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  • AS 1670.61997

    Australian Standard

    Fire detection, warning, controland intercom systemsSystemdesign, installation andcommissioning

    Part 6: Smoke alarms

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  • This Australian Standard was prepared by Committee FP/2, Fire Detection,Warning, Control and Intercom Systems. It was approved on behalf of the Councilof Standards Australia on 18 October 1996 and published on 5 January 1997.

    The following interests are represented on Committee FP/2:

    Audio Engineering Society

    Australian Building Codes Board

    Australian Chamber of Commerce and Industry

    Australian Chamber of Manufactures

    Australian Construction Services Department of Administrative Services

    Australian Electrical and Electronic Manufacturers Association

    Australian Fire Authorities Council

    Australian Fire Protection Association

    Building Owners and Managers Association of Australia

    Commonwealth Fire Board

    CSIRO Division of Building, Construction and Engineering

    Deafness Forum of Australia

    Department of Defence

    Fire Protection Industry Association of Australia

    Insurance Council of Australia

    National Electrical Contractors Association of Australia

    New Zealand Fire Equipment Association

    New Zealand Fire Protection Association

    New Zealand Fire Protection Industry Contractors Association

    Telstra Corporation

    Review of Australian Standards. To keep abreast of progress in industry, Australian Standards aresubject to periodic review and are kept up to date by the issue of amendments or new editions asnecessary. It is important therefore that Standards users ensure that they are in possession of the latestediti on, and any amendments thereto.Full details of all Australian Standards and related publications will be found in the Standards AustraliaCatalogue of Publications; this information is supplemented each month by the magazine TheAustralian Standard, which subscribing members receive, and which gives details of new publications,new editions and amendments, and of withdrawn Standards.Suggestions for improvements to Australian Standards, addressed to the head off ice of StandardsAustralia, are welcomed. Notif ication of any inaccuracy or ambiguity found in an Australian Standardshould be made without delay in order that the matter may be investigated and appropriate action taken.

    This Standard was issued in draft form for comment as DR 96002.Acce

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  • AS 1670.61997

    Australian Standard

    Fire detection, warning, control andintercom systemsSystem design,installation and commissioning

    Part 6: Smoke alarms

    PUBLISHED BY STANDARDS AUSTRALIA(STANDARDS ASSOCIATION OF AUSTRALIA)1 THE CRESCENT, HOMEBUSH, NSW 2140

    ISBN 0 7337 0814 5Acc

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  • AS 1670.6 1997 2

    PREFACE

    This Standard was prepared by the Joint Standards Australia/Standards New ZealandCommittee FP/2 on Fire Detection, Warning, Control and Intercom Systems, to facilitatethe installation and commissioning of smoke alarms in domestic residential situations andis the result of a consensus among the representatives on the Joint Committee to produceit as an Australian Standard.The term informative has been used in this Standard to define the application of theappendix to which it applies. An informative appendix is only for information andguidance.

    Copyright STANDARDS AUSTRALIAUsers of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where theCopyright Act allows and except where provided for below no publications or software produced by Standards Australia may bereproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writ ing fromStandards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and informationon commercial software royalt ies should be directed to the head off ice of Standards Australia.

    Standards Australia wil l permit up to 10 percent of the technical content pages of a Standard to be copied for useexclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia.Standards Australia will also permit the inclusion of its copyright material in computer software programs for no royaltypayment provided such programs are used exclusively in-house by the creators of the programs.

    Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever theStandard is amended or revised. The number and date of the Standard should therefore be clearly identif ied.The use of material in print form or in computer software programs to be used commercially, with or without payment, or incommercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.

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  • 3 AS 1670.6 1997

    CONTENTSPage

    SECTION 1 SCOPE AND GENERAL1.1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.2 APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.3 REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.4 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.5 COMPLIANCE WITH OTHER STANDARDS . . . . . . . . . . . . . . . . . . . . . 41.6 INTERPRETATION OF SPECIFIED LIMITING VALUES . . . . . . . . . . . . 4

    SECTION 2 INSTALLATION AND COMMISSIONING2.1 LOCATION OF SMOKE ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.2 ALARM SIGNALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.3 INTERCONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.4 WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.6 COMMISSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

    APPENDICESA FIRE AND DETECTION CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . 8B INSTALLATION GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10C MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

    First published as AS 1670.6 1997.

