Code Q&A

What is the largest size transformer permitted to be mounted above a suspended ceiling used for environmental air?

Q. What is the largest size transformer permitted to be mounted above a suspended ceiling used for environmental air?

A. Dry-type transformers, rated not more than 50 kVA, are permitted above suspended ceilings or in hollow spaces of buildings, if not permanently closed in by the structure [450.13(B)].

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