Power System
Three Phase Current
I = P / (\sqrt{3} \times V \times PF)
Variables
| I | Line current | A |
| P | Active power | W |
| V | Line-to-line voltage | V |
| PF | Power factor | - |
Engineering Example
A 30 kW, 400 V three-phase load at PF 0.85 draws I = 30000 / (1.732 x 400 x 0.85) ≈ 51 A.
Practical Site Example
Used to size the feeder breaker and cable for a three-phase distribution board.