When the ambient exceeds 40 deg. C use the following chart for de-rating standard transformers. Maximum Ambient Temperature Maximum Percentage of Loading 40 deg. C (104 deg. F ) 100% 50 deg. C (122 deg. F) 92% 60 deg. C (140 deg. F) 84% Instead of ordering custom built transformers to operate in ambients higher than 40 deg. C, it is more economical to use a standard transformer of a larger KVA rating.
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