Understanding the Standards Landscape
One of the most common questions we receive from international clients is: "Should I specify IEEE or IEC?" The answer depends on your region, grid requirements, and project specifications.
IEC Standards (International)
The International Electrotechnical Commission (IEC) standards are used across most of the world:
- IEC 60076: Power transformers — general requirements
- IEC 60137: Insulated bushings
- IEC 61936: Power installations exceeding 1 kV AC
IEC standards are the default for projects in the Middle East, Europe, Africa, Asia, and most of South America.
IEEE/ANSI Standards (North America)
The Institute of Electrical and Electronics Engineers (IEEE) standards dominate in North America:
- IEEE C57.12.00: General requirements for distribution and power transformers
- IEEE C57.12.90: Test code for distribution and power transformers
- IEEE C57.91: Loading guide for mineral oil-immersed transformers
Key Technical Differences
ETS Dual-Standard Capability
ETS is one of the few manufacturers globally that designs and tests to both standards simultaneously. Our testing laboratory is accredited to ISO/IEC 17025 and can perform full type tests to either standard.
This dual capability is particularly valuable for:
- EPC contractors working across multiple regions
- Multinational utilities with assets in diverse markets
- Projects funded by international development banks (which may require IEC compliance regardless of local standards)
*Contact our engineering team to discuss standard selection for your next project.*
