煤矿用阻燃通信电缆检验细则

煤矿用阻燃通信电缆检验细则煤矿用阻燃通信电缆1 范围本规范规定了煤矿用阻燃通信电缆（以下简称电缆）的分类与命名、技术要求与试验方法、检 验规则、标志、包装、运输和贮存。本规范适用于煤矿用铜芯聚乙烯绝缘聚氯乙护套固定和移动类通信电缆。2 引用文件下列文件中的有关条款通过引用而成为本规范的条款。凡注日期或版次的引用文件，其后的任何修改单（不包括勘误的内容）或修订版本都不适用于本规范，但提倡使用本规范的各方探讨使用其最新版本的可能性。凡不注日期或版次的引用文件，其最新版本适用于本规范。GB228 金属拉伸试验方法GB239 金属线材扭转试验方法GB2423.4 电工电子产品基本环境试验规程 试验 Db ：交变湿热试验方法GB2900.10 电工名词术语 电线电缆GB/T2951.1 电缆绝缘和护套材料通用试验方法第 1 部分： 通用试验方法第 1 节： 厚度和外形尺寸测量一机械性能试验GB/T2951.2电缆绝缘和护套材料通用试验方法第 1 部分：通用试验方法第 2 节：热老化试验方法GB/T2951.4电缆绝缘和护套材料通用试验方法第 1 部分：通用试验方法第 4 节：低温试验GB/T2951.6 电缆绝缘和护套材料通用试验方法第 3 部分：聚氯乙烯混合料专用试验方法第1 节：高温压力试验抗开裂试验GB/T2952 电缆外护层GB/T2972 镀锌钢丝锌层硫酸铜试验方法GB/T2976 金属线材缠绕试验方法GB/T3048.4 电线电缆电性能试验方法GB/T3048.6 电线电缆电性能试验方法GB/T3048.8 电线电缆电性能试验方法GB/T3048.9 电线电缆电性能试验方法导体直流电阻试验绝缘电阻试验 电压电流法交流电压试验绝缘线芯工频火花试验GB 3082 铠装电缆用镀锌低碳钢丝GB 3953 电工圆铜线GB/T3956 电缆的导体GB 4909 裸电线试验方法GB 5441.2 通信电缆试验方法GB 5441.6 通信电缆试验方法GB 5441.7 通信电缆试验方法GB 6995 电线电缆识别标志GB 8170 数值修约规则GB 8815工作电容试验电桥法串音衰减试验比较法衰减常数试验开短路法电线电缆用软聚氯乙烯塑料MT386 煤矿用阻燃电缆阻燃性的试验方法和判定规则MT818.14 1999 煤矿用阻燃电缆第 3 单元：煤矿用阻燃通信电缆 JB/T8137 电线电缆交货盘3 定义3.1 批批是指一次定货的产品数量。如果一次定货中有不同型号规格的产品，则不同的型号规格应视为不同 的批。型式试验（T）型式试验是制造厂在供应电缆规范中规定的某一种电缆之前所进行的试验。其特点是，在做过一次试 验后一般不再重做，但在电缆所用材料、结构和工艺有了变更而影响电线电缆的性能时，必须重复进行试验; 或者在产品中另有规定，如定期进行试验等，也应按规定重复进行试验。3.3 抽样试验（S）抽样试验是制造厂按制造批量抽取完整的电缆并从其上切取试样或元件进行的试验。3.4 例行试验（R）例行试验也称出厂检验，是制造厂对全部成品电缆进行的试验。4 产品命名和代号4.1 型号电缆型号见表1表1型 号名称主要使用范围MHYV煤矿用聚乙烯绝缘聚氯乙烯护套通信 电缆用于矿场作普通信号传输，适用于固定 敷设MHYVR煤矿用聚乙烯绝缘聚氯乙烯护套通信 软电缆用于矿场作普通信号传输，可移动使用MHYVP煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯 护套通信电缆用于电场干扰较大的场所作信号传输， 适用于固定敷设MHYVRP煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯护套通信软电缆用于电场干扰较大的场所作信号传输， 电缆较柔软MHYBV煤矿用聚乙烯绝缘镀锌钢丝编织铠装聚氯乙烯护套通信电缆用于机械冲击较高的场合作主信号传输MHY32煤矿用聚乙烯绝缘钢丝铠装聚氯乙烯 护套通信电缆用于平巷、竖井或斜井作主信号传输4.2 规格电缆规格应符合表2的规定。4.3 命名代号4.3.1 系列代号MH4.3.2 材料特征代号铜导体省略聚乙烯绝缘Y聚乙烯内护套省略表2型号标称截面 mm20.751.01.50.751.01.5芯娄对娄MHYV27210MHYVR27210MHYVP27210MHYVRP27210MHYBV27210MHY32一37219聚氯乙烯外护套V细圆钢丝铠装、聚氯乙烯外护层324.3.3 结构特征代号编织屏蔽P编织铠装B导电线芯结构柔软R4.4 表示方法4.4.1 产品用型号、规格表示。