Common neutral earthing methods include solid grounding, resistance grounding (low/high resistance), reactance grounding, and Petersen coil grounding. Selection depends on system voltage level, fault current limitation requirements, arc suppression needs, and protection philosophy. Proper earthing improves fault detection, limits overvoltages, supports selective tripping, and enhances personnel safety. Transmission networks often use reactance or resistance grounding, while distribution systems may use solid grounding for simpler protection.