T/DXDLDQCT 001-2024 额定电压450/750V及以下 聚氯乙烯绝缘阻燃耐火电缆

主要技术内容:6电缆结构的一般要求6.1导体芯数：1芯。导体应符合GB/T 3956和JB/T 8734规定的要求：——第1种实心导体；——第2种绞合导体；——BVR类导体。每根导体20℃时的电阻值不应超过表1、表2及表3中规定的最大值。表1  第1种实心导体标称截面积mm220℃时导体最大电阻Ω/km不镀金属镀金属0.536.036.70.7524.524.81.018.118.21.512.112.22.57.417.5644.614.7063.083.11101.831.84161.151.16250.727—350.524—500.387—700.268—950.193—1200.153—1500.124—1850.101—2400.0775—3000.0620—4000.0465—表2  第2种绞合导体标称截面积mm2导体的最少单线数量20℃时导体最大电阻Ω/km圆形紧压圆形不镀金属镀金属0.57—36.036.70.757—24.524.81.07—18.118.21.57612.112.22.5767.417.564764.614.706763.083.1110761.831.8416761.151.1625760.7270.73435760.5240.529表2  (续）标称截面积mm2导体的最少单线数量20℃时导体最大电阻Ω/km圆形紧压圆形不镀金属镀金属501960.3870.3917019120.2680.2709519150.1930.19512037180.1530.15415037180.1240.12618537300.09910.10024037340.07540.076230061340.06010.060740061530.04700.0475表3  BVR类导体标称截面积mm2导体的最少单线数量20℃时导体最大电阻Ω/km不镀金属镀金属2.5197.417.564194.614.706193.083.1110491.831.8416491.151.1625980.7270.734351330.5240.529501330.3870.391701890.2680.270952590.1930.1951202590.1530.1541503360.1240.1261854270.09910.1006.2绝缘6.2.1材料挤包在导体上