例如： 煤矿用铜芯聚乙烯绝缘聚氯乙烯护套通信电缆，2芯1.5mm2 (1/1.38或7芯0.75mm2 (7/0.37),适用于固定场合使用和2对1.5mm2 (48/0.2),适用于移动场合使用，表示为:MHYV 1x2x1.5 (1/1.38)或 MHYV 1x7x0.75 (7/0.37)MHYVR 2x2x1.5 煤矿用铜芯聚乙烯绝缘编织屏蔽聚氯乙烯护套通信电缆，4芯1.5mm2 (7/0.52)威3对0.75mm2(1/0.97),适用于固定场合使用和5对1.0mm2 (32/0.2),适用于移动场合使用，表示为：MHYVP 1x4x1.5 (7/0.52)或 MHYVP 3x2x0.75 (1/0.97)MHYVRP 5x2x0.75 煤矿用铜芯聚乙烯绝缘编织铠装聚氯乙烯护套通信电缆，4芯1.5mm2 (1/1.38)或2对1.0mm2(7/0.43和 7 X1.5mm2 (48/0.2), 表示为：MHYBV 1x4x1.5 (1/1.38)或 2x2x1.0 (7/0.43)和 7x2x1.5 (48/0.2) 煤矿用铜芯聚乙烯绝缘细钢丝铠装聚氯乙烯护套通信电缆，5芯1.5mm2 (1/1.38)或19对1.0mm2(7/0.43和10对0.75mm2 (7/0.37)适用于固定场合使用，表示为：MHY32 1x5x1.5 (1/1.38)或 19x2x1.0 (7/0.43)和 10x2x0.75 (7/0.37)5 技术要求与试验方法5.1 导体5.1.1 导体材料应符合GB3953的要求。5.1.2 导电线芯应采用GB/T3956中第1、第2、或第5、第6种导体，导体结构如表3所示。5.1.3 导体表面应光洁、无油污、无损伤绝缘的毛刺、锐边以及凸起或断裂的单线。5.1.4 20c时电缆导体的直流电阻应符合表3的要求。表3标称截面2 mm2导体结构20 C时导体直流电阻/km 种类根数/单线标称直径mm0.7511/0.9724.527/0.3724.5642/0.1526.01.011/1.1318.127/0.4318.1532/0.2019.51.511/1.3812.127/0.5212.1548/0.2013.35.2绝缘5.2.1绝缘采用低密度聚乙烯电缆料，其性能应符合本规范附录 A的要求。5.2.2绝缘应紧密挤包在导体上，且应容易剥落而不损伤导体。绝缘表面应光滑，色泽均匀，不应有裂 缝及其他损伤。5.2.3绝缘标称厚度应符合表4表9的规定。表4 MHYV型煤矿用聚乙烯绝缘聚氯乙烯护套通信电缆规格导体种类绝缘标称厚度mm外护套标称厚度mm电缆外径 mm1x2x0.7510.51.68.51x2x0.7520.51.68.51x2x1.010.51.68.71x2x1.020.61.69.21x2x1.510.51.69.01x2x1.520.61.69.81x3x0.7510.51.68.51x3x0.7520.51.68.81x3x1.010.51.69.01x3x1.020.61.69.61x3x1.510.51.69.41x3x1.520.61.610.2规格导体种类绝缘标称厚度mm外护套标称厚度mm电缆外径 mm1x4x0.7510.51.69.01x4x0.7520.51.69.31x4x1.010.51.69.51x4x1.020.61.610.21x4x1.510.51.610.01x4x1.520.61.611.01x5x0.7510.51.69.61x5x0.7520.51.610.01x5x1.010.51.610.01x5x1.020.61.611.01x5x1.510.51.610.71x5x1.520.61.611.71x6x0.7510.51.610.21x6x0.7520.51.610.61x6x1.010.51.610.81x6x1.020.61.611.71x6x1.510.51.611.51x6x1.520.61.612.51x7x0.7510.51.610.21x7x0.7520.51.610.61x7x1.010.51.610.81x7x1.020.61.611.71x7x1.510.51.611.51x7x1.520.61.612.52x2x0.7510.51.610.72x2x0.7520.51.611.22x2x1.010.51.611.42x2x1.020.61.612.52x2x1.510.51.612.12x2x1.520.61.613.43x2x0.7510.51.611.23x2x0.7520.51.611.73x2x1.010.51.612.0规格导体种类绝缘标称厚度mm外护套标称厚度mm电缆外径 