Conductor Resistance

Conductor Resistance Calculator

Calculate conductor resistance using the actual conductor cross section, then compare the calculated 20 °C resistance with the IEC 60228 limit selected by nominal cross section.

Standard comparison IEC 60228:2023 Edition 4.0 Copper Class 1, 2, 5, 6 and aluminium Class 1, 2 limits Tables 3, 4, 5 and 6

FORMULA USED

Rt = [L / (γ20 × A)] × [1 + α20 × (t - 20)]

Rt : Resistance at selected temperature

L : Conductor length 1000 m

γ20 : Conductivity at 20 °C 57.5 m/(Ω·mm²)

A : Actual conductor cross section 50 mm²

t : Selected conductor temperature 20 °C

Tref : Reference temperature 20 °C

Conductor Material

Metal / Variant

Conductor Class IEC 60228 conductor class used for the applicable resistance table.

Nominal Cross Section

mm²

Used only to select the applicable IEC 60228 standard resistance limit.

Actual Cross Section

mm²

Used in the resistance calculation formula.

Conductor Length

Conductivity at 20 °C

m/(Ω·mm²)

Default is loaded from DB. You can change this value.

Conductor Temperature

°C

Default 20 °C. You can change this value.

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