【Daily Topic】【Electrical Edition 20160928】
Thread Content
Participation reward: 2 Wealth. Reward for the correct answer: 9 Wealth. Which of the following statements is correct? ( ) A. In the TN-C-S system, the protective wire and the neutral wire are not allowed to be connected to each other again starting from the point where they separate.B. Metal mesh from snake pipes, insulation pipes, thin-walled steel pipes, or their outer covers can be used as grounding wires or protective wires.
C. Grounding system: The neutral point of the generator or transformer is either not connected to the grounding device (insulated from the ground), or it is connected to the grounding device through devices with high resistance or high reactance. In the event of a single-phase ground fault, the short-circuit current is very small; hence this system is also known as a low-current grounding system.
D. The grounding and safety design of electrical equipment should be determined based on the characteristics of the project, its scale, development plans, geological conditions, as well as operational and maintenance requirements. Correct answers: AD
A、、、、、、、、、、
The correct statements are (AD). A. In the TN-C-S system, the protective wire and the neutral wire are not allowed to be connected to each other again starting from the point where they separate.
B. Metal mesh from flexible hoses, insulation tubes, thin-walled steel pipes, or their outer covers can be used as grounding wires or protective wires.
C. Grounding system: The neutral point of the generator or transformer is either not connected to the grounding device (insulated from the ground), or it is connected to the grounding device through devices with high resistance or high reactance. In the event of a single-phase ground fault, the short-circuit current is very small; hence this system is also known as a low-current grounding system.
D. The grounding and safety design of electrical equipment should be determined based on the characteristics, scale, development plans of the project, geological conditions, as well as operational and maintenance aspects
B. Metal mesh from flexible hoses, insulation tubes, thin-walled steel pipes, or their outer covers can be used as grounding wires or protective wires.
C. Grounding system: The neutral point of the generator or transformer is either not connected to the grounding device (insulated from the ground), or it is connected to the grounding device through devices with high resistance or high reactance. In the event of a single-phase ground fault, the short-circuit current is very small; hence this system is also known as a low-current grounding system.
D. The grounding and safety design of electrical equipment should be determined based on the characteristics, scale, development plans of the project, geological conditions, as well as operational and maintenance aspects
A. In the TN-C-S system, the protective wire and the neutral wire are not allowed to be connected to each other again starting from the separation point. D. The grounding and safety design of electrical equipment should have a design plan that is determined reasonably based on the characteristics of the project, its scale, development plans, geological conditions, as well as operational and maintenance aspects
AD~~~~~~~~~~
The correct statements are (AD). A. In the TN-C-S system, the protective wire and the neutral wire are not allowed to be connected to each other again starting from the separation point.
B. Metal mesh of flexible hoses, insulation tubes, thin-walled steel pipes, or their outer covers can be used as grounding wires or protective wires.
C. Grounding system: The neutral point of the generator or transformer is either not connected to the grounding device (insulated from the ground), or it is connected to the grounding device through devices with high resistance or high reactance. In the event of a single-phase ground fault, the short-circuit current is very small; hence this system is also known as a low-current grounding system.
D. The grounding and safety design of electrical equipment should be determined reasonably based on the characteristics of the project, its scale, development plans, geological conditions, as well as operational and maintenance aspects
B. Metal mesh of flexible hoses, insulation tubes, thin-walled steel pipes, or their outer covers can be used as grounding wires or protective wires.
C. Grounding system: The neutral point of the generator or transformer is either not connected to the grounding device (insulated from the ground), or it is connected to the grounding device through devices with high resistance or high reactance. In the event of a single-phase ground fault, the short-circuit current is very small; hence this system is also known as a low-current grounding system.
D. The grounding and safety design of electrical equipment should be determined reasonably based on the characteristics of the project, its scale, development plans, geological conditions, as well as operational and maintenance aspects