mm3x2x1.020.61.613.13x2x1.510.51.612.73x2x1.520.61.614.04x2x0.7510.51.612.14x2x0.7520.51.612.74x2x1.010.51.613.04x2x1.020.61.614.24x2x1.510.51.613.74x2x1.520.61.615.25x2x0.7510.51.613.05x2x0.7520.51.613.65x2x1.010.51.613.85x2x1.020.61.615.35x2x1.510.51.614.95x2x1.520.61.616.57x2x0.7510.51.614.07x2x0.7520.51.614.77x2x1.010.51.614.97x2x1.020.61.616.67x2x1.510.51.616.87x2x1.520.61.618.010x2x0.7510.51.617.210x2x0.7520.51.618.210x2x1.010.52.020.210x2x1.020.62.022.510x2x1.510.52.022.010x2x1.520.62.024.0表5 MHYVR型煤矿用聚乙烯绝缘聚氯乙烯护套通信软电缆规格导体种类绝缘标称厚度mm护套标称厚度mm电缆外径 mm1x2x0.7560.51.68.51x2x1.050.61.69.31x2x1.550.61.610.01x3x0.7560.51.68.91x3x1.050.61.69.71x3x1.550.61.610.41x4x0.7560.51.69.41x4x1.050.61.610.41x4x1.550.61.611.11x5x0.7560.51.610.01x5x1.050.61.611.11x5x1.550.61.612.01x6x0.7560.51.610.71x6x1.050.61.612.01x6x1.550.61.612.81x7x0.7560.51.610.71x7x1.050.61.612.01x7x1.550.61.612.82x2x0.7560.51.611.32x2x1.050.61.612.62x2x1.550.61.613.73x2x0.7560.51.612.03x2x1.050.61.613.33x2x1.550.61.614.44x2x0.7560.51.612.84x2x1.050.61.614.44x2x1.550.61.615.65x2x0.7560.51.613.85x2x1.050.61.615.65x2x1.550.61.617.07x2x0.7560.51.615.07x2x1.050.61.616.87x2x1.550.61.618.3规格导体种类绝缘标称厚度mm护套标称厚度mm电缆外径 mm10x2x0.7560.51.618.410x2x1.050.62.022.810x2x1.550.62.025.0表6 MHYVP型煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯护套通信电缆规格导体种类绝缘标称厚度mm内护套标称厚度mm编织单线直径mm外护套标称厚度mm电缆外径 mm1x2x0.7510.51.50.151.611.81x2x0.7520.51.50.151.612.11x2x1.010.51.50.151.612.11x2x1.020.61.50.151.612.81x2x1.510.51.50.151.612.61x2x1.520.61.50.151.613.41x3x0.7510.51.50.151.612.01x3x0.7520.51.50.151.612.41x3x1.010.51.50.151.612.61x3x1.020.61.50.151.613.21x3x1.510.51.50.151.613.01x3x1.520.61.50.151.613.81x4x0.7510.51.50.151.612.61x4x0.7520.51.50.151.613.01x4x1.010.51.50.151.613.21x4x1.020.61.50.151.614.01x4x1.510.51.50.151.613.61x4x1.520.61.50.201.614.71x5x0.7510.51.50.151.613.21x5x0.7520.51.50.151.613.51x5x1.010.51.50.151.613.61x5x1.020.61.50.201.614.81x5x1.510.51.50.201.614.51x5x1.520.61.50.201.615.51x7x0.7510.51.50.201.614.81x7x0.7520.51.50.201.614.2规格导体种类绝缘标称厚度mm内护套标称厚度mm编织单线直径mm外护套标称厚度mm电缆外径 