Calculator route
Resistance & Power Loss (DC)
Estimate conductor resistance for UK-style metric cable sizing and, when needed, add an optional I²R power-loss check.
DC estimate at the supplied temperature. AC effects (skin and proximity) are not modelled.
One-way conductor length in metres.
UK mm² ladder sizes.
Conductor temperature used for resistivity adjustment.
Result
Resistance0.107750Ω
How it's calculated
R = ρ(T) × L / A; power loss = I² × R
Resistivity is temperature-adjusted as ρ(T) = ρ₂₀ × (1 + α × (T − 20)).
- Estimate only — this is guidance, not a compliance verdict.
- Resistivity is temperature-adjusted from 20 °C using a linear approximation.
- DC resistance model only. AC skin/proximity effects are not included.
Formula version: 1.0.0
Continue with ampacity reference or revisit voltage drop.