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What is the number of wattmeter required to measure the power of a poly phase of a poly phase system containing ‘n’ conductors?

What is the number of wattmeter required to measure the power of a poly phase of a poly phase system containing ‘n’ conductors? Correct Answer n - 1

According to Blondell’s theorem the no. of watt meters to be required to measure the total power in n-phase system is either N (or) N - 1.

When separate neutral wire is available in the system the no. of watt meters to be required is N. When the neutral wire is not available in the system, then the no. of watt meters to be required is (N - 1). One line is acts as a common line for return path.

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