mm1x7x1.010.51.50.201.614.41x7x1.020.61.50.201.615.51x7x1.510.51.50.201.615.21x7x1.520.61.50.201.616.32x2x0.7510.51.50.201.614.52x2x0.7520.51.50.201.615.02x2x1.010.51.50.201.615.22x2x1.020.61.50.201.616.32x2x1.510.51.50.201.616.02x2x1.520.61.50.201.617.23x2x0.7510.51.50.201.615.03x2x0.7520.51.50.201.615.53x2x1.010.51.50.201.615.63x2x1.020.61.50.201.617.03x2x1.510.51.50.201.616.73x2x1.520.61.50.201.618.04x2x0.7510.51.50.201.616.04x2x0.7520.51.50.201.616.54x2x1.010.51.50.201.616.74x2x1.020.61.50.201.618.04x2x1.510.51.50.201.617.84x2x1.520.61.50.201.619.25x2x0.7510.51.50.201.617.05x2x0.7520.51.50.201.617.55x2x1.010.51.50.201.617.85x2x1.020.61.50.201.619.45x2x1.510.51.50.201.618.85x2x1.520.61.50.202.022.07x2x0.7510.51.50.201.618.07x2x0.7520.51.50.201.618.87x2x1.010.51.50.201.619.07x2x1.020.61.50.202.021.57x2x1.510.51.50.202.021.4规格导体种类绝缘标称厚度mm内护套标称厚度mm编织单线直径mm外护套标称厚度mm电缆外径 mm7x2x1.520.61.50.202.023.510x2x0.7510.51.50.202.023.010x2x0.7520.51.50.202.023.810x2x1.010.51.50.202.024.010x2x1.020.61.50.202.026.810x2x1.510.51.50.202.025.510x2x1.520.61.50.202.028.2表7 MHYVRP型煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯护套通信软电缆规格导体种类绝缘标称厚度mm内护套标称厚度mm编织单线直径mm外护套标称厚度mm电缆外径 mm1x2x0.7560.51.50.151.612.11x2x1.050.61.50.151.613.01x2x1.550.61.50.151.613.51x3x0.7560.51.50.151.612.51x3x1.050.61.50.151.613.31x3x1.550.61.50.151.614.01x4x0.7560.51.50.151.613.01x4x1.050.61.50.151.614.01x4x1.550.61.50.201.615.01x5x0.7560.51.50.151.613.81x5x1.050.61.50.201.615.01x5x1.550.61.50.201.616.01x7x0.7560.51.50.201.614.61x7x1.050.61.50.201.615.81x7x1.550.61.50.201.616.82x2x0.7560.51.50.201.615.22x2x1.050.61.50.201.616.52x2x1.550.61.50.201.617.53x2x0.7560.51.50.201.615.63x2x1.050.61.50.201.617.03x2x1.550.61.50.201.618.24x2x0.7560.51.50.201.616.5规格导体种类绝缘标称厚度mm内护套标称厚度mm编织单线直径mm外护套标称厚度mm电缆外径 mm4x2x1.050.61.50.201.618.04x2x1.550.61.50.201.619.55x2x0.7560.51.50.201.617.65x2x1.050.61.50.201.619.05x2x1.550.61.50.202.021.57x2x0.7560.51.50.201.618.47x2x1.050.61.50.202.022.47x2x1.550.61.50.202.023.210x2x0.7560.51.50.202.023.410x2x1.050.61.50.202.026.010x2x1.550.61.50.202.028.0表8 