Overloading of transformers — Cases not covered by the general rules

THE American Standard “Guides for Operation of Transformers and Regulators” C57.3, 1942 and the interim reports on overloading (references 21 and 24) give information which covers many of the overloading conditions encountered with transformers. These rules, however, do not cover every situation. In order to help fill this lack, charts have been prepared which will enable the safety of practically any special case of loading to be determined.