NEMA Class I transformers

Stanley Y. Merritt, Stuart D. Chaitkin

Research output: Contribution to journalReview articlepeer-review


Various practical economic effects of transformer selection over a range of efficiency levels at and above the National Electrical Manufacturers Association (NEMA) Class I levels are discussed. NEMA voluntary standards for transformers with medium-voltage primaries and secondary voltage of 600 and below are also discussed. Comparisons of NEMA Class I with standard-efficiency transformers and premium transformers are also presented. Some of the efficiency standards of NEMA Class I such as standard-efficiency liquid designs, premium-efficiency liquid designs and VPI/VPE 150°C standard designs are also studied.

Original languageEnglish (US)
Pages (from-to)39-42
Number of pages4
JournalIEEE Industry Applications Magazine
Issue number2
StatePublished - Mar 2004
Externally publishedYes

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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