Which specification requires that the substation grounding main line be connected to the grounding device at two points?
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May I ask: Which specification requires that the substation grounding main line be connected to the grounding device at two points?
This sea friend, let me explain! According to clause 3.3.4 of the standard GB 50169-2006 \"Code for Installation of Electrical Installations – Code for Construction and Acceptance of Grounding Systems\", the grounding main conductors shall be connected to the grounding grid at two or more different points. Natural grounding electrodes should be connected to the grounding main or grounding grid at two or more different points. Or in accordance with clause 6.1.2 of the standard DL/T 621—1997 \"Grounding of AC Electrical Installations\": When natural grounding electrodes and external grounding systems are used, no less than two conductors shall be used to connect to the grounding grid at different locations.