Cable safety class according to wiring specification_Anhui Honglin Instrument Cable Co., Ltd.

Cable safety class according to wiring specification

Author：hlyb Add Time：2016-03-03 16:12:50

The cabling industry is strictly regulated in terms of transmission performance and safety. Cabling safety is critical and has been fully documented by standards entities and industry bodies around the world.

One of the recognized authorities of wiring safety is Underwriters Laboratories (UL), a non-profit organization dedicated to establishing and maintaining safety standards for many industries. UL provides a large number of quality inspection services for the wiring industry. Its services include:

UL listing - verify wiring and associated hardware safety levels.

UL inspection - inspect the transmission performance and safety level of wiring according to the performance specifications listed in TIA / EIA wiring standards; And conduct regular inspection through quality assurance monitoring and factory surprise inspection.

UL communication wiring

UL divides the wiring used by voice and data systems into "communication wiring and cables", abbreviated as cm. This category provides a variety of safety levels for specific applications to verify the quality of cable jackets, as follows:

CMP: filled communication cable, which is * * * high cable safety grade. It has WM * * * * flame retardant capacity and emits very low smoke and * * *. According to UL definition, under the condition of forced dense combustion of fan, a bundle of CMP cable must * * * extinguish itself within 5 meters of combustion diffusion. CMP cable uses teflo based chemicals to prevent combustion diffusion and make the emitted smoke and ****** reach * * * small. This adds a lot of cost compared to cables with lower UL rating. CMP grade cables are used in buildings where cables are laid in the ventilation return air. In case of fire, the building will not be filled with a large amount of smoke or danger emitted by cables. This return network is widely used in the United States, but less in other parts of the world. CMP grade cables must * * * undergo strict combustion test: ul910 - "flame propagation and smoke density value test"

CMR: trunk level communication cable. This is the second highest rated cable. It has WM * * * * flame retardant capacity, but there is no inspection on the emitted smoke. Except CMP and cables, CMR cables and all other communication cables use halide based chemicals such as chlorine to prevent combustion diffusion. According to the definition, under the condition of fan forced combustion, a bundle of CMR cables must * * * extinguish itself within 5 meters of combustion diffusion. CMR cable jacket is generally made of some kind of PVC. Chlorine will be emitted in the combustion chamber, which will deplete the oxygen in the air and extinguish the flame. CMR grade cables are widely used in trunk applications where ventilation systems are physically separated from cabling systems. This is very common in Asia and Australia. CMR grade cables must * * * undergo dense flame test: UL1666 - "flame propagation height test of cables connected to vertical installation in"

Cm / CMG: general communication wiring. This is common in the horizontal routing of buildings, and they are usually divided into smaller bundles than CMR grade cables. When cm / CMG grade cables use halide based chemicals, the wiring group is natural. According to the definition, in a small bundle of cables, cm / CMG cable must * * * extinguish itself within 5 meters of combustion diffusion. The flame is not forced to burn by fan. The cm / CMG cable jacket is usually made of some kind of PVC and emits chlorine in the combustion chamber. Cm / CMG grade cables are usually used in horizontal routing in the UK, Asia and Australia. Cm / CMG grade cables must * * * pass CSA ft-4 "vertical burning test"

CMX: residential communication wiring. This cable is limited to residential or other small applications where the number of communication cables used is very small. These applications generally * * * lay one cable. CMX grade tools cannot be used in bundled cable applications. CMX grade cables must be * * * ul vw1 flame tested

Low smoke zero halogen (LSZH): another safety level used in the cabling industry is low smoke zero halogen (LSZH) cables. This safety level is divided by ISO / IEC standard and is widely used in Europe. LSZH grade is the same as UL CMP grade, which tests the flame retardancy and emitted gases. As the name suggests, the burning LSZH will not emit halide gas, and the smoke emitted is very low. LSZH cable can be used for copper cable and optical fiber communication cable, and its structure is similar to UL cable.

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Cable safety class according to wiring specification