Cable safety level in cabling specifications

The cabling industry is strictly regulated in terms of transmission performance and security. Wiring security is crucial. Various standard entities and industry bodies around the world have prepared comprehensive documents for this purpose.

One of the most recognized authoritative organizations for wiring security is the U. S. Insurance vendor lab UL), a non-profit organization dedicated to establishing and maintaining security standards for multiple industries. UL provides a large number of quality control services for the cabling industry. Its services include:

Included in UL list-inspect cabling and related hardware security levels.

UL testing-tests the transmission performance and security level of the wiring according to the performance specifications listed in the TIA/EIA Cabling Standards, and conducts regular inspections through quality assurance monitoring and factory spot checks.

UL Communication Wiring

UL divides the cabling used by voice and data systems into "communication cabling and cables", abbreviated as CM. This category provides a variety of security levels for specific applications to test the quality of cable jackets. For details, see:

CMP: Fill-level communication cable, which is the highest cable Safety Grade and has a perfect flame retardant capability with very low smoke and toxin emissions. According to UL's definition, a bundle of CMP cables must be self-extinguished when the fan is forced to burn in dense combustion conditions less than 5 meters. CMP cables use Teflo-based chemicals to prevent the spread of combustion and minimize the amount of smoke and toxin emitted. Compared to cables with lower UL levels, this increases the cost. CMP-level cables are used in buildings where Ventilation and Air Return are routed to the cabin. In the event of a fire, the building will not be filled with a large amount of smoke or dangerous toxins emitted by cables. The United States is widely used in this retrieval mesh, but it is rarely used in other parts of the world. CMP-grade cables must undergo rigorous Combustion tests: UL910-"flame propagation combined smoke density value test"

CMR: Trunk-level communication cable. This is the second-most rated cable, which has the perfect flame retardant capability, but does not have a test on the smoke and toxin emitted. Except CMP and cable, CMR cables and all other communication cables use halogen-based chemicals, such as chlorine, to prevent the spread of combustion. According to the definition, a bundle of CMR cables must be self-extinguished less than 5 meters after the fan is forced to burn. The CMR cable jacket is generally made of a type of PVC, which emits chlorine gas in the combustion chamber, and chlorine consumes oxygen in the air to extinguish the flame. CMR-level cables are widely used in trunk lines that are physically separated from the cabling system. This is common in Asia and Australia. CMR-level cables must undergo dense flame tests: UL1666-"Test of flame propagation height of cables installed vertically in the middle"

CM/CMG: Generic Communication Wiring. This is common in horizontal cabling of buildings, which are typically divided into smaller bundles than CMR cables. CM/CMG cables use halogen-based chemical quality. According to definition, in a small bundle of cables, the CM/CMG cable must be extinguished by itself less than 5 meters after combustion diffusion. The flame is not forcibly burned using a fan. The CM/CMG cable jacket is usually made of a type of PVC, which emits chlorine in the combustion chamber. CM/CMG cables are usually used for horizontal cabling in the UK, Asia, and Australia. CM/CMG cables must undergo csa ft-4 "vertical combustion test"

CMX: Residential Communication Wiring. This type of cable is limited to other small applications with a very small number of residential or communication cables used. These applications generally only lay one cable. CMX-level tools cannot be used for bundled cable applications. CMX-level cables must undergo UL VW1 Combustion Test

Low Smoke Zero Halogen LSZH)

The other security level used in the cabling industry is the low smoke and Zero Halogen LSZH) cable. This security level is classified by ISO/IEC standards and is widely used in Europe.

LSZH and ul cmp are used to test the flame retardant capability and emitted gases. As the name suggests, the combustion LSZH will not emit halide gas, and the smoke is very low. LSZH cables can be used for copper and optical fiber communication cables. The LSZH cables are similar to UL-level cables.