【Daily Topic】【Electrical Edition 20160929】
Thread Content
Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. The regulations regarding the grounding of electrical installations are ( ). A. The grounding devices should be interconnected to form a grounding grid. Adjacent buildings that are no more than 30m apart should also be connected. B. The grounding wires of the valve-type surge arresters installed on each overhead line leading to the distribution equipment room should be connected to the grounding system of that room; there is no need to install a separate centralized grounding system. C. When electrical devices such as distribution transformers are installed in the distribution equipment room located within the building they supply power to, their grounding systems should be connected to the rebar in the building’s foundation. D. The grounding systems for outdoor pole-mounted distribution transformers and other similar electrical devices should be arranged in a closed loop around the transformer. Correct answers: CD
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C. When electrical devices such as distribution transformers are installed in a distribution panel room located within the building they supply power to, their grounding systems should be connected to the reinforcement bars of the building’s foundation. D. The grounding systems of outdoor pole-mounted distribution transformers and other such electrical devices should preferably be arranged in a closed loop around the transformer