Cm Rated Cable Means

Local codes are typically based on the national electric code nec published by the national fire protection association.

Cm rated cable means.

Cmx is a residential grade cable. Such cables are limited to residential or other small applications where the number of communication cables used is very little. Or cmr rated cable. Among all these terms cm cmr and cmp are the most common ethernet cable ratings specified by the national electric code nec.

Cables often have a cm cmg or cmr rating as defined by the national electrical code nec. 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. Plenum cables are the highest standard and can safely be substituted for any other cable type such as riser cm cl2 or cl3 cables. Some of the cables we carry aren t nec rated so they re missing from the table below.

They can be installed anywhere except plenums. It is intended for general use within buildings in accordance with the nec article 800 53 e 1. These cables do not spread flame to the top. This is the next step up.

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. What do these acronyms mean and why do they matter. All of them are in practical terms suited for in wall. 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. What is cmp rated cable. That doesn t mean that your local electrical inspector won t allow these to be installed in wall but it does raise the possibility. Another common cable rating is cm which denotes communications cable such as cat 5e or cat 6 networking cable.

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 installing ethernet cable in walls or ceilings you may encounter terms like cm cmr cmp or some others like pvc and lszh. 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. All of the canare cables belden 1808a and bjc yc 2 s video cable.