![]() The easiest way to solve three-phase problems is to convert them to a single-phase problem. In a three-phase system, we have the line to line voltage (V LL) and the phase voltage (V LN), related by: The main difference between a three-phase system and a single-phase system is the voltage. To convert from VA to kVA just divide by 1000. Note: you can do these equations in either VA, V, and A or kVA, kV, and KA depending on the parameters you are dealing with. As an example, consider a load consuming 23 kW of power at 230 V and a power factor of 0.86: The current is simply the kVA divided by the voltage. Given the kW and power factor, the kVA can be easily worked out. The relationship between kVA and kW is the power factor (Pf): The product of the voltage and current is the apparent power and measured in VA (or kVA). The power was taken by a circuit (single or three-phase) is measured in watts W (or kW). by using 3 phase motor cable size calculator we can also get cable size without calculation.Three Phase Current – Calculation Three Phase Power and Current If we have available kw / hp rating of motor or maximum load /sanction load of domestic (light fan connection) then in such case how many mm2 of cable should be used from pole to meter, cab be got through the chart given below. PVC size Cross Section area (mm2)Ĭurrent Rating of cable For single Phase (Amps)Ĭurrent Rating of cable For Three Phase (Amps) by using the above 3 phase motor cable size calculator we can also get cable size without calculation. ![]() If we calculate the current capacity of the motor or get the current capacity from the name plate of the motor, then through the cable size chart given below, we can get the size of the cable (mm2). Now in actual if we look at the chart given below then a 95 mm2 PVC cable would be perfect to use for connecting the motor to the supply point. ![]() So actual current rating shall be- 1.30x 157 amp= 205 amp In the case of copper wire PVC cable derating factor due to the above three causes would be 1.30.
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