Cable sizing
Compare a protective-device rating with corrected cable capacity for the installation method you enter.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- Source table: G21; method clipped; cu; xlpe.
- Base temperatures: 30 °C in air, 20 °C in ground. Combined correction factor: 1.
- Uses the smallest available tabulated size satisfying Ib ≤ In ≤ Iz. Unavailable table cells are skipped.
Before using the result
- Check actual cable data, termination temperature limits, voltage drop, fault energy, disconnection time and harmonics before specifying. This table does not verify gland dimensions, support spacing or protection coordination.
Worked example
Illustrative default inputs. Enter your project values above.
- Design load current
- 63 A
- Conductor material
- Copper
- Supply arrangement
- Three phase — balanced
- Combined correction factor
- 1
- Installation method
- C — clipped direct
- Cable construction
- Armoured
- Insulation
- XLPE — 90 °C
Default results
- Conductor candidate
- 10 mm²
- Protective-device candidate
- 63 A
- Corrected cable capacity (Iz)
- 70 A
Choose a reference or send your BOQ
Compare relevant product families, then confirm the exact rating, control supply and duty. Price and availability are confirmed with your enquiry.
Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.