施工用电的接零或接地保护（Zero or ground protection of construction electricity）.doc

施工用电的接零或接地保护（Zero or ground protection of construction electricity） Ulterior motives, but for mountains and rivers. The waves between the river and the sky surge into the wind and the earth. Apple of Sodom. The country people, hunger breeds discontentment. I lost my proud Yang Jun Shiliu, Willow Stream straight on the high nine. This article is contributed by hre207 DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Zero or ground protection of construction electricity In the construction engineering construction in accordance with the JGJ46-88 construction site temporary electrical safety technical specifications requirement, the construction site of the temporary power supply project should adopt the neutral point with special protective zero line, directly grounded three-phase four wire power supply system. Three-phase five wire system. Here is a case in the construction site of the special (special transformer) power neutral directly grounded three-phase four wire power supply system. According to GB50194-93 construction site for electrical safety standards, in the same power supply system should not be used at the same time zero protection or protective earthing system, if the direct connection from the public transformer, the construction site uses the power of neutral point has special protective zero line, directly grounded three-phase four wire power supply system can the. At the same time, the specification stipulates that when the construction site and the external power line share the same power supply system, the electrical equipment should be protected according to local requirements, zero or protective earthing. No part of the equipment shall be used for protective earthing and another part shall be used as protective earthing. To this end, the construction of the power supply in accordance with the construction site to take the protection of zero or p