Is it required in a hospital healthcare (Level II Trauma Center) setting that air conditioning equipment serving patient care areas be wired to emergency power?
For emergency treatment areas, the ventilation (supply, return, and exhaust) systems are to connected to the equipment branch of the essential electrical system in accordance with Section 220.127.116.11.5 of the 2012 NFPA 99.
Also see 2017 NEC Article 517.31, and NFPA 110. It is all the essential electrical system, but as Mr. Werner points out it needs to be connected to the equipment branch. I assume that this will be accomplished by using a generator, and NFPA 110 can trigger special requirements for the generator system. Be careful with the new E-stop requirements in 445.18.
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