MHYBV型煤矿用聚乙烯绝缘镀锌钢丝编织铠装聚氯乙烯护套通信电缆规格导体种类绝缘标称厚度mm内护套标称厚度mm编织钢丝直径mm外护套标称厚度mm电缆外径 mm1x2x0.7510.51.50.250.301.611.81x2x0.7520.51.50.250.301.612.71x2x0.7560.51.50.250.301.612.71x2x1.010.51.50.250.301.612.71x2x1.020.61.50.250.301.613.41x2x1.050.61.50.250.301.613.51x2x1.510.51.50.250.301.613.21x2x1.520.61.50.250.301.614.01x2x1.550.61.50.250.301.614.21x3x0.7510.51.50.250.301.612.71x3x0.7520.51.50.250.301.613.01x3x0.7560.51.50.250.301.613.11x3x1.010.51.50.250.301.613.01x3x1.020.61.50.250.301.613.81x3x1.050.61.50.250.301.614.01x3x1.510.51.50.250.301.613.61x3x1.520.61.50.250.301.614.41x3x1.550.61.50.250.301.614.6规格导体种类绝缘标称厚度mm内护套标称厚度mm编织钢丝直径mm外护套标称厚度mm电缆外径 mm1x4x0.7510.51.50.250.301.613.21x4x0.7520.51.50.250.301.613.51x4x0.7560.51.50.250.301.613.71x4x1.010.51.50.250.301.613.61x4x1.020.61.50.250.301.614.51x4x1.050.61.50.250.301.614.61x4x1.510.51.50.250.301.614.21x4x1.520.61.50.250.301.615.11x4x1.550.61.50.250.301.615.31x5x0.7510.51.50.250.301.613.81x5x0.7520.51.50.250.301.614.21x5x0.7560.51.50.250.301.614.41x5x1.010.51.50.250.301.614.31x5x1.020.61.50.250.301.615.21x5x1.050.61.50.250.301.615.31x5x1.510.51.50.250.301.614.91x5x1.520.61.50.250.301.615.91x5x1.550.61.50.250.301.616.21x6x0.7510.51.50.250.301.614.41x6x0.7520.51.50.250.301.614.81x6x0.7560.51.50.250.301.615.01x6x1.010.51.50.250.301.614.91x6x1.020.61.50.250.301.615.91x6x1.050.61.50.250.301.616.11x6x1.510.51.50.250.301.615.61x6x1.520.61.50.250.301.616.71x6x1.550.61.50.250.301.617.01x7x0.7510.51.50.250.301.614.41x7x0.7520.51.50.250.301.614.81x7x0.7560.51.50.250.301.615.01x7x1.010.51.50.250.301.614.91x7x1.020.61.50.250.301.615.91x7x1.050.61.50.250.301.616.1规格导体种类绝缘标称厚度mm内护套标称厚度mm编织钢丝直径mm外护套标称厚度mm电缆外径 