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  • AS 1670.6 1997 4

    STANDARDS AUSTRALIA

    Australian StandardFire detection, warning, control and intercom systems

    System design, installation and commissioning

    Part 6: Smoke alarms

    S E C T I O N 1 S C O P E A N D G E N E R A L

    1.1 SCOPE This Standard sets out the requirements for the installation andcommissioning of smoke alarms which comply with the requirements of AS 3786.This Standard includes information on the selection, installation and maintenance ofsmoke alarms.

    1.2 APPLICATION This Standard applies to smoke alarms installed in singledwellings.

    1.3 REFERENCED DOCUMENTS The following documents are referred to in thisStandard:AS2706 Numerical values Rounding and interpretation of limiting values3000 Electrical installations Buildings, structures and premises (known as the SAA

    Wiring Rules)3786 Smoke alarmsSAAHB46 Guide to residential fire safety

    1.4 DEFINITIONS For the purpose of this Standard, the definitions given belowapply.1.4.1 Multiple station smoke alarm a smoke alarm with interconnection facilities forcommon alarm communication.1.4.2 Single station smoke alarm a smoke alarm not intended to be interconnectedwith other units for common alarm purposes.1.4.3 Smoke alarm a device containing a smoke detector and an alarm soundingdevice.

    1.5 COMPLIANCE WITH OTHER STANDARDS The smoke alarm installationshall comply with the appropriate electrical safety requirements specified in AS 3000.

    NOTE: To minimize false alarms caused by electrical interference and for ease of maintenance,it is recommended that smoke alarms connected to low voltage are wired to a dedicated circuit.

    1.6 INTERPRETATION OF SPECIFIED LIMITING VALUES For the purpose ofassessing compliance with this Standard, the specified values herein shall be interpreted inaccordance with the rounding method described in AS 2706, i.e. the observed orcalculated value shall be rounded to the same number of figures as in the specifiedlimiting value and then compared with the specified limiting value. For example, forspecified limiting values of 2.5, 2.50 and 2.500, the observed or calculated value wouldbe rounded to the nearest 0.1, 0.01 and 0.001 respectively.

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  • 5 AS 1670.6 1997

    S E C T I O N 2 I N S T A L L A T I O N A N DC O M M I S S I O N I N G

    2.1 LOCATION OF SMOKE ALARMS2.1.1 General Smoke alarms shall be located on or near the ceiling. On levelscontaining bedrooms a smoke alarm shall be located between each area containingbedrooms and the remainder of the dwelling. Where the bedroom area is served by ahallway, the smoke alarm shall be located in that hallway.

    NOTE: For information on fire and detection characteristics, see Appendix A.

    2.1.2 Multi-level Where the dwelling is multi-level, at least one smoke alarm shall belocated on each level such that the egress path from each level is protected. All smokealarms shall be interconnected.2.1.3 Sloping ceilings Smoke alarms in rooms with ceiling slopes greater than 1 in 8shall be located at the high side of the ceiling.2.1.4 Dead air spaces Smoke alarms shall not be located in the following areas:(a) Within 300 mm of a light fitting.(b) In dead air spaces as shown in Figure 2.2.2.1.5 Joists and beams On ceilings with exposed joists or beams with a depth notexceeding 300 mm, smoke alarms may be located on the underside of the joist or beam.2.1.6 Stairwells Smoke alarms installed in stairwells shall be located to ensure thatsmoke rising in the stairwell is not prevented from reaching the smoke alarm by a door orother obstruction.2.1.7 Forced air circulation In areas provided with airconditioning or forced airventilation, smoke alarms shall not be installed closer than 400 mm to any supply airopening. Smoke alarm locations shall be chosen to take account of the airflow towardsreturn air openings. Where ceiling fans are installed smoke alarms shall not be installedwithin 400 mm of the blades of the fan.2.1.8 Environmental conditions Smoke alarms shall not be located in areas where theenvironmental conditions exceed the manufacturers operating parameters.

