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① 有用户提出导线为集束绞合软结构导线,这就要求企业从电缆使用的可靠性出发与用户沟通,改为圆形紧凑型导线。软结构束线和多股绞合容易损坏云母带,不建议作为耐火电缆导体。但也有厂家认为,厂家毕竟应该满足用户对用户需要的任何一种耐火电缆的需求,电缆的细节不是很清楚,电缆与人们的生活息息相关,所以电缆厂家必须向用户说明相关的技术问题。
② 扇形导体的云母带缠绕压力分布不均,不适合使用。从成本上看,扇形导体结构的截面周长比圆形导体大,从而增加了有价值的材料云母带。虽然圆形结构电缆的外径增加,聚氯乙烯护套材料的用量增加,但与总成本相比,产品材料更为全面,圆形结构的电缆仍然节省。北京朝阳电缆厂在此基础上,从技术经济分析,耐火电力电缆的最佳导体为圆形结构。