The phase rotation meter indicates if the main feed cables to the system are in right rotation or left rotation.

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Multiple Choice

The phase rotation meter indicates if the main feed cables to the system are in right rotation or left rotation.

Explanation:
Phase sequence testing is the idea. A phase rotation meter checks the order of the three phase voltages and tells you whether that order corresponds to right rotation or left rotation. With the correct order, the meter shows one direction; swap two lines, and the sequence reverses, giving the opposite rotation. That’s exactly how you verify that the main feed cables are connected in the proper order for the system. It doesn’t measure voltage or frequency, only the phase sequence.

Phase sequence testing is the idea. A phase rotation meter checks the order of the three phase voltages and tells you whether that order corresponds to right rotation or left rotation. With the correct order, the meter shows one direction; swap two lines, and the sequence reverses, giving the opposite rotation. That’s exactly how you verify that the main feed cables are connected in the proper order for the system. It doesn’t measure voltage or frequency, only the phase sequence.

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