Final answer:
A phase rotation meter determines the rotation sequence of three-phase electrical systems before power is applied, helping prevent damage and ensuring safety and efficiency.
Explanation:
Phase rotation meter is a device used to determine the rotation sequence of three-phase electrical systems before power is applied. It helps ensure that motors and electrical equipment are connected correctly to prevent damage from incorrect phase sequence. By identifying the phase rotation, the meter assists in maintaining the efficiency and safety of electrical systems.
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