Tofind the KVA or KW rating (at 0.8PF) for your application, select the 50HZ three phase L-L (line to line) voltage level being utilized. Scan down this column to the current needed for your application (select the next higher current rating for more margin). Scan the row to the left and find the KVA and KW rating needed. Forexample, let’s find the current of a 5 kW motor with an Its 700 Watts × 30 min / 3600 = 350 Wh or 0.35 kWh. With the electricity prices of $0.13 per kWh, the total cost is 0.35 kWh × $0.13/kWh. Thus, a single vacuuming of your apartment costs you $0.05 💵. If you're interested in a recurring usage of utilities such as how much it costs to charge your Tesla, try the electricity cost calculator. Mostresidential electrical systems are 120 volts, so your heater will draw 62.5 amps. However, if you have a 240-volt system, your heater will only draw 31.3 amps. A 7.5 kilowatt (kW) heater will draw about 31.25 amps when it is operating at full capacity. This means that the heater will require a circuit that can handle at least 31.25 amps. Forexample, let’s say you have a circular saw with a power rating of 1500 watts and a voltage rating of 220v. The actual current draw can be calculated using the given formula: Amps = 1500 220V = 6.81amps Amps = 1500 220 V = 6.81 amps. So, in this example, the appliance would draw 6.81 amps of current when connected to the 220-volt Hereis what you can use to convert kilowatts to amperes in such a system. AC Three-Phase Line-to-Line Voltage. In three phase systems, the conversion equation for line-to-line voltage is: 1000 × kW 3–√ × V × PF = Amps 1000 × kW 3 × V × P F = Amps. Suppose you have 10 kilowatts with a power factor of 0.8 and a line-to-line voltage of Well use 220 volts for our calculations. KILOVOLT-AMPERES (kVA) = VOLTS x AMPERES x POWER FACTOR x 2 1000. 220 x 4.7 x 2 = 2068 2068 x .85 = 1757.8 1757.8 / 1000 = 1.76 kW. 3. THREE-PHASE. Given: We have a very large appliance that shows a requirement for a 50-amp 208 VAC receptacle. For this calculation, we will use 21 amps. Calculationwith Line-to-Line Voltage. The formula for converting AC Three Phase Amps to Kilowatts with line-to-line voltage is: P ( k W) = 3 × P F × I ( A) × V L - L ( V) 1000. Where, P (power) in kW (kilowatts) is equal to the square root of 3 times the power factor PF, times the phase current I in A (amps), times the line-to-line RMS OSt2.