IEC and IEEE standards define common technical, safety and testing requirements for power transformers. When a manufacturer complies, utilities know that insulation levels, temperature limits, dielectric strength, short circuit withstand and efficiency meet internationally accepted criteria. This reduces the risk of failures, ensures interoperability with other grid equipment and simplifies specification and procurement. Compliance also supports consistent testing procedures, documentation and naming conventions, which helps engineers design protection schemes and maintenance plans. For large high voltage units, standards compliance is often a strict legal or contractual requirement in tenders.