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Electricity Technology Daily Question 2018.11.9

2018-11-09View Original

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Exam Paper for Power Safety Procedures (Substation Specialization): For grounding wires, multi-strand copper soft bare wire should be used, and its cross-sectional area must meet the requirements of short-circuit current; however, it shall not be less than ( ) square millimeters. A 15 B 20 C 25 D 30

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