This section specifies the definition, requirements, and test methods of twisted pair or star twisted symmetrical cables (hereinafter referred to as cables) for digital communication. The cables specified in this section are applicable to digital communication systems such as local area networks. The definitions and test methods specified in this section are also applicable to symmetrical cables used for wiring in other user buildings. The following normative references are essential for the application of this section. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T2421.1-2008 Environmental Testing for Electrical and Electronic Products - Part 1: Overview and Guidelines (IEC 60068.1, IDT) GB/T 2951.11-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 11: General Test Methods - Measurement of Thickness and Boundary Dimensions - Mechanical Performance Testing (IEC 60811-1-1-2008, IDT) GB/T 2951.12-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 12: General Test Methods - Thermal Aging Test Method (IEC 60811-1-2, IDT) GB/T 2951.13-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 13: General Test Methods - Determination of Density - Water Absorption Test Shrinkage Test (IEC 60811-1-3, IDT) GB/T 2951.14-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 14: General Test Methods - Low Temperature Test (IEC 60811-1-4, IDT) GB/T 2951.31-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 31: Special Test Methods for Polyvinyl Chloride Mixtures - High Temperature Pressure Test - Resistance to Cracking (IEC 60811-3-1, IDT) GB/T 2951.41-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 41: Specific Test Methods for Polyethylene and Polypropylene Mixtures - Environmental Stress Cracking Resistance Test - Melt Index Measurement Method - Direct combustion method for measuring carbon black and mineral filler content in polyethylene - Thermogravimetric analysis (TGA) for measuring carbon black content - Microscopic evaluation of carbon black dispersion in polyethylene (IEC60811-4-1, IDT) GB/T 2951.42-2008 General Test Methods for Insulation and Sheath Materials of Electric and Optical Cables - Part 42: Specific Test Methods for Polyethylene and Polypropylene Mixtures - Tensile Strength and Elongation at Break Test after High Temperature Treatment - Winding Test after High Temperature Treatment - Winding Test after Air Thermal Aging - Determination of Mass Increase - Long term Thermal Stability Test - Copper Catalytic Oxidation Degradation Test Method (IEC 60811-4-2, IDT) GB/T 3953-2009 Round Copper Wire for Electrical Purposes (IEC 60028, NEQ)
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