    2.2 ALARM SIGNALS2.2.1 Aural alarm signals Smoke alarms shall be installed to ensure that the auralsignal is clearly audible in all bedrooms of the dwelling over the background noisenormally encountered, with all intervening doors closed. For audible signals intended toarouse sleeping occupants, the sound pressure level of the signals shall be not less than75 dBA when measured at the sleeping position.

    NOTES:1 A sound pressure level of not less than 75 dBA and 15 dB above expected ambient noise

    levels (air conditioners and the like) at the bed should be sufficient to awaken an averagesleeping person (see Paragraph B5 of Appendix B).

    2 Appendix B provides a step-by-step guide to the selection of smoke alarms, and to thelocation in which they will achieve adequate performance.

    2.2.2 Visual alarm signals Visual alarm signals shall be installed where it is requiredto alert persons who are hearing impaired or in areas of high ambient noise levels.2.2.3 Other sensory alarm signals Where the alarm signals specified in Clauses 2.2.1and 2.2.2 are not adequate, other types of sensory stimulating alarm devices may be used.

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  • AS 1670.6 1997 6

    2.3 INTERCONNECTION Smoke alarms shall only be interconnected to compatibledevices in accordance to the manufacturers requirements.Typical field wiring with interconnections are shown in Figure 2.1.

    FIGURE 2.1 TYPICAL FIELD WIRING

    2.4 WIRING Field wiring for smoke alarms on dedicated circuits shall generally becarried out in 16/0.20 stranded wire for externally d.c. powered units and 1.0 mm2 cablefor 240 V a.c. powered units. Where connected to existing circuits the cable size shall bethe same as the circuit to which the connection is made.

    2.5 MOUNTING Smoke alarms shall be mounted in accordance with themanufacturers instructions, with the aperture for smoke entry not less than 25 mm belowthe ceiling surface when mounted on the ceiling.

    2.6 COMMISSIONING Smoke alarms shall be commissioned in accordance with themanufacturers instructions.The correct operation and adequacy of the sound intensity of each smoke alarm shall bechecked.Where the smoke alarm system performs additional functions such as the alarm operationof interconnected devices and the operation of escape lights, the additional functions shallnot adversely affect the operation of the system.

    NOTES:1 To enhance fire safety in the home refer to Handbook SAA HB46.2 Appendix C provides information on the maintenance of smoke alarms.

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  • 7 AS 1670.6 1997

    DIMENSIONS IN MILLIMETRES

    FIGURE 2.2 DEAD AIR SPACES

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  • AS 1670.6 1997 8

    APPENDIX A

    FIRE AND DETECTION CHARACTERISTICS(Informative)

    A1 GENERAL Fire is a leading cause of accidental death. Residential occupanciesaccount for most fire fatalities and most of these deaths occur at night during the sleepinghours. Statistics indicate that a family will experience one serious fire every generation.Due to the variety of combustibles and conditions in the family home the nature of fireswill vary widely. Following ignition, a fire may break out in flames almost immediatelyor smoulder for several hours before breaking out in flames. Some types of detectors aremore appropriate than others for specific types of fires and consideration should be givento smoke alarm selection.

    A2 FIRE GROWTH During the smouldering stage, a fire will release a small amountof heat, possibly toxic gases, and airborne matter in a variety of particle sizes. Particulatematter and toxic fume inhalation is the most common cause of death in house fires.Following the onset of flaming, the fire will grow in size and spread rapidly, fuelled bythe surrounding combustible material and the heat produced by the fire. The rate of firespread in any specific case will depend on the flammability of interior contents, includingfurnishings, the surface materials of ceilings, walls and floors, and the oxygen supply.During the flaming stage, with adequate air supply various gases and particulate matterreleased will be approximately proportional to the fire size. Where the air supply isrestricted, as may be the case in a closed living unit, oxygen depletion will occur andcarbon monoxide production will increase as the fire grows.

