A 15kW, 400V 3-phase motor, 50m long, SWA cable, clipped direct. Ibcap I sub b : Incap I sub n : Select 32A Type C MCB. Correction Factors: ), 3 Circuits grouped ( Itcap I sub t Required: Selection: 4mm² SWA ( 36A36 cap A ) is too low. 6mm² SWA ( 46A46 cap A ) is suitable. Voltage Drop: Adiabatic Equation (Short Circuit): to ensure the cable doesn't melt before the device trips. Zscap Z sub s
The voltage drop is within the acceptable limit (≤ 5% of the system voltage). cable calculations bs7671