Cable Sizing Calalculator

Simultaneous Overload
Ignore Group Derating

- only for buried cables
- if in thermal insulation

Tip: registered users can save calculations.

Calulation Notes

Cable sizing compiles with:
 - BS 7671:2008, IEE Wiring Regulations 17th Edition
 - IEC 60364:2001

Cable size is selected as follows:
  1. Cable is calculated on current capacity
  2. Voltage drop is calculated (and cable size increased if necessary)
  3. Fault level withstand is calculated (and cable size increased if necessary)

Tip: if you don't want fault level to be considered, you can set it to a very low value.

To find out more about how the cable sizing tool works, please see:
- Cable Sizing Tool - Notes Post


CPC Sizing

To select or size Circuit Protective Conductors (CPC ), please use our:
 - Circuit Protective Conductor Sizing Tool

Metric AWG Conversion

To convert between Metric and American Wire Gauge, you can use our:
- Metric AWG Conversion Table

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