IEEE C57.12.00-1993 - Standard General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers.
IEEE C57.98-1993 - Guide for Transformer Impulse Tests.
IEEE C57.91-1995 - Guide for Loading Mineral-Oil-Immersed Transformers.
IEEE C57.12.36-2017 - Standard Requirements for Liquid-Immersed Distribution Substation Transformers.
NEMA ST-20: Dry-Type Transformers for General Applications.