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When the working ground of the low-voltage system, the protective ground for the exposed conductive parts of electrical equipment, and the lightning protection ground in the same building share the same grounding device, the maximum allowable value of the grounding resistance of that grounding device shall be ( ). A. The maximum of the three B. The minimum of the three C. The average of the three D. Unable to determine (B)
When the working ground of the low-voltage system, the protective ground for the exposed conductive parts of electrical equipment, and the lightning protection ground in the same building share the same grounding device, the maximum allowable value of the grounding resistance of that grounding device should be (B). A. The maximum of the three B. The minimum of the three C. The average of the three D. Cannot be determined
B. The minimum of the three~~~~~~~~~~~~~~~~~~~~
When the working ground of the low-voltage system, the protective ground for the exposed conductive parts of electrical equipment, and the lightning protection ground in the same building share the same grounding device, the maximum allowable value of the grounding resistance of that grounding device should be (B). A. The maximum of the three B. The minimum of the three C. The average of the three D. Cannot be determined
When the working ground of the low-voltage system, the protective ground for the exposed conductive parts of electrical equipment, and the lightning protection ground in the same building share the same grounding device, the maximum allowable value of the grounding resistance of that grounding device shall be (B. the minimum value of the three).
When the working ground of the low-voltage system, the protective ground for the exposed conductive parts of electrical equipment, and the lightning protection ground in the same building share the same grounding device, the maximum allowable value of the grounding resistance of that grounding device should be (B). A. The maximum of the three B. The minimum of the three C. The average of the three D. Cannot be determined