Operating Supply : (Hcf-PipSys) The portion of the supply system that normally supplies the piping systems. The operating supply consists of a primary supply or a primary and secondary supply
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}