1. 1978 IEEE Standard terminology for power and distribution transformers
2. 1993 IEEE Standard general requirements for liquid-immersed distribution, power, and regulating transformers
3. 1993 IEEE standard test code for liquid-immersed distribution, power, and regulating transformers and IEEE guide for short circuit testing of distribution and power transformers
4. 1995 IEEE guide for loading mineral-oil-immersed transformers