Cable Ampacity Calculator
Calculate the maximum safe current a cable can carry by its cross-sectional area.
°C
Current Capacity
Formulas
- Base ampacity from BS 7671 Table 4D2A (clipped) or 4D5 (conduit)
- Temperature correction: Ca = √((90−Ta)/(90−30))
- Grouping correction: Cg (from table above)
- Design current capacity = Base × Ca × Cg