    A3 FIRE BY-PRODUCTS The most threatening by-product of a fire and one ofspecial consideration where fire deaths are concerned is carbon monoxide. All materials,when burned, release carbon monoxide some synthetic materials at much higher rates.Test fires of simulated living rooms show that furniture upholstered with polyurethanefoam is capable of producing lethal concentrations of carbon monoxide within one or twominutes of ignition. Carbon monoxide interferes with the ability of blood to carry oxygento the brain, causing confusion, disorientation and unconsciousness. A person exposed tohigh levels of carbon monoxide would be unconscious after a few breaths and deathwould follow in one to three minutes. The carbon monoxide given off from a fire couldbe likened to pumping a car exhaust into the home.At a certain stage of the fire, the cumulative effects of overheated air, toxic gases andoxygen deficiency will overcome any occupants. Since the time available for escape isdependent on the stage at which the fire is detected and on the rate of fire spread,maximum protection is achieved by detection of the fire at its earliest stage.

    A4 ALARM SELECTIONA4.1 General The object of any smoke alarm is to provide early warning of a fire inorder to maximize escape time. Whilst attempting to reach the same objective, differentdetection principles, such as ionization or photoelectric, behave differently. In decidingwhich type to install, consideration needs to be given to the likely type of fire(smouldering or fast flaming) and therefore the type of particulate matter and gases to bedetected. The ambient conditions and the likelihood of the installation creating anunacceptable level of nuisance alarms should also be considered. A mixture of alarm typesmay be required to optimize detection results.

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  • 9 AS 1670.6 1997

    A4.2 Principle of operation Smoke alarms respond to the smouldering state of a fireby detecting the airborne particulate matter from the fire before significant heat build-upoccurs. Results of full-scale fire tests in actual dwellings indicate that smoke alarmsprovided sufficient time for evacuation from the dwelling. For these reasons, theinstallation of smoke alarms in the vicinity of sleeping areas is recommended as theprimary means of providing an alarm signal (see Appendix B).A4.3 Ionization smoke alarms Ionization smoke alarms respond to a sufficiently widerange of fires to be of general use and are particularly responsive to fast flaming fireswhere little visible smoke may occur. They are generally less troubled by dust or insectcontamination, are generally more prone to nuisance alarms due to fumes from cookingand portable gas or oil heaters, which may lead to the alarm being disconnected by theuser, and are slower to respond to smoke produced by slow smouldering fires than arephotoelectric types.A4.4 Photoelectric smoke alarms Photoelectric smoke alarms sense visible smokeparticles. They respond to a sufficiently wide range of fires to be of general use and areparticularly responsive to smouldering fires and the dense smoke given off by foam-filledfurnishings or overheated PVC wiring. Photoelectric smoke alarms are generally lessprone to nuisance alarms from cooking but may be more prone to nuisance alarms causedby airborne condensate, dust or insect contamination. They contain no radioactivematerial. Mesh screens may reduce insect ingress, but it is impossible to make the alarmsdust proof, as they would then be unable to sample the air. For this reason it is importantthat photoelectric smoke alarms are kept clean.A4.5 Heat alarms and heat detectors As an addition to the installation of smokealarms, heat alarms or detectors provide a method of fire detection in locations wheredetection is considered advisable, yet the installation of a smoke alarm is inappropriate orwould cause an unacceptable level of nuisance alarms. Examples may include enclosedlaundries or kitchens.Heat alarms or detectors are not a substitute for smoke alarms; they are not sensitive tosmoke, but in a closed room with a vigorous fire they may respond faster than a remotelylocated smoke alarm. A heat alarm or detector must be interconnected to any smokealarms so that the alarm can be heard throughout the building. Heat alarms or detectorsrequire the least maintenance of any alarm and are less affected by contamination.

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  • AS 1670.6 1997 10

    APPENDIX B

    INSTALLATION GUIDE(Informative)

    B1 GENERAL The purpose of installing smoke alarms is to provide early warning ofa potentially life threatening condition and provide the maximum possible exit time.Whether due to personal preference or ambient conditions, additional alarms should beconsidered.

