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为了贯彻节约钢材的指示,应该采用自然导电体作为接零回路。在用电线纲管保护的线路里,电线钢管就是很好的自然导电体,所以应该优先采用作为接零回路。苏联最近的杂志中也一再推荐采用穿线钢管作为接零回路,而且也登载了各种规格钢管的阻抗数据。但是,因为管子的管径、管壁厚度、管子化学成分以及制造方法等都足以影响管子的阻抗值,所以苏联杂志上所刊载的阻
In order to implement the instructions for saving steel, natural electrical conductors should be used as zero-crossing loops. In the line protected by the wire tube, the wire and steel pipe is a very good natural conductor, so it should be used as a zero return circuit. In the Soviet Union’s recent magazine, threading steel pipes were also repeatedly recommended as the zero-crossing loop, and the impedance data of various specifications of steel pipes were also published. However, because the diameter of the pipe, the thickness of the pipe wall, the chemical composition of the pipe, and the manufacturing method are all sufficient to affect the resistance value of the pipe, the resistance published in the Soviet magazine