【Daily Topic】【Electrical Edition 20160901】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. The requirements that must be met regarding indirect contact protection for electrical equipment in elevator machine rooms, carriages, and shafts are ( ). A. The electrical equipment in the machine room and cab, the metal components in the shaft, as well as the electrical equipment in the building shall all be protected using the same grounding method; it is not necessary to install separate grounding devices. B. All metal components of the elevator installation should be connected to each other at equal potential. C. If cable conductors are used for the cab’s grounding wires, there must be no fewer than two such conductors; when copper conductors are used, the cross-sectional area of each conductor must be at least 2.0 mm². D. 2P+PE type power sockets should be installed in the cab top, machine room, pulley room, and pit. Correct answers: AB
The answer seems to be A and B.
The requirements for indirect contact protection of electrical equipment in elevator machine rooms, carriages, and shafts shall be those specified in (AB). A. The electrical equipment in the machine room and cab, the metal components in the shaft, and the electrical equipment in the building shall be protected using the same grounding system; there is no need to install separate grounding devices. B. All metal components of the elevator installation shall be connected to each other at equal potential. C. If cable conductors are used for the cab’s grounding wire, there must be no fewer than two such conductors; when copper conductors are used, the cross-sectional area of each conductor must be at least 2.0 mm². D. 2P+PE type power sockets shall be installed on the cab top, in the machine room, in the pulley room, and in the pit
A. The electrical equipment in the machine room and car, the metal components in the shaft, and the electrical equipment in the building shall all be protected using the same grounding system; it is not necessary to install separate grounding devices. B. All metal components of the entire elevator installation should be connected to each other at equal potential
B. The metal components of the entire elevator installation shall be connected to each other at equal potential
A. The electrical equipment in the machine room and elevator car, the metal components in the shaft, and the electrical equipment in the building are protected using the same grounding system; it is not necessary to install separate grounding devices
The requirements for indirect contact protection of electrical equipment in elevator machine rooms, carriages, and shafts shall be those specified in (AB). A. The electrical equipment in the machine room and cab, the metal components in the shaft, and the electrical equipment in the building shall all be protected using the same grounding system; there is no need to install separate grounding devices. B. All metal components of the elevator installation shall be connected to each other at equal potential. C. If cable conductors are used for the cab’s grounding wires, there must be no fewer than two such conductors; when copper conductors are used, the cross-sectional area of each conductor must be at least 2.0 mm². D. 2P+PE type power sockets shall be installed on the cab top, in the machine room, in the pulley room, and in the pit