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AS 2220.1-1989 EMERGENCY WARNIING AND INTERCOMMUNICATION SYSTEMS IN BUILDINGS - EQUIPMENT DESIGN AND MANUFACTURE

AS 2220.1-1989 EMERGENCY WARNIING AND INTERCOMMUNICATION SYSTEMS IN BUILDINGS - EQUIPMENT DESIGN AND MANUFACTURE

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This Australian Standard was prepared by Committee BD/56, Emergency Warning and
Intercommunication Systems in Buildings. It was approved on behalf of the Council
of Standards Australia on 4 May 1989 and published on 11 September 1989.

The following interests are represented on Committee BD/56:
Association of Consulting Engineers, Australia
Australian Assembly of Fire Authorities
Australian Fire Protection Association
Australian Uniform Building Regulations Coordinating Council
Building Owners and Managers Association of Australia

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Commonwealth Fire Board
Department of Administrative Services—Construction Group
Department of Defence
Electrical Contractors Associations of Australia
Fire Protection Industry Association of Australia
Insurance Council of Australia
Public Works Department, New South Wales
Public Works Department, Victoria
Safety Institute of Australia
Telecom Australia

Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject
to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is
important therefore that Standards users ensure that they are in possession of the latest ed ition, and any
amendments thereto.
Full details of all Australian Standards and related publications will be found in the Standards Australia
Catalogue of Publications; this information is supplemented each month by the magazine ‘The Australian
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and amendments, and of withdrawn Standards.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 office of Standards Australia,
are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should 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 85304.

AS 2220.1—1989

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Australian Standard 
Emergency warning and
intercommunication systems in
buildings
Part 1: Equipment design and
manufacture

First published as part of AS 2220—1978.
AS 2220—1978 (in part) revised and redesignated
AS 2220.1—1989.
Incorporating:
Amdt 1—1989.
Amdt 2—1993.

PUBLISHED BY STANDARDS AUSTRALIA
(STANDARDS ASSOCIATION OF AUSTRALIA)
1 THE CRESCENT, HOMEBUSH, NSW 2140
ISBN 0 7262 5785 0

AS 2220.1—1989

2

PREFACE
This Standard was prepared by the Standards Australia Committee BD/56, Emergency
Warning and Intercommunication Systems in Buildings. It is Part 1 of a two-part
Standard, the parts of which are as follows:
AS
2220

Emergency warning and intercommunication systems in buildings
Part 1: Equipment design and manufacture (this Standard)
Part 2: System design, installation and commissioning

This Standard together with AS 2220.2 superseded AS 2220—1978, Emergency
warning and intercommunication systems for buildings.
This Standard provides more detailed requirements than AS 2220—1978 but it does
not differ in the overall intent of that Standard.
AS 1851, Maintenance of fire protection equipment, Part 10: Emergency warning and
intercommunication systems, specifies the periodic inspection and maintenance
requirements to ensure continued effective functioning of the emergency warning and
intercommunication systems designed and installed in accordance with AS 2220.

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This Standard does not seek to define the buildings in which these systems are to be
used as it is considered that this is the responsibility of the Building Authority in the
area concerned.

 Copyright STANDARDS AUSTRALIA
Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where the
Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may be
reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from
Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on
commercial software royalties should be directed to the head office of Standards Australia.
Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use
exclusively 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 royalty
payment 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 the
Standard is amended or revised. The number and date of the Standard should therefore be clearly identified.
The use of material in print form or in computer software programs to be used commercially, with or without payment, or in
commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.

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AS 2220.1—1989

CONTENTS
Page
FOREWORD . . . . . . . . . . . . . . . . . . .
SECTION 1. SCOPE AND GENERAL
1.1 SCOPE . . . . . . . . . . . . . . . . .
1.2 APPLICATION . . . . . . . . . . .
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS . . . . . . . . . . .

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SECTION 2. EMERGENCY WARNING SYSTEM
2.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . .
2.2 SYSTEM FUNCTIONS . . . . . . . . . . . . . .
2.3 SYSTEM COMPONENTS . . . . . . . . . . . .
2.4 EMERGENCY CONTROL PANELS (ECPs)
2.5 MAIN EQUIPMENT . . . . . . . . . . . . . . . .
2.6 ACTUATION DEVICES . . . . . . . . . . . . .

