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What is the maximum surface temperature of a transformers enclosure?

Per NEMA ST-20 (2014):

  • Transformers <= 10 kVA can be up to 65C above ambient with a typical maximum ambient of 25C.
  • Transformers > 10 kVA can be up to 50C above ambient with a typical maximum ambient of 40C.
  • Transformers with lower than standard temperature rises will have lower maximum enclosure temperatures.

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