CM cables have basic flame-retardant performance and can self-extinguish in single vertical flame tests. They are commonly used in homes, offices, and standard room environments. However, they are not suitable for riser shafts or air-handling spaces, where fire and smoke could. Ethernet bulk cables installed in walls, risers, and plenum spaces must meet strict fire safety standards. 2-hour fire-resistant cables can maintain circuit integrity and continue to operate under certain conditions, which is why they are also called circuit integrity (CL) cables. CMP cables are designed for plenum spaces—areas that circulate air, such as air-handling ducts or spaces above drop ceilings. The standard defines an 8 feet long vertical tray flame test for 20 minutes, over which the flame of the cable. CM (Communications Multipurpose Cable) represents the most basic flame-retardant level for communication cables.
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