mm1x7x1.510.51.50.250.301.615.61x7x1.520.61.50.250.301.616.71x7x1.550.61.50.250.301.617.02x2x0.7510.51.50.250.301.615.02x2x0.7520.51.50.250.301.615.42x2x0.7560.51.50.250.301.615.62x2x1.010.51.50.250.301.615.22x2x1.020.61.50.250.301.616.72x2x1.050.61.50.250.301.616.82x2x1.510.51.50.250.301.616.32x2x1.520.61.50.250.301.617.62x2x1.550.61.50.250.301.618.03x2x0.7510.51.50.250.301.615.53x2x0.7520.51.50.250.301.616.03x2x0.7560.51.50.250.301.616.23x2x1.010.51.50.250.301.616.03x2x1.020.61.50.250.301.617.33x2x1.050.61.50.250.301.617.53x2x1.510.51.50.250.301.617.03x2x1.520.61.50.250.301.618.33x2x1.550.61.50.250.301.618.64x2x0.7510.51.50.250.301.616.34x2x0.7520.51.50.250.301.617.04x2x0.7560.51.50.250.301.617.04x2x1.010.51.50.250.301.617.04x2x1.020.61.50.250.301.618.44x2x1.050.61.50.250.301.618.64x2x1.510.51.50.250.301.618.04x2x1.520.61.50.250.301.619.54x2x1.550.61.50.250.301.620.05x2x0.7510.51.50.250.301.617.35x2x0.7520.51.50.250.301.618.05x2x0.7560.51.50.250.301.618.2规格导体种类绝缘标称厚度mm内护套标称厚度mm编织钢丝直径mm外护套标称厚度mm电缆外径 mm5x2x1.010.51.50.250.301.618.05x2x1.020.61.50.250.301.619.65x2x1.050.61.50.250.301.619.85x2x1.510.51.50.250.301.619.25x2x1.520.61.50.250.302.022.65x2x1.550.61.50.250.302.023.07x2x0.7510.51.50.250.301.618.37x2x0.7520.51.50.250.301.619.07x2x0.7560.51.50.250.301.619.27x2x1.010.51.50.250.301.619.17x2x1.020.61.50.250.302.022.77x2x1.050.61.50.250.302.023.07x2x1.510.51.50.250.302.022.07x2x1.520.61.50.250.302.024.07x2x1.550.61.50.250.302.024.510x2x0.7510.51.50.250.302.023.510x2x0.7520.51.50.250.302.024.210x2x0.7560.51.50.250.302.024.510x2x1.010.51.50.250.302.024.310x2x1.020.61.50.250.302.026.810x2x1.050.61.50.250.302.027.010x2x1.510.51.50.250.302.026.010x2x1.520.61.50.250.302.028.510x2x1.550.61.50.250.302.029.2表9 MHY32型煤矿用聚乙烯绝缘细圆钢丝铠装聚氯乙烯护套通信电缆规格导体种类绝缘标称厚度mm内护套标称厚度mm铠装钢丝直径mm外护套标称厚度mm电缆外径 mm1x3x1.010.51.50.81.814.01x3x1.020.61.50.81.814.61x3x1.510.51.50.81.814.51x3x1.520.61.50.81.815.31x4x1.010.51.50.81.814.5规格导体种类绝缘标称厚度mm内护套标称厚度mm铠装钢丝直径mm外护套标称厚度mm电缆外径 