What are the low smoke halogen free cable execution standards?

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

　　First, domestic standards

　　GB/T 19666-2005

　　This standard may cover certain technical requirements and test methods for low-smoke halogen-free optical cables.

　　GB 1 2706.1 -2008

　　The standard is commonly used for general requirements for wire and cable, and may also apply to some aspects of low smoke halogen-free fiber optic cables. Note, however, that the standard may focus more on Power cables than on fiber optic cables specifically.

　　GB/T 18380.3-2008

　　The standard specifies the terms and definitions, structure, performance requirements, and test methods of low-smoke halogen-free cables, and is the basic basis for the production and application of low-smoke halogen-free cables (including optical cables) in China.

　　GB/T 17650-2008

　　The standard specifies the smoke density test method for low-smoke halogen-free cables, which is of great significance for evaluating the amount of smoke produced by optical cables during combustion.

　　GB 31247-2014

　　The standard may include additional performance requirements for grade B1 halogen-free low-smoke flame retardant cables, such as combustion droplets/particulates, flue gas toxicity, and corrosiveness.

　　II. Industry standards

　　"Technical Specifications for Low Smoke Halogen-Free Cables" (DL/T5261-2005)

　　Developed by the China Electricity Council, the standard provides detailed regulations on the application of low-smoke halogen-free cables in the power industry, and may also be applicable to the application of low-smoke halogen-free cables in power communication.

　　Iii. international standards

　　IEC standard

　　IEC 60502-1: Specifies the structure, performance requirements, and test methods for low-smoke halogen-free cables.

　　IEC 60332-1, IEC 60332-2, and IEC 60332-3 are used to evaluate the flame retardancy of a single cable when tilted and placed vertically.

　　ISO standard

　　ISO 11871: Specifies the smoke density test method for low smoke halogen-free cables.

　　ISO 11925-2: Specifies the vertical combustion test method for low smoke halogen-free cables.

　　IV. Other requirements

　　According to the provisions of GB/T 17651, the minimum light transmittance of the smoke concentration generated by the cable during combustion should not be less than 60%.

　　According to the provisions of GB/T 17650, the emission of halic acid gas generated by the cable during combustion should not exceed 5mg/g.

　　In summary, the execution standards of low-smoke halogen-free optical cables cover many aspects, including domestic standards, industry standards and international standards. Together, these standards ensure that low-smoke halogen-free optical cables have low smoke generation and toxic gas emissions when burned, thus improving their safety and environmental performance in fire situations.