1. Supercharged level. This includes CMP copper (UTP and ScTP) and OFNP or OFCP fiber optic cables, making it the highest rated cable. On a bundle of supercharger-grade cables, when a fan is forced to blow the flame, the flame on the cable will self-extinguish within 5m. Moreover, since such a cable contains a chemical substance, it does not emit toxic fumes or steam when it is burned or at an extremely high temperature. In the United States, supercharged cable is the preferred cable. In communication wiring, it is typically installed in an air return boost system used by ventilation ducts or air handling equipment.
2. Trunk level. This includes CMR copper cables and OFNR or OFCR fiber optic cables, making it the second-ranked cable. In the case of a forced air blow by a fan, the flame on the cable must be extinguished within 5m, but it has no smoke or toxicity specifications. Other countries outside the United States typically use such fire rated cables in building trunks and horizontal cables.
3. Commercial grade. This includes CM copper cables as well as OFN or OFC fiber optic cables. Commercial grade cables are lower than the mains grade, and the flames on the bundled cables must spread out within 5m, but there are no restrictions on forced air blowing by the fans, nor smoke or toxicity specifications. Commercial grade cables are often used for horizontal routing and are typically bundled together.
4. General level. This includes CMG copper cables as well as OFNG or OFCG fiber optic cables. This level of cable performance is similar to the commercial grade.
5. Home level. This refers to the CMX copper cable, which has no fiber classification and is the lowest in the UL fire rating. The flame on a household grade cable must be self-extinguishing when it spreads within 5m, but there is no smoke or toxicity specification. Home grade cables are typically only used in home or small office systems where each cable is laid separately. It should not be laid in bundles because the flame spread of bundled cables is very different from that of a cable.
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