When is a mechanical permit required for the repair or replacement of a gas or oil furnace not exceeding 20 amps or an electrical furnace or air conditioning unit or refrigeration unit?

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When is a mechanical permit required for the repair or replacement of a gas or oil furnace not exceeding 20 amps or an electrical furnace or air conditioning unit or refrigeration unit?

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Problem: An LHR contractor was under the impression that the only permit needed to do a push/pull on a like-for-like electric furnace was an electrical minor label. A local mechanical inspector informed him that a mechanical permit was also required. He has questioned the need for the mechanical permit and has asked for clarification of this issue.

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