【Joint Study*】【Electrical Version 20160301】
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Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. The ( ) metal parts of electrical equipment and electrical production facilities may not be grounded. A. Supports inside battery rooms with a nominal voltage of 10 kV or less. 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 do not generate hazardous voltages when damaged and are supported in appropriate ways. 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 poor conductive floors such as wood or asphalt
I choose C: the enclosures for electrical measuring instruments, relays, and other low-voltage electrical devices installed on distribution panels, control panels, and switching devices; as well as the insulated metal bases that prevent dangerous voltages from appearing on the supports in case the enclosure is damaged
The (B.C.) metal parts of electrical equipment and electrical production facilities may not be grounded. A. Supports inside battery rooms with a nominal voltage of 10 kV or less. 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 do not generate hazardous voltages when damaged and are supported in appropriate ways. 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 poor conductive floors such as wood or asphalt
BC~~~~~~~~~~~~~
B. Equipment installed on grounded metal frames (ensuring good electrical contact). 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 insulated metal bases that prevent the generation of dangerous voltages on supports in the event of damage