IEC 60279: AC Machine Winding Resistance Measurement — Precision DC Resistance Testing

Why Measuring Motor Winding DC Resistance Has So Many Rules

IEC 60279 specifies AC machine winding DC resistance measurement methods. The four-wire Kelvin method eliminates test lead resistance — critical for large machine windings in the mΩ range. The test also diagnoses turn-to-turn shorts and conductor anomalies.