Answer / murugavel

you measure motor full load current with meter than you will multiply with voltage you find motor power in watts than again you will multiply 0.742 its value for 1hp equal 0.742 watts

Answer / r.k

Accurate can't be possible but approx. HP can be calculated by full load current *Voltage *approx PF(.8 to.9)divide by 746

Answer / prof. dr. k. manjunath

CONDUCT HEAT RUN TEST, PLOT TEMPERATURE TIME CURVE AND THEN
USE RMS POWER METHOD FIND ITS POWER RATING. THEREAFTER YOU
CAN COMPUTE THE HP BY USING THE RELATION 1 HP = 735.5 WATTS

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