Section 161.002-8 - Automatic fire detecting systems, general requirements(a)General. A fire detection system must consist of a power supply; a control unit on which visible and audible fire and trouble signaling indicators are located; fire and/or smoke detectors; and fire and/or smoke detector circuits, as required, originating from the control unit. Power failure alarm devices may be separately housed from the control unit and may be combined with other power failure alarm systems when specifically approved.21 FR 9032, Nov. 21, 1956, as amended by CGD 94-108, 61 FR 28292, June 4, 1996; USCG-2012-0196, 81 FR 48276 , July 22, 2016