Can a 60 Hz transformers be operated at 50 Hz?

Acme transformers, rated at 60 Hz, below 1 KVA can be used on 50 Hz service.

Transformers 1 KVA and larger, rated at 60 Hz, should not be used on 50 Hz service, due to the higher losses and resultant heat rise. Special designs are required for this service.

However, any 50 Hz transformer will operate on a 60 Hz service.

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