Calculate single-phase power, current and cable loading from load and power factor.
Current is the load divided by voltage, power factor and efficiency, since each reduces the useful output for a given current. Protective devices are sized above full-load current to avoid nuisance tripping. A 3.5 kW load at 230 V draws about 16 A, which is why domestic ring circuits and appliance ratings cluster around that figure.
Single Phase Power
I = P ÷ (V × power factor × efficiency)
I = P ÷ (V × power factor × efficiency) Current is the load divided by voltage, power factor and efficiency, since each reduces the useful output for a given current. Protective devices are sized above full-load current to avoid nuisance tripping.
A 3.5 kW load at 230 V draws about 16 A, which is why domestic ring circuits and appliance ratings cluster around that figure.
This calculator takes 4 inputs: Supply voltage, Load, Power factor, Load efficiency. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.