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MV Cable Sizing Calculator

IEC 60287-1-1 · IEC 60287-2-1 · IEC 60287-3-1 — first-principles thermal-circuit current rating for single-core MV/HV cables, cross-checked against CIGRE Technical Brochure 880. v1 scope: single-core, unarmoured, XLPE-insulated, buried (duct or direct) cables. Free-air installation and armoured cables are not yet supported. This calculator is fully free — no subscriber gate.

AAJappsEngineering Calculation Report

MV Cable Sizing Calculator

IEC 60287-1-1/2-1/3-1, CIGRE TB880

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

System

kV
Hz
°C

Conductor

mm
Ω/km

Insulation & sheath build

v1 supports XLPE insulation only (ε=2.5, tanδ=0.001, ρ=3.5 K·m/W — CIGRE-verified).
mm
mm
mm
mm
mm

Sheath bonding

v1 assumes unarmoured cable (λ2 = 0). Armoured-cable circulating/eddy loss is not yet supported.

Installation

mm
K·m/W
°C

Current rating result

Continuous current rating I821.8 A
Conductor temperature θc90.00 °C
Sheath temperature θs78.71 °C
Iterations to converge5

Thermal & loss detail

T1 (conductor → sheath)0.4199 K·m/W
T3 (sheath → armour/serving)0.0867 K·m/W
T4 (cable surface → ambient)1.5947 K·m/W
Sheath loss factor λ1′0.2939
Dielectric loss Wd0.3851 W/m
Capacitance C0.2111 nF/m