【Daily Topic】【Electrical Edition 20161002】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. The ( ) metal parts of electrical equipment and electrical production facilities do not need to be grounded. A. Supports inside battery rooms with a nominal voltage of 10 kV or less. B. Equipment installed on grounded metal frames (good electrical contact must be ensured). C. The enclosures of electrical measuring instruments, relays, and other low-voltage electrical devices installed on distribution panels, control panels, and switching devices; as well as insulating metal bases that do not generate hazardous voltages when damaged and supported by appropriate structures. D. The enclosures of electrical equipment with an AC nominal voltage of 380 V or less and a DC nominal voltage of 220 V or less, in dry rooms with poorly conductive floors such as wood or asphalt. Correct answer: BC
B. Equipment installed on grounded metal frameworks (good electrical contact must be ensured). C. The enclosures of electrical measuring instruments, relays, and other low-voltage electrical devices installed on distribution panels, control panels, and switching devices, as well as insulating metal bases that prevent the generation of hazardous voltages on supports in the event of damage