2. Each power source shall be supervised from the other source for loss of power. 3. All circuits shall be monitored for integrity. 4. Visually and audibly annunciate any trouble condition including, but not limited to main power failure, grounds and system wiring derangement. 5. Transmit digital alarm information to the main fire alarm control unit. B. Enclosure: 1. The control unit be housed in a cabinet suitable for both recessed and surface mounting. Cabinet and front shall be corrosion protected, given a rustresistant prime coat, and manufacturer's standard finish. 2. Cabinet shall contain all necessary relays, terminals, lamps, and legend plates to provide control for the system. C. Power Supply: 1. The control unit shall derive its normal power from a 120 volt, 60 Hz dedicated supply connected to the emergency power system. Standby power shall be provided by a 24 volt DC battery as hereinafter specified. The normal power shall be transformed, rectified, coordinated, and interfaced with the standby battery and charger. 2. The door holder power shall be arranged so that momentary or sustained loss of main operating power shall not cause the release of any door. 3. Power supply for smoke detectors shall be taken from the fire alarm control unit. 4. Provide protectors to protect the fire alarm equipment from damage due to lightning or voltage and current transients. 5. Provide new separate and direct ground lines to the outside to protect the equipment from unwanted grounds. D. Circuit Supervision: Each alarm initiating device circuit, signaling line circuit, and notification appliance circuit, shall be supervised against the occurrence of a break or ground fault condition in the field wiring. These conditions shall cause a trouble signal to sound in the control unit until manually silenced by an off switch. E. Trouble signals: 1. Arrange the trouble signals for automatic reset (nonlatching).
2. Each power source shall be supervised from the other source for loss of power. 3. All circuits shall be monitored for integrity. 4. Visually and audibly annunciate any trouble condition including, but not limited to main power failure, grounds and system wiring derangement. 5. Transmit digital alarm information to the main fire alarm control unit. B. Enclosure: 1. The control unit be housed in a cabinet suitable for both recessed and surface mounting. Cabinet and front shall be corrosion protected, given a rustresistant prime coat, and manufacturer's standard finish. 2. Cabinet shall contain all necessary relays, terminals, lamps, and legend plates to provide control for the system. C. Power Supply: 1. The control unit shall derive its normal power from a 120 volt, 60 Hz dedicated supply connected to the emergency power system. Standby power shall be provided by a 24 volt DC battery as hereinafter specified. The normal power shall be transformed, rectified, coordinated, and interfaced with the standby battery and charger. 2. The door holder power shall be arranged so that momentary or sustained loss of main operating power shall not cause the release of any door. 3. Power supply for smoke detectors shall be taken from the fire alarm control unit. 4. Provide protectors to protect the fire alarm equipment from damage due to lightning or voltage and current transients. 5. Provide new separate and direct ground lines to the outside to protect the equipment from unwanted grounds. D. Circuit Supervision: Each alarm initiating device circuit, signaling line circuit, and notification appliance circuit, shall be supervised against the occurrence of a break or ground fault condition in the field wiring. These conditions shall cause a trouble signal to sound in the control unit until manually silenced by an off switch. E. Trouble signals: 1. Arrange the trouble signals for automatic reset (nonlatching).
VA%20NCA%2028%2046%2000.docx