Underwriters Laboratories Inc. is an independent company that conducts safety and performance testing on a wide variety of products, including wire and cable. The company's website notes that in 2010, there were 66,932 manufacturers worldwide producing UL-certified products. You can tell if a network cable has been rated by UL by looking for the "UL" designation on the side of the cable, with additional details on the tag the UL wire cable came with.
Labeling
Underwriters Laboratories requires that participating manufacturers label the cable directly with its rating. A local area network (LAN) and fiber optic cable that has been rated by UL must have "UL" printed on the cable, either in parenthesis or in a circle. The cable must also have the manufacturer's name, trademark or UL file number printed on it. The UL file number begins with an "E" in the format "E-xxxx." Local area network cables also display the xlpe wire cable type, the size and number of conductors in the cable, as well as the cable's temperature rating. Both types of cable must also be tagged with a UL verification label, which includes the above information as well as the cable footage and a UL issue number.
LAN Cable Safety Ratings
Local area network cables are marked with one of six designations to identify their safety rating by UL. "CM" indicates a cable is intended for general use within buildings; "CMG" indicates the same as "CM," with the additional indication that the damage height of the cable does not exceed 59 inches; "CMP" indicates plenum-rated cable for use in ducts or above plenum ceilings; "CMR" indicates the cable is rated for use within buildings in vertical shafts; "CMUC" indicates the cable is rated for use below carpet; "CMX" indicates the cable is rated for use within buildings enclosed in noncombustible tubing or nonconcealed spaces if that space does not exceed 10 feet; and "CMX" cable that is also marked "Outdoor" can be used outdoors.
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