导体材料和导电线芯结构的选择
Selection of conductor material and conductor core structure
◆耐火电缆试验时依据GB/T 19216供火温度要达到750+50℃，铜的熔点在1000℃以上，所以可以做耐火电缆的导体。
◆ the fire supply temperature of fire-resistant cable shall reach 750 + 50 ℃ according to GB / T 19216, and the melting point of copper shall be above 1000 ℃, so it can be used as the conductor of fire-resistant cable.
◆不推荐1.0mm2及以下的铜线做耐火电缆 .
◆ copper wire of 1.0mm2 and below is not recommended as fire-resistant cable
◆软结构束线，因导体表面的不光滑平流水槽钢模具 不锈钢铸件 扭王字块模具 井盖钢模具 标志桩模具 调匝式消弧线圈 风冷控制柜 烤漆龙骨整，将对云母带造成极大的损伤，生产出的耐火电缆性能不稳定。
◆ due to the uneven surface of the conductor, the soft structure cable will cause great damage to the mica tape, and the performance of the fire-resistant cable produced is not stable.
◆大截面的电缆扇形芯导体不易做耐火电缆，圆形芯导体适合做耐火电缆
The fan-shaped core conductor of large section cable is not easy to be made into fire-resistant cable, and the round core conductor is suitable for fire-resistant cable