Earth is used in electrical equipment
Earth is used in electrical equipment primarily for safety. It provides a path to dissipate fault currents safely into the ground, preventing electric shocks, fires, and damage to equipment. This grounding ensures that in case of a fault, such as a short circuit, excessive current can flow harmlessly away, protecting both people and the electrical system.
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The correct answer is for safety (option C). Earth is used in electrical equipment to provide a safety mechanism. By connecting metal parts of electrical devices and appliances to the ground (earth), any fault current that might energize the metallic casing or other conductive parts is safely directed away from users. This prevents electric shocks and reduces the risk of fires or damage to the equipment. Earth is not used to reduce expenses; its primary function is safety. It is also not related to the equipment operating in 3-phase, which refers to the type of electrical power distribution rather than grounding. While fuses are used for overcurrent protection, they serve a different purpose than grounding, which is specifically designed to protect against electrical faults involving metallic parts and ensure safe operation of electrical systems and devices.