For example, if the motor is drawing 30 amps at 250 volts, you have 30 x 250 x sqrt 3 (about 1.73) = 12,975 watts). Single- phase loads are connected to one leg of the wye between line and neutral. The higher the voltage, the more efficient and powerfull the circuit will be. A motor of a given rated horsepower is expected to deliver that quantity of mechanical power at the motor shaft. 3 Phase in N. America is normally available in 208, 220 or 240 or 480 or 600 volts (Canada). Single-Phase Motors - HP and Full-Load Currents. Amps per leg on three phase?? A 3 phase power outlet will have 3 wires for power, and if it is 220 volts you could measure 220 volts between any combination of the 3 wires. 3 PHASE AMPERES - 80% POWER FACTOR* (Extended Table) kW Times 1000 divided by (Volts*1.73) *.80 This chart approximates the amperage of a generator based on the size of the generator and the load on the generator at 100 percent of capacity. 02-24-2017, 07:36 PM #2. Jraef. What is causing the .6 reading on one leg? Three phase Amps = [HP * 746] / [E * %age Efficiency * PF * 1.73] Example: Determine the current flowing through a three-phase, 2 HP, 400-volt motor having an efficiency rating of 93% and a power … Three phase kW to Amps. The power factor of resistive impedance load is equal to 1. I got 9-.6-9 It sounds good. AC three phase watts to amps calculation Calculation with line to line voltage. I should of checked the voltage. 230 volts motor - 3-phase : 2.5 amps/hp; 460 volts motor - 3-phase : 1.25 amps/hp; Always check nameplate information before designing protective devices, wiring and switch gear. Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). As an example, consider a balanced three phase load consuming 36 kW at a power factor of 0.86 and line to line voltage of 400 V (V LL) : the line to neutral (phase) voltage V LN = 400/√3 = 230 V three phase power is 36 kW, single phase power = 36/3 = 12 kW now simply follow the above single phase method. FORMULAS USED IN CALCULATOR: 1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 1000 Depending on the primary and secondary voltage rating of the “3-phase transformer” and it’s winding configuration, (i.e. Go back to Three phase power measurements ↑ Wye and Delta comparison. Figure 7 – Delta connection – three phase, three wires. Decided to check the amps on a three hp motor. Easy enough. I will do that tomorrow. 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