Low smoke halogen free cable execution standard _clan_ Kelan _ integrated wiring supplier

　　The execution standards of low-SMoke halogen-free cables mainly include the following aspects:

　　I. Main execution standards

　　GB/T 19666-2005: This standard specifies the general requirements for flame retardant and fire-resistant wires and cables, including the relevant requirements for low-smoke halogen-free cables.

　　GB 1 2706.1 2008 and GB/T 1 2706.2 2008: These standards specify requirements for extruded insulated power cables and their accessories for rated voltages from 1 kV to 35 kV, which also cover specific requirements for low-smoke halogen-free cables.

　　JB/T 10491-2004: Although this standard is mainly for specific types of wires and cables, low-smoke halogen-free wires are also manufactured and inspected according to this standard.

　　GB/T 17650.2-1998 and GB/T 17651.2-1998: These two standards specify the test methods for the combustion performance of cables and optical cables under specific conditions, including halogen-free performance and low-smoke performance.

　　Halogen-free and low-smoke performance requirements

　　Halogen-free performance: Low-smoke halogen-free cables should not release halogen-containing gases during combustion, and their halogen-free performance is usually evaluated by measuring the pH value and conductivity of combustion products. For example, the pH-weighted value of halogen-free performance should be greater than or equal to 4.3, and the conductivity-weighted value should be less than or equal to 10us/mm.

　　Low smoke performance: The smoke concentration produced by the cable during combustion should be low, which is usually evaluated by measuring the light transmittance of the combustion products. For example, the light transmittance of the low smoke performance should be greater than or equal to 60%.

　　III. Other technical requirements

　　Flame retardancy: Low-smoke halogen-free cables should have good flame retardancy, which is usually evaluated by bundle combustion tests, including A, B, C and other grades of flame retardant tests.

　　Tensile strength and softness: The tensile strength of low-smoke halogen-free cables is generally higher than that of ordinary PVC wires, and they should also have good softness (hardness is 80-90) to ensure the reliability and durability of the cable during installation and use.

　　Fire resistance: The cable should be able to maintain good performance within a certain temperature range (-30 ° C to 105 ° C) to ensure normal operation under extreme conditions such as fire.

　　IV. Scope of use and recommendations

　　Scope of use: Low-smoke halogen-free cables are suitable for transmission and distribution lines in high-rise buildings, subways, power stations, ships, offshore oil platforms, and telecommunications, computers, etc.

　　Recommendation: When selecting a low-smoke halogen-free cable, ensure that it meets relevant national or industry standards and is selected according to the specific use environment and requirements. At the same time, attention should be paid to the manufacturer's reputation and product quality of the cable to ensure the reliability and safety of the cable.

　　In summary, the execution standards for low-smoke halogen-free cables cover a number of aspects, including main execution standards, halogen-free and low-smoke performance requirements, other technical requirements, and scope of use and recommendations. These standards are designed to ensure that low-smoke halogen-free cables have low smoke concentrations and halogen-free gas emissions when burned, thereby reducing hazards to people and the environment.