    B2 DEAD AIR SPACES The smoke and heat generated by a fire generally rise,spread out and begin to bank down from the ceiling. The corner where the ceiling andwall meet is an air space into which the smoke may have difficulty penetrating. In mostfires this dead space measures approximately 0.3 m across the ceiling and 0.1 m down thewall from the corner. A dead air space will also be found at the apex of a sloping ceiling.Dead air spaces may also be found between joists and beams. Smoke alarms must not beplaced in these dead air spaces. While the preferred location of smoke alarms is on theceiling, in some instances it may be necessary to mount them on a wall to avoid dead airspaces.Where the ceiling temperature is significantly different from the temperature of air spacebelow, such as where the space above the ceiling is open to the outside with little or noinsulation over the ceiling, or where a ceiling mount is not feasible, the smoke alarmshould be located on the wall. Where exterior walls are uninsulated, the smoke alarmshould be located on an interior wall.

    B3 AIRFLOW A smoke alarm will detect a fire when the concentration of airborneparticulate matter at the device reaches the alarm threshold level. Under adverse ambientairflow conditions, these products may not reach a smoke alarm until the fire hasdeveloped sufficient heat to overcome the ambient air movement pattern. Dilution andadverse air movement patterns may be caused by forced air ventilation systems, hot aircirculating heating systems, airconditioning systems, and movement of outside air throughopen doors and windows. In a rapidly spreading fire this may result in insufficient timefor escape.

    B4 ADDITIONAL SMOKE ALARMSB4.1 General In the absence of ambient air movement, detection of a fire by an alarmlocated outside the room of fire origin will be delayed by the restrictions on themovement of the fire products to other areas of the dwelling. The optimum may be theinstallation of a smoke alarm in each room of a dwelling and their interconnection willreduce the delay in raising an alarm.B4.2 Bedrooms If the bedrooms accommodate a smoker or contain heaters, electricblankets or other devices which may be a source of a fire, smoke alarms should beinstalled in such bedrooms to provide earlier warning. The recommended smoke alarm forbedroom applications is the photoelectric type.B4.3 Doors The practice of closing doors within the dwelling is recommended as thesecan act as a heat and smoke barrier effectively dividing the dwelling into fire zones.There are documented case histories where a closed door has saved lives in a fire. If thispractice is adopted, the closed door may delay or prevent products of combustion reachinga smoke alarm. At least one smoke alarm should be located in each fire zone and allsmoke alarms should be interconnected.

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  • 11 AS 1670.6 1997

    TABLE B1KEY CONSIDERATIONS FOR SMOKE ALARMS

    Key considerations for REQUIRED smoke alarms Number of smoke alarms(a) How many levels in the dwelling without bedrooms?(b) How many clustered bedroom areas?

    Key considerations for ADDITIONAL smoke alarms

    Yes(tick)

    No(tick)

    (c) Follow the flowchart in Figure B1 for each bedroom:Bedroom 1

    Bedroom 2

    Bedroom 3

    Bedroom 4

    Bedroom 5

    Bedroom 6

    Place the number of Yes ticks in the right-hand column

    (d) Are there(i) any living areas segregated by closed internal doors from the bedrooms?(ii) occupants with special needs (e.g. hearing impaired, non-ambulant, infirm,

    very young)?(iii) other unusual factors which may degrade the effectiveness of the smoke

    alarm?

    Place the number of Yes ticks in the right-hand column

    (e) Total number of smoke alarms required

    * Occupants with special needs may require additional alerting devices other than the integral sounder fitted to a smoke alarm (e.g. vibrating devices, strobe lights and airmovement devices).

