Uninterruptible Power Supply (UPS) 07 : A system designed to provide power, without delay or transients, during any period when the primary power source is incapable of performing
NFPA 1221 Standard for the Installation, Maintenance, and Use of Emergency Services Communications Systems, 2007 ed. (Std: Install, Maint, and Use of Emr Srvc Commun - Amer) {391 NFC}