【Daily Topic】【Electrical Edition 20160910】
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Participation reward: 2 Wealth. Reward for the correct answer: 9 Wealth. Which of the following statements is correct? ( ) A. For underwater lights in swimming pools and above-ground tanks, only safety ultra-low voltage power supplies with a nominal voltage of no more than 24V are permitted. B. The residual current protectors installed to prevent electrical fires should have an operating current of not more than 500mA. C. For emergency generator sets, it is recommended to use an IT grounding system. D. The minimum grounding resistance for the independent grounding system of electrical fire suppression systems is 10Ω. Correct answers: BC
B. The residual current devices installed to prevent electrical fires should have an operating current of no more than 500mA. For emergency generator sets, it is recommended to use an IT grounding system
The correct statements are (BC). A. For underwater lights in swimming pools and above-ground tanks, only safety ultra-low voltage power supplies with a nominal voltage not exceeding 24V are permitted. B. The residual current protectors installed to prevent electrical fires should have an operating current of no more than 500mA. C. For emergency generator sets, an IT grounding system is recommended. D. The grounding resistance of the independent grounding system for electrical fire protection systems should be at least 10Ω