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  • AS 1670.6 1997 12

    FIGURE B1 ADDITIONAL SMOKE ALARMS REQUIRED FOR BEDROOMS

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  • 13 AS 1670.6 1997

    B4.4 Large residences Smoke alarms located remotely from the bedroom areas may notbe loud enough to waken the average person. It is recommended that remote smoke alarmsbe interconnected to those in or adjacent bedrooms. The interconnection of multi-stationsmoke alarms provides a simultaneous alarm throughout the dwelling thereby providingearlier warning. For example, if the smoke alarm in the dining room actuates, then theinterconnected units in the bedroom area will simultaneously sound to wake sleepingoccupants.B4.5 Occupants with special needs Consideration should be given to installing a smokealarm in any room where the occupant, such as an elderly or sick person, or a very youngchild, is unable to respond quickly to a fire. This gives the occupant maximum time toevacuate the dwelling.

    B5 AUDIBLE ALARM LEVEL When assessing the audible alarm level, dependingupon the design of the dwelling, the sound level generated by the smoke alarms located inhallways may provide insufficient audible alarm level in bedroom areas.Typically, the sound attenuation through closed doors is in the order of 10 dB to 20 dB.Therefore, the smoke alarm system may need to be extended to include additional smokealarms in the affected bedroom areas.

    B6 NUMBER OF SMOKE ALARMS Figure B1 and Table B1 provide installers with astep-by-step approach to the selection of the number of smoke alarms required byClause 2.1 and recommended in Paragraph B4.

    B7 SMOKE ALARM LOCATION Table B2 is used to identify locations which maybe unsuitable for the reliable operation of a smoke alarm.Installers should note the location constraints and reconsider the smoke alarm location ortype if a Yes answer is given to any of the questions in Table B2.

    TABLE B2SMOKE ALARM LOCATION

    Location of smoke alarmTick relevant box

    Yes No

    Is the location

    (a) near a stove, furnace, hot water heater or similardevice?

    (b) damp or humid?(c) very hot or very cold?(d) dusty or dirty?(e) near fresh air vents or draughty areas?(f) near an insect infected area?(g) near fluorescent lights?

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  • AS 1670.6 1997 14

    B8 INSTALLATION EXAMPLESB8.1 Three bedroom dwelling Figure B2 shows a design for a typical dwelling. Smokealarms are installed in the living/dining room and hallway associated with bedrooms 2 and3. The two locations are chosen because the bedroom areas are segregated. Warning isprovided in the escape paths associated with both bedroom areas.An additional consideration for this dwelling is the placement of a photoelectric smokealarm in the rumpus room. When the doors leading from the family/kitchen area are closed,the dwelling is divided into three fire zones, each now with a smoke alarm. The choice of aphotoelectric alarm in the rumpus room has been made because it is less sensitive tocooking fumes and more sensitive to the dense smoke given off by the furnishings found inrumpus/family rooms. With no smoke alarm in this location, a fire could develop to asignificant stage before either of the other two smoke alarms operated, particularly if theexit doors were closed. The addition of the rumpus/family smoke alarm greatly enhanceslife safety protection as it provides earlier warning and thereby a greater chance of escape.The three alarms should now be interconnected to enable a general alarm to be giventhroughout the dwelling.

    FIGURE B2 TYPICAL THREE BEDROOM DWELLING

    B8.2 Long dwelling In a dwelling with a long layout (see Figure B3) one smoke alarmmay be located in the hallway adjacent to the bedroom area. However, the hallway doorpotentially divides the dwelling into two fire zones, sleeping area and living area.Should this door be closed, products of combustion originating from the living zone willbe delayed in reaching the smoke alarm in the hallway, thereby preventing early warning.Closing the door at night is a positive action; however, it does make it necessary to place asecond smoke alarm (photoelectric) in the rumpus area.

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  • 15 AS 1670.6 1997

    Both smoke alarms should be interconnected so that any alarm will be simultaneouslyraised in both the sleeping and living areas. If this is not done, the hall door should be leftopen. Escape could be via the laundry.

    FIGURE B3 LONG DWELLING

    B8.3 Multilevel dwelling In multilevel dwellings, a smoke alarm is required to be fittedon each level.Most dwellings of this type have only one escape path from the upper level, via the lowerlevel (see Figure B4).

