Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec.

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. Cmx is a residential grade cable. 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. 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. Do you know what these terms really mean and which one does your project actually need. These cables do not spread flame to the top. 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. Cm cmg are the most commonly used commercial grade communication cable. Plenum cables are the highest standard and can safely be substituted for any other cable type such as riser cm cl2 or cl3 cables. What is cmp rated cable.

Local codes are typically based on the national electric code nec published by the national fire protection association. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable.