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There are many other special requirements in Article 517. One of the more significant ones is the requirement for an "essential electrical system" in some types of healthcare facilities – like hospitals.Article 517: Part III: Essential Electrical System
The essential electrical system is covered by Part III of Article 517. It comprises features of an emergency system as well as a legally required standby system but is treated a little bit differently than in Articles 700 and 701.
The essential electrical system consists of an emergency system and an equipment system. The emergency system consists of a life safety branch and a critical branch. The life safety branch is most like the emergency system described in Article 700, where much of the system is used to help people out of a building in an emergency. In a hospital and some other facilities, the critical branch provides for critical patient care where evacuation or interruption of a procedure may be hazardous to the patient. The equipment branch supplies power to certain equipment that is necessary for continued use of the facility.
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