(a) General. A manual fire alarm system shall consist of a power supply, a control unit on which are located visible and audible fire and trouble alarms, and fire alarm circuits as required originating from the control unit and terminating at manual fire alarm boxes. 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.
(b) Types. Manual fire alarm systems shall be one of the following types, or a combination of several types:
(1) Manual fire alarm stations superimposed on and connected as an integral part of the fire detector circuit wiring of an automatic fire detection system.
(2) Electrical system using manually operated fire alarm boxes.
(3) Other types as may be developed.
(c) Power supply. The power supply shall be as specified for automatic fire detecting system by Sec. 161.002-9.
(d) Manual fire alarm system control unit. The manual fire alarm system control unit shall be as specified for automatic fire detecting systems by Sec. 161.002-10. [21 FR 9032, Nov. 21, 1956, as amended by CGD 94-108, 61 FR 28292, June 4, 1996]