What are the special electrical requirements for healthcare facilities per NEC Article 517?

Healthcare facilities require: Essential Electrical System with Life Safety, Critical, and Equipment branches fed from separate transfer switches; Type 1 (10-second) and Type 2 (delayed) restoration; isolated power systems in wet procedure locations; ground fault indication (not interruption) in patient care areas; equipotential grounding for patient areas with special receptacle testing; emergency lighting with 1.5-hour minimum battery backup; and specific requirements for critical care areas. Selective coordination is mandatory for essential system components.