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分析等电位联接线、接地干线、保护导体的功能以及材质和截面选择,明确其间的异同和关系,目前高层建筑中设置的“保护接地干线”实际上只起到等电位联接线和方便接地的作用,作用有限,更不能完全代替TN-S接地系统中的PE线。可以采用共用保护导体的做法,以其取代干线电缆中PE线的作用,用四芯电缆代替五芯电缆,达到节能减排的目的。
Analysis of equipotential bonding lines, grounding trunks, the function of the protective conductor and material and cross-section selection, clear the similarities and differences and the relationship between the current high-rise buildings set up “protective earth trunk” actually only equipotential bonding line and convenient The role of grounding, limited role, but can not completely replace the PE line TN-S grounding system. Can be used to protect the conductor in common practice, with its replacement of trunk cable PE line role, with four-core cable instead of five-core cable, to achieve energy-saving emission reduction purposes.