Cabling Standard for cable safety

Cabling Standard for cable safety
The wiring industry is subject to strict regulation of transmission performance and safety. Wiring security is critical, and various standards and industry organizations around the world have compiled comprehensive documentation for this.
One of the most recognized authority in wiring security is the American Underwriters Laboratories (UL), a non-profit organization dedicated to the establishment and maintenance of safety standards for multiple industries. UL provides a lot of quality inspection services for the wiring industry. The services provided include:
Included in the UL list - check wiring and related hardware security levels.
UL inspection - check the transmission performance and safety level of the wiring in accordance with the performance specifications listed in the TIA/EIA cabling standards and conduct periodic inspection through quality assurance monitoring and factory surprise inspections.
UL communication routing
UL divides voice and data systems into "communication wiring and cables", abbreviated as CM. This class provides a variety of safety levels for specific applications to test the quality of the cable jacket:
CMP: filling level of communication cable, cable which is the highest level of security, it has perfect flame retardant ability, low smoke and emit toxins. According to the definition of UL, the fan intensive combustion conditions, a bundle of CMP cable must be less than 5 meters in the flame spread of self extinguishing. CMP cables use Teflo based chemicals to prevent the spread of combustion, so that the smoke and toxins to reach the minimum. This increases the cost of the cable compared to the lower class of UL. CMP cable is used for ventilation in the back to cable laying gas building. In the event of fire, the building will not be filled with a large amount of smoke emitted by cables or dangerous toxins. Widely used in the United States back to the gas network, but in other parts of the world use less. Class CMP cables must undergo a rigorous combustion test: UL910- "flame propagation and smoke density test"
CMR: trunk level communication cable. This is a class second cable, which has a perfect flame retardant capability, but does not have a test for the distribution of smoke. In addition to CMP and cables, CMR cables and all other communication cables use halide based chemicals, such as chlorine, to prevent the spread of combustion. According to the definition, the fan forced burning conditions, a bundle of CMR cable must be less than 5 meters in the flame spread of self extinguishing. CMR cable jacket is generally made of a kind of PVC, in the combustion chamber will emit chlorine, chlorine will deplete the oxygen in the air, so that the flame out.
Class CMR cables are widely used in trunk applications where the ventilation system is physically separated from the wiring system. This is very common in Asia and australia. Must undergo intensive fire test CMR cable: UL1666- cable installed in the vertical flame spread test to the height of "CM/CMG: general communication wiring. This is common in the horizontal line of the building, which is usually divided into smaller bundles, compared with the CMR class. CM/CMG cable based on the use of chemical substances when natural halide group. According to the definition, in a small bundle of cables, CM/CMG cable must be burning
Burn not to extinguish diffusion within 5 meters. The flame did not use the fan forced combustion. The CM/CMG class cable jacket is usually made of a certain type of PVC, which emits a chlorine in the combustion chamber. Class CM/CMG cables are commonly used in horizontal lines in the UK, Asia and australia. CM/CMG class cable must pass CSA FT-4 "vertical burning test".
CMX: residential communications cabling. This cable is limited to other small applications in residential or the use of a very small number of communication cables, these applications generally only laying a cable. CMX level tools cannot be used for bundled cable applications. CMX class cables must be tested by UL VW1 low smoke zero halogen (LSZH): another safety grade used in wiring industry is low smoke zero halogen (LSZH) cable. This security level is divided into ISO/IEC standards, widely used in europe. LSZH class UL and CMP level, to test the ability to fire and gas emissions.
As the name suggests, the combustion of LSZH does not emit a halide gas, the emission of smoke is very low. LSZH cable can be used for copper and fiber communication cable, and the structure of UL cable is similar.