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HOl'SEHOI.D FIRE WARSI~G EQl"IP\lE~T 72-29 Exaption: Where thi'rt is an inll'n1ming door bttwtt71 oni' In.'tl and tM adjacent lowtr In.'tl, a smokt dttector shall be illstalled on tM lou'er InJel. 2-2.1.1.3 Aulomatic sprinkler systems provided in accor- dance with NFPA 130, StandardfortM Installation of Sprinkler S.Tstems in One- and Two-Family Dwellings and Manufactured HOml!s, or NFPA 13R, Standard for tM hutallation of Sprinklt'l" Sysll'ms in Residential Occupancies up to and Including Four Sto- nes in Height, shall be interconnected to sound alarm notifi- cation appliances throughout the dwelling where a fire warning system is provided. 12.2.2. Alarm Notification Appliances. Each automatic alarm-initiating device shall cause the operation of an alarm that shall be dearly audible in all bedrooms over background noise levels with all inten'ening doors dosed. The tests of audi- bility level shall be conducted with all household equipment that might be in operation at night in full operation. Examples of such equipment are window air conditioners and room humidifiers. (See A-2-2.2 for additional infonnation.) 2.2.2.1 In new construction, where more than one smoke detector is required by 2-2.1, detectors shall be arranged so that operation of any smoke detector causes the alarm in all smoke detectors within the dwelling to sound. Exception: Configurations that provide equitJalent distribution of the alann signal. 12.2.2.2. Standard Signal. Newly installed alarm notifica- tion appliances used with a household fire warning system and I single and multiple station smoke alarms shall produce the audible emergency evacuation signal described in ANSI S3.41, I Audible Emergency ElracuaJion Signal. Signals from different noti- fication appliances shall not be required to be synchronized. 2.2.3 Alarm Notification Appliances for the Hearing Impaired. In a household occupied by one or more hearing impaired persons, each initiating device shall cause the opera- tion of a visible alarm signal(s) in accordance with 2-4.4.2. Since hearing deficits are often not apparent, the responsibility for advising the appropriate persons shall be that of the hearing impaired party. The responsibility for compliance shall be that of the occupants of the family living unit. Exception: A listed tactile signal shaU be pennitted to be employed. 2.3 Power Supplies. 2.3.1 General. 2.3.1.1 All power supplies shall have sufficient capacity to operate the alarm signal(s) for at least 4 continuous minutes. 2-3.1.2 There shall be a primary (main) and a secondary (standby) power source. For electrically powered household fire warning equipment, the primary (main) power source shall be ac; the secondary (standby) power source shall be a battery. Exception No.1: Where tM primo.ry (mo.in) power source is an emergency circuit or a legally required standby circuit capable of operating the system for at least 24 hours in the nonnal condition, followed by not less than 4 minutes of alarm, a secondary (standby) source shall not be required. Exuptioll .vo. 2: Whl'rt tht' P';mllry' (maill) power so/au is a cir- cuit of a/I optiollal standby systrm capahle of opaatillg tl" ~'5tem for at least 24 hours, followed by not less thall 4 millutt's of alann, that I1IUts tht' requirements for eitlll'r all t'lIIc'rgt'tlcy systnn or a ltgall.~ rl'quirtd .Ita lid"" systnn as defirlt'd ill .\'FPA iO, Natiollal Eltctncal Code. A rtidts 700 and 701, rtsp,'cti1.'fl)', a .woruial)' (stalldby) sup- ply shall not be uquirl'd. Exaptiorl No.3: Dl'tectors alld alanlLS powtred from a I1IOnitortd dc circuit of a control unit wlll'Te power for the control unit ml!l'ts the requimnl'Tlts of Section 2-3 and the circuit mnains opl'Table upon loss of primary (main) ac power. Exception No.4: A detector alld a u'iuless trarLSmitll'r tMt ser.'es only that dt"tector shall be pennitti'd to lw power<battery prirnary (mo.in) source where part of a listed, monitored lou' powl'r radio (wireless) system. If Sl'colldarJ' (standby) souru shall II0t bl'uquired. Exaption No.5: In existing cOllstnlCtion, either 071 ac primaT)' power soura, as described in 2-3.2, or a monitorl'd battel)' prilnaT)' (main) pou'er source, as described in 2-3.3, shall be pennittt'd. A st'CondaT)' (standby) 50ura shallllot be rt'quirl'd. Exuptioll No.6: Visible notificatioll appliallces required b.\' 2-4.4.2. Exceptioll No.7: Where the primary' (maill) power 50uru is 11011- l'lectrical, a sl'condary (standby) soura shallllot be rt'quirl'd. The requiremellts of 2-3.5 shall appl.\'. 2-3.2 Primary Power Supply - AC. 2.3.2.1 An ac primary (main) power source shall be a dependable commercial light and po'wer supply source. A visible "power on" indicator shall be provided. 2.3.2.2 All electrical systems designed to be installed by other than a qualified electrician shall be powered from a source not in excess of 30 volts that meets the requirements for power limited fire alarm circuits as defined in NFPA 70. National Ell'ctrical Codl', Article i60. 2-3.2.3 A restraining means shall be used at the plug-in of any cord connected installation. 2-3.2.4 AC primary (main) power shall be supplied either from a dedicated branch circuit or the unswitched portion of a branch circuit also used for power and lighting. Operation of a switch (other than a circuit breaker) or a ground-fault circuit-interrupter shall not cause loss of primary (main) power. _ I Excl'jJtion No.1: Single or multiple station alarms with a super- wed rechargeable standby batury that prmndes alleast 4 months of optral.ion with a fully charged bat.tery. Exception No.2: Where a ground-fault circuit-irlterrupter StTlltS all electrical circuits within the hOllSehald. 2-3.2.5 Neither loss nor restoration of primary (main) power shall cause an alarm signal. I Excl'jJtion: An alann signal shall be pennitted within the hOllSl'- hold but shall not exceed 2 seconds. 2-3.2.6 Where a secondary (standby) battery is pro\'ided, the primary (main) power supply shall be of sufficient capac- ity to operate the system under all conditions ofloading with any secondary (standby) battery disconnected or fully dis- charged. 1996 Edition