Emergency System : (Hcf-ElectrSys) A system of circuits and equipment intended to supply alternate power to a limited number of prescribed functions vital to the protection of life and safety
NFPA 99 Standard for Health Care Facilities, 2002 ed. https://law.resource.org/pub/us/cfr/ibr/004/nfpa.9 9.2005.pdf, (Std: Hlth Care Fcilty - Amer) {242 NFC}