Iec 60606 — Pdf [portable]

It is not advised. Modern regulations generally require compliance with the latest "state-of-the-art" (SOTA) standards, which for transformers is the IEC 60076 series . IEC 60606:1978

Formulas for calculating voltage variations under specific load conditions. Transition to Modern Standards iec 60606 pdf

Technical advice on selecting winding configurations for three-phase systems. It is not advised

You can still find the IEC 60606:1978 listing, though it is marked as replaced. though it is marked as replaced.