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  • AS 1670.6 1997 16

    FIGURE B4 MULTILEVEL DWELLING

    A sleeping occupant on the upper level needs to be alerted to an alarm originating fromelsewhere in the dwelling. To effectively alert occupants, all smoke alarms need to beinterconnected.In the example shown in Figure B5, a smoke alarm has been positioned in the primaryescape path for each level.Protection can be enhanced by undertaking the following:(a) The placement of a photoelectric smoke alarm in the family room is desirable. The

    closure of the access door into the lounge at night segregates the family/kitchen areaas a separate fire zone. All smoke alarms need to be interconnected.

    (b) Protection for the garage is considered desirable because it is the storage area forflammable liquids and solvents. As the garage is integral to the dwelling yet has nodirect access, any products of combustion generated within the garage will not bedetected by the smoke alarms installed inside the house.Smoke alarms could be used, however the choice of detection technology dependsupon the purposes for which the garage is used. Smoke alarms may generate anunacceptable level of nuisance alarms due to dust or fumes. A heat alarm is notsensitive to these conditions and has been selected for use. The heat alarm must beinterconnected to the smoke alarms for early warning.

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  • 17 AS 1670.6 1997

    FIGURE B5 MULTILEVEL DWELLING FLOOR PLANS

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  • AS 1670.6 1997 18

    APPENDIX CMAINTENANCE

    (Informative)

    C1 GENERAL Smoke alarms should be regularly maintained in accordance with themanufacturers recommendations and the recommendations of this Appendix.

    C2 TESTING Smoke alarms should be tested at least once per month by the user.

    C3 INSPECTION Smoke alarms should be inspected and cleaned at six-monthlyintervals.

    C4 BATTERIES Where batteries are used as the power source and are designed to bereplaced, they should be replaced in accordance with the manufacturers recommendations.

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    AS 1670.61997 FIRE DETECTION, WARNING, CONTROL AND INTERCOM SYSTEMSSYSTEM DESIGN, INSTALLATION AND COMMISSIONING - SMOKE ...PREFACECONTENTSSECTION 1 SCOPE AND GENERAL1.1 SCOPE1.2 APPLICATION1.3 REFERENCED DOCUMENTS1.4 DEFINITIONS1.4.1 Multiple station smoke alarm1.4.2 Single station smoke alarm1.4.3 Smoke alarm

    1.5 COMPLIANCE WITH OTHER STANDARDS1.6 INTERPRETATION OF SPECIFIED LIMITING VALUES

    SECTION 2 INSTALLATION AND COMMISSIONING2.1 LOCATION OF SMOKE ALARMS2.1.1 General2.1.2 Multi-level2.1.3 Sloping ceilings2.1.4 Dead air spaces2.1.5 Joists and beams2.1.6 Stairwells2.1.7 Forced air circulation2.1.8 Environmental conditions

    2.2 ALARM SIGNALS2.2.1 Aural alarm signals2.2.2 Visual alarm signals2.2.3 Other sensory alarm signals

    2.3 INTERCONNECTION2.4 WIRING2.5 MOUNTING2.6 COMMISSIONING

    APPENDIX A - FIRE AND DETECTION CHARACTERISTICSA1 GENERALA2 FIRE GROWTHA3 FIRE BY-PRODUCTSA4 ALARM SELECTIONA4.1 GeneralA4.2 Principle of operationA4.3 Ionization smoke alarmsA4.4 Photoelectric smoke alarmsA4.5 Heat alarms and heat detectors

    APPENDIX B - INSTALLATION GUIDEB1 GENERALB2 DEAD AIR SPACESB3 AIRFLOWB4 ADDITIONAL SMOKE ALARMSB4.1 GeneralB4.2 BedroomsB4.3 DoorsB4.4 Large residencesB4.5 Occupants with special needs

    B5 AUDIBLE ALARM LEVELB6 NUMBER OF SMOKE ALARMSB7 SMOKE ALARM LOCATIONB8 INSTALLATION EXAMPLESB8.1 Three bedroom dwellingB8.2 Long dwellingB8.3 Multilevel dwelling

    APPENDIX C - MAINTENANCEC1 GENERALC2 TESTINGC3 INSPECTIONC4 BATTERIES

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