mm1x4x1.020.61.50.81.815.51x4x1.510.51.50.81.815.21x4x1.520.61.50.81.816.21x5x1.010.51.50.81.815.21x5x1.020.61.50.81.816.21x5x1.510.51.50.81.815.81x5x1.520.61.50.81.816.81x7x1.010.51.50.81.815.81x7x1.020.61.50.81.816.81x7x1.510.51.50.81.816.51x7x1.520.61.50.81.817.62x2x0.7510.51.50.81.815.82x2x0.7520.51.50.81.816.22x2x1.010.51.50.81.816.32x2x1.020.61.50.81.817.52x2x1.510.51.50.81.817.22x2x1.520.61.50.81.818.43x2x0.7510.51.50.81.816.33x2x0.7520.51.50.81.816.83x2x1.010.51.50.81.817.03x2x1.020.61.51.02.019.03x2x1.510.51.51.02.018.63x2x1.520.61.51.02.020.04x2x0.7510.51.51.02.018.04x2x0.7520.51.51.02.018.64x2x1.010.51.51.02.018.84x2x1.020.61.51.02.019.74x2x1.510.51.51.02.019.64x2x1.520.61.51.02.022.05x2x0.7510.51.51.02.018.45x2x0.7520.51.51.02.019.15x2x1.010.51.51.02.019.25x2x1.020.61.51.02.022.0规格导体种类绝缘标称厚度mm内护套标称厚度mm铠装钢丝直径mm外护套标称厚度mm电缆外径 mm5x2x1.510.51.51.02.021.75x2x1.520.61.51.02.023.37x2x0.7510.51.51.02.019.87x2x0.7520.51.51.02.021.57x2x1.010.51.51.02.021.67x2x1.020.61.51.02.023.47x2x1.510.51.51.22.222.87x2x1.520.61.51.22.225.010x2x0.7510.51.51.22.224.510x2x0.7520.51.51.22.225.810x2x1.010.51.51.22.226.010x2x1.020.61.51.52.529.510x2x1.510.51.51.52.528.810x2x1.520.61.51.52.531.319x2x0.7510.51.51.52.529.319x2x0.7520.51.51.52.530.519x2x1.010.51.51.52.530.619x2x1.020.61.51.52.532.619x2x1.510.51.51.52.532.719x2x1.520.61.51.52.535.85.2.4绝缘厚度的平均值应不小于标称值，其最薄处厚度应不小于标称值的90%0.05mm55.3绝缘性能要求5.3.1绝缘线芯应能经受GB/T3048.9规定的交流50Hz火花试验作为中间检查。试验电压应符合表10的规表10序号绝缘标称厚度8mm火花试验电压kv1S 101012.51.2断裂伸长率（）3003501502热老化试验2.1试验温度（C）90280 2试验时间（h）4x247x24断裂伸长率变化率（%）-35不超过 201.1.1 成对的2根绝缘线芯应采用不同的颜色，普通对为红、白二色，标志对为蓝、白两色；同心式绞合绝 缘线芯颜色应为白、红、黑、黄、蓝、橙、绿、棕。1.1.2 绝缘线对应绞合成线组。5.5 缆芯5.5.1 3芯到8芯的电缆可采用同心式绞合，绞合方向为右向，绞合节径比不大于20倍。一对线芯应采用对 绞，绞合节径比不大于20倍；两对线芯应采用复对绞，绞合节径比不大于25倍。两对及以上的电缆应采用 对绞线组按同心式绞合成缆芯，最外层绞合方向为右向，相邻两层之间的绞向必须相反。同一层中相邻两对 线组应采用不同的绞合节距，外层绞合节径比不大于20倍，每一层中应有一个标志对。5.5.2 绝缘线芯间的间隙允许采用非吸湿性材料填充。5.6 包带5.6.1 电缆的缆芯外面应采用非吸湿性和非吸油性的绝缘带重叠绕包或纵包。绕包带应扎紧，其重叠部分应 不小于带宽的20%,最小不得低于3mm。5.7 内护层5.7.1 内护层采用低密度聚乙烯电缆料，其性能应符合附录A的规定。5.7.2 内护层应紧密挤包在缆芯或绝缘带上，且应容易剥离而不损伤绝缘或绝缘带。内护层平整，无裂缝及 其他机械损伤。5.7.3 内护层的标称厚度应符合表6/9的规定，并允许有20%的负偏差。5.7.4 电缆内护层老化前、后的机械性能应符合表11要求。5.8 编织屏蔽、编织铠装5.8.1 MHYVP、MHYVRP型电缆内护层外应采用圆铜线编织屏蔽。圆铜线应符合 GB3953的规定。其编 织密度应不小于80%。编织用圆铜线的标称直径应符合表6 7中的规定。5.8.2 屏蔽层不允许整体接续，露出的