1975 010 Ordinance - Laserfiche WebLink

Home Browse Search

. + ' -4- b. Smoke detectors shall be capable of detecting gray smoke having a minimum smoke obscuration of 4% per foot (optical density of 0.0177 per foot). c. On smoke detectors requiring a light source for operation, failure of the light source shall result in an audible trouble signal. The failure of the light source shall not cause an alarm signal. The audible trouble signal shall be produced at least once every minute for seven consecutive days. d. For each smoke detector requiring a light source, at least one spare light source bulb shall be provided with the detector and mounted conveniently in or on the unit or associated control unit. Section 10. Alarm Sounding Devices. a. Each detection device shall cause the operation of an alarm which shall be clearly audible in all bedrooms over background noise levels with all intervening doors closed. The tests of audibility level shall be conducted with all household equipmant, which may be in operation at night, in full operation. Examples of such equipment are window air conditioners and room humidifiers. b. All alarm sounding devices shall have a minimum rating of 85 dBA at 10 feet. Section Il. Control Equipment. a. The control equipment shall be automatically restoring on restoration of electrical power. b. If a reset switch is provided, it shall be a self-restoring type. c. Any alarm silencing switch or an audible trouble silencing switch shall not be provided unless its silenced position is indicated by a readily apparent signal. d. Each detector shall have a means to permit the householder to check the system. Section 12. Type of Circuit. a. This ordinance requires a detector circuit where a break in the wiring will not cause an alaxm signal, but will cause an audible trouble signal, using either a closed loop detector circuit or normally open contact detectors with end of line resistor or equivalent. b. All installation wiring extended from the output side of a power limited supply shall either use conductors and cables approved for use with power limited fire pxotective signaling circuits or be wired in accordance with the requirements for non- power limited fire protective signaling circuits of Article 760 of the National Electrical Code, NFPA No. 70-1975. c. Wire used shall be o£ the solid conductor, non-stranded type. Section 13. Level of Prdtectidn. A basic smoke detector shall be installed to protect each separate sleeping area and at the head of each stairway leading to an occupied area. Section 14. Detect6r Location and Spacing. a. Smoke detectors in rooms with ceiling slopes greater than one-foot rise per 8-feet horizontally shall be located at the high side of the room. I