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First we convert horsepower to watts. 1 Horsepower equals 745.7 watts. Next, using the Ohm's law formula P=IxE where P is power measured in watts; I is current measured in amps; E is voltage measured in volts.

Therefore

5(745.7) / 240 = 15.5 amps

<<>> The current taken by a motor is highly variable depending on efficiency, power factor and the mechanical load. On a 240 v system you should allow 7 amps per HP. So for 5 HP you should allow 35 amps.

Since 2-phase systems went out of use 100 years ago you probably have a single-phase motor which has two suppy wires, a live and a neutral, plus probably an earth wire.

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