Cable, Breaker & Load Selector
Direct lookup from DEWA Appendix 5 (Tables 1–3) - set any one value and the matching cable size, MCB/MCCB rating and max load current follow, per the standard selection table. Not a calculated/interpolated value - DEWA's tables are discrete rows, so results snap to the nearest listed size. ECC (Appendix 9) is derived from the selected phase conductor size.
Load kW → DEWA Cable & Breaker Selection
Enter the connected/design load. The tool converts kW to current and then selects the next suitable row from the active DEWA Appendix 5 cable/breaker table. The selected table above remains the governing cable type.
Calculated Load Current
-
Recommended Breaker
-
Recommended Cable
-
RCD / ELCB operating current - Appendix 10
Recommended operating current by circuit/equipment type. Match this to whatever circuit the cable/breaker above is feeding.
Notes carried over from Appendix 5:
- Assess initial demand with safe diversity and anticipated future demand before finalising cable size and breaker rating.
- Assess individual fault levels and select MCB/MCCB accordingly - this table does not account for fault-current withstand.
- Refer to manufacturer catalogues for specific applications, considering inductive/capacitive loads, laying conditions, voltage drop and correction factors (grouping, ambient, depth of burial).