Which of the following grounding is not practically preferred for protection of equipment:
- Resistance grounding
- Reactance grounding
- Isolated grounding
- All of the above
Correct answer: 3. Isolated grounding
Explanation: Isolated grounding involves grounding equipment separately from the power system ground. This method is not preferred for the protection of equipment because it can lead to floating potentials and increased risk of equipment damage during faults. Isolated grounding is generally not recommended for power distribution systems.