20A 120V switch safe max current value is 16A. The load in Watts this switch can safely handle = 16A x 120V = 1920 W. If the current rating is same while we increase the voltage to 240V, then = 16A x 240 = 3840 Watts. (Note: This is example calculation. Use 30A switches, plugs and outlets on 240V supply voltage. Threephase power is vital to many industrial and commercial applications due to its efficiency and ability to handle high loads. Calculating three-phase power requires considering various factors, including voltage, current, and power factor. How do you calculate amps per phase in a 3-phase system? To calculate amps per phase in a three 6kW to Amps Conversion. From our formulas follows that in order to get 6 kilowatts in amps we must know the voltage. Assumed the PF is 0.5, and supposed the voltage is 110 V, we get these result: DC: I = 1000 × 6 kW / 110 V = 54.55 A. AC, Single Phase: I = 1000 × 6 kW / (0.5 × 110 V) = 109.09 A. Wejust need the load's current and voltage requirements (it's indicated in the device's label). Then we multiply them and later divide the result by 1000 to express it in kVA. The formula for a single-phase transformer is: \quad \text {kVA}= \frac {I \cdot V} {1000} kVA = 1000I ⋅ V. And for a three-phase transformer: Entermaximum amps in circuit: Select wire size: 18 AWG 16 AWG 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 900 kcmil 1000 kcmil 1250 kcmil 1500 kcmil 1750 kcmil 2000 kcmil Ina three-phase 120° system, only 3 wires are required to transmit the power that would otherwise require 6 wires. One half of the copper is required and the wire transmission losses will be halved. Figure 1. Three-phase voltage waveform. Figure 2. Three-phase voltage vectors. 100˜ 1A 1A 1A 1A 1A 1A 100˜ 100˜ v 1 v 2 v 3 Figure 3. Thechargers work on a 40-amp circuit, so they use 8AWG copper wires. You can use 10-gauge wires for water heaters because many heaters are rated for 30 amps. Simply put, the amperage is more important than the appliance. If the circuit is 50 amps, 6AWG wire can accommodate most of the devices you want to run on that 50A MagnumPower Circuit Breakers 1200A (CMP-A2), 600V, three-phase, four-wire, 60 Hz. Interrupting Rating • Maximum 65 kA at 600V • Maximum 200 kA at 240V Breaker Options CMP-A1 Device Type Ampere Rating kA Value Mounting 240V 600V Height Main Breakers KD Frame 70-400 b 65-200 25-65 4X A3 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 in N. America is normally available in 208, 220 or 240 or 480 or 600 volts (Canada). The higher the voltage, the more efficient and powerfull the circuit will be. For3 phase power 25 amps at 220v: VA (total apparent power) = 25 x 220 x 1.73 = 9513, or about 9.5 KVA (roughly the same as single phase). - user39367. Dec 10, 2016 at 3:06. 1. This is incorrect. You pay for energy use, not amps, and the only difference in energy use is in the efficiency of the motor. For three phase power you have to D5A20.