The correct answer is: A. 33kV to 66kV
Resistance grounding is a type of grounding system that uses a resistor to connect the grounding electrode system to the earth. This type of grounding system is used for voltages between 33kV and 66kV.
The purpose of resistance grounding is to limit the current that flows to the earth in the event of a fault. This helps to protect the equipment and personnel from the effects of the fault current.
The resistance of the grounding electrode system is an important factor in the effectiveness of resistance grounding. The lower the resistance, the more effective the grounding system will be.
The grounding electrode system consists of a grounding electrode conductor and a grounding electrode. The grounding electrode conductor is a copper conductor that connects the grounding electrode to the service equipment. The grounding electrode is a conductor that is buried in the earth and provides a low-resistance path for current to flow to the earth.
The grounding electrode system must be installed in accordance with the National Electrical Code (NEC). The NEC provides specific requirements for the size and type of grounding electrode conductor and the location of the grounding electrode.
Resistance grounding is an effective way to protect equipment and personnel from the effects of fault currents. It is important to install the grounding electrode system in accordance with the NEC to ensure that it is effective.
Here is a brief explanation of each option:
- Option A: Resistance grounding is used for voltages between 33kV and 66kV.
- Option B: Resistance grounding is used for voltages between 22kV and 33kV.
- Option C: Resistance grounding is used for voltages between 3.3kV and 11kV.
- Option D: None of the above.