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<br />-3- <br />requirements for power limited fire protective signaling circuits as defined in <br />Article 760 of the National Electrical Code, NFPA No. 70-1975. <br />c. A cord-connected installation is acceptable provided the installation makes <br />use of a receptacle not subject to loss of power by a wall switch. A restraining <br />means shall be used at the plug-in. <br />d. Neither loss nor restoration of primary power shall cause an alarm signal. <br />Section 7. Primary Power Supply (Monitored Batte ) <br />a. Household Eire warning equipment may be powered by a battexyprovided that <br />the battery is monitored to assure that the following conditions are met: <br />1. All power requirements are met for at least one year's life, <br />including routine testing. <br />2. A distinctive audible trouble signal is given before the battery <br />is incapable of operating (from aging, terminal corrosion, etc.) the device(s) <br />for alarm purposes. <br />3. For a unit employing a lock-in alarm feature, automatic transfer <br />is provided from alarm to a trouble condition. If a unit does not have a <br />lock-in feature, automatic transfer from alarm to trouble is not required. <br />4. The unit is capable of producing an alarm signal £or at least four <br />minutes a t the battery voltage at which a trouble signal is normally obtained <br />followed by seven days of trouble signal operation. <br />5. The audible trouble signal is produced at least once every minute <br />for seven consecutive days. <br />Section 8. Combination System. <br />a. When common wiring is employed for a combination system, the equipment for <br />other than the fire warning signaling system shall be connected to the common wiring <br />of the system so that short circuits, open circuits, grounds, or any fault in this <br />equipment or interconnection between this equipment and the fire warning system wiring <br />shall not interfere with either the supervision of the fire warning system or prevent <br />alarm or trouble signal operation. <br />b. In a Fire/Burglar System, the operation shall be as follows: <br />1. A fire alarm signal shall take precedence or be clearly recognizable <br />over any other signal even when the non£ire alarm signal is initiated first. <br />2. Distinctive alarm signals shall be obtained between fire alarm and <br />other functions, such as burglar alarm. The use of a common sounding appliance <br />for fire and burglar alarm is acceptable if distinctive signals are obtained. <br />A steady, continuous sound £or one alaxm function and a pulsing sound for the <br />other alarm function is acceptable. <br />Section 9. <br />Saoke Detectors. <br />a. Each smoke detector shall be capable of detecting abnormal quantities of <br />smoke that may occur in a dwelling and shall properly operate in the normal enviton- <br />mental conditions of a household. <br />