Secondary Supply 1 : (Hcf-PipSys) Where provided, that portion of the source equipment that automatically supplies the system when the primary supply becomes exhausted
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}