Standard cabling Specification-safety grade for the industry

The wiring industry is tightly regulated in terms of transmission performance and security. Cabling security is critical, and various standard entities and industry organizations around the world have developed comprehensive documentation for this purpose.

Cabling safety one of the most recognized authorities is the American Insurance Business Laboratory (UL), a non-profit organization that is committed to establishing and maintaining safety standards for a wide variety of industries. UL for the wiring industry provides a large number of quality inspection services. The services provided include:

Included in the UL list-check wiring and related hardware safety level.

UL inspection-According to the Tia/eia wiring standard set out the performance specification, the inspection wiring transmission performance and the safety grade, and through the quality assurance monitoring and the factory surprise inspection, carries on the inspection regularly.

UL Communication wiring

The UL uses the wiring which the voice and the data system divides into "the communication wiring and the cable", abbreviation for CM. This category provides a variety of security levels for specific applications to test the quality of cable jackets, as detailed in the following:

CMP: Full-level communication cable, which is the highest level of cable safety, has the perfect flame retardant capability and emits low levels of smoke and toxins. According to the UL definition, a bundle of CMP cables must be extinguished within 5 meters of combustion in a forced dense combustion condition. CMP cables Use Teflo chemicals to prevent combustion from spreading, minimizing the smoke and toxins emitted. Compared with the lower UL grade cable, this adds a lot of cost. The CMP-level cable is used in a building where the air is routed back to the inner cable. In the event of a fire, the building will not be filled with a large amount of smoke or dangerous toxins emitted by the cable. The United States uses this kind of back-gas mesh widely, but it is used less in other parts of the world. CMP-level cables must undergo rigorous combustion testing: ul910-"flame spread smoke density test"---http://bianceng.cn (learn computer)

CMR: Trunk level communication cable. This is the second-ranking cable, which has the perfect flame retardant capability, but does not have the emission of smoke toxin test. In addition to CMP and cables, the CMR cable and all other communication cables use halides based chemicals, such as chlorine, to prevent combustion from spreading. By definition, a bundle of CMR cables must be extinguished within 5 meters of combustion when the fan is forced to burn. CMR cable coats are generally made of a type of PVC, in the combustion chamber will emit chlorine, chlorine will deplete the oxygen in the air, so that the flames extinguished. The CMR-grade cable is widely used in mainline applications where the ventilation system is physically separate from the wiring system. This is very common in Asia and Australia. CMR-level cables must undergo intensive flame testing: ul1666-"vertical to medium-mounted cable flame propagation height test"

CM/CMG: General communication wiring. This is common in the horizontal alignment of the building, where they are usually divided into smaller bundles than the CMR-grade cables. CM/CMG-grade cables are used for the chemical substances based on halides. By definition, in a small bundle of cables, the CM/CMG cable must be extinguished within 5 meters of the combustion spread. The flame does not use a fan for forced combustion. CM/CMG-grade cable jackets are usually made of a type of PVC, which emits chlorine in the combustion chamber. CM/CMG-level cables are commonly used in the horizontal alignment of the UK, Asia and Australia. CM/CMG level cable must undergo CSA FT-4 "vertical combustion test"

CMX: Residential communication wiring. This cable is limited to other small applications where the number of residential or communication cables used is very low, and these applications typically only have one cable installed. CMX-level tools cannot be used in bundles of cable applications. CMX Grade cable must undergo UL VW1 combustion test

Low Smoke 0 Halogen (LSZH)

Another safety level used in the wiring industry is a low smoke 0 halogen (LSZH) cable. This safety level is divided by ISO/IEC standards and is widely used in Europe.

The Lszh level, like the UL CMP class, tests the flame retardancy and the emitted gas. As the name suggests, the burning Lszh does not emit halide gas, the smoke emitted is very low. Lszh grade cable can be used for copper and fiber optic communication cable, its structure is similar to the UL grade cable.