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SECTION 3. EMERGENCY INTERCOMMUNICATION SYSTEM
3.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 SYSTEM FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 ADDITIONAL EQUIPMENT AT THE ECPs . . . . . . . . . . . .
3.4 EQUIPMENT FOR WARDEN INTERCOMMUNICATION
POINT (WIP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 FUNCTIONAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . .
3.7 POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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SECTION 4. EQUIPMENT DESIGN AND CONSTRUCTION
4.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 MARKING AND IDENTIFICATION OF EQUIPMENT

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SECTION 5. PERFORMANCE TESTING
5.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 FUNCTIONAL ASSESSMENT . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 ENDURANCE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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SECTION 6. DOCUMENTATION
6.1 GENERAL . . . . . . . . . . .
6.2 OPERATOR’S MANUAL .
6.3 TECHNICAL MANUAL .
6.4 LOGBOOK . . . . . . . . . . .

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APPENDICES
A TYPICAL BLOCK SCHEMATIC OF BASIC EWIS . . . . . . . . . . .
B INFORMAT ION T O BE SUPPL IE D WHEN SPE CIFYING AN
EMER GE NC Y WARNING AND INTE RC OMMUNICATION
SYST EM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C TYPICAL EMERGENCY CONTROL PANELS . . . . . . . . . . . . . .
D PREPARATION FOR TESTING . . . . . . . . . . . . . . . . . . . . . . . . .
E OPERATIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F TRANSIENT VOLTAGE TEST PROCEDURES . . . . . . . . . . . . . .
G ELECTROMAGNETIC COMPATIBILITY TEST PROCEDURES . .

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31

AS 2220.1—1989

4

FOREWORD

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An emergency warning and intercommunication system is installed in a building for
the purpose of enabling the orderly evacuation of the building in the event of an
emergency. To achieve this aim, it is essential that the emergency warning and
intercommunication system has the following capabilities as appropriate:
(a) Provision for manual and automatic activation.
(b) On activation, the ability to alert wardens with an audible alarm. (A visual alarm
may also be required.)
(c) Where both an emergency warning system and an emergency intercommunication
system are required to comply with AS 2220, these systems are integrated to
provide a positive means of intercommunication between the House Warden and
the various floors or Zone Wardens to enable the orderly evacuation of the
building.
(d) Emission of audible or visible signals, or both, that will either (i) alert the occupants; or
(ii) order the occupants to vacate the building.
(e) Ease of operation.
(f) Continuously operable under the conditions of the hazard.

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5

AS 2220.1—1989

STANDARDS AUSTRALIA
Australian Standard
Emergency warning and intercommunication systems in buildings
Part 1: Equipment design and manufacture
SECTION 1.

SCOPE AND GENERAL

1.1 SCOPE.
This Standard sets out minimum
requirements for the design and manufacture of the
equipment used in emergency warning and
intercommunication systems, which are installed in
buildings to ensure warning in the event of an
emergency, and assist in the subsequent orderly
evacuation of the building.
1.2 APPLICATION. Equipment for emergency
warning and intercommunication systems in buildings
shall comply with Sections 2, 3 and 4 of this Standard.

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NOTE: Information which should be supplied when specifying an
EWIS is shown in Appendix B.

1.3 REFERENCE DOCUMENTS. The following
documents are referred to in this Standard:
AS STANDARDS
1044
Limits of electromagnetic interference for
electrical appliances and equipment
1076
Code of practice for selection, installation
and maintenance of electrical apparatus and
associated equipment for use in explosive
atmospheres (other than mining applications)
1076.1
Part 1: Basic requirements
1099
Basic environmental testing procedures for
electrotechnology
1102
Graphical symbols for electrotechnical
documentation
1102.101 Part 101: General information and general
index
1102.105 Part 105: Semiconductor and electron tubes
1560
Recommendations for the design and use of
components intended for mounting on printed
circuit boards
1603
Automatic fire detection and alarm systems
1603.4
Part 4: Control and indicating equipment
1931
High voltage testing techniques
1931.1
Part 1: General definitions, test requirements
test procedures and measuring
devices
1939
Classification of degrees of protection
provided by enclosures of electrical
equipment
2036
Manually operating fire-alarm call points
2220
Emergency warning and intercommunication
systems in buildings
2220.2
Part 2: System design, installation and
commissioning
2481
All-or-nothing electrical relays (instantaneous
and timing relays)
2546
Printed boards
2546.1
Part 1: General requirements and test
methods
2546.3
Part 3: Design and use

2547
2547.2.1
2547.2.2
3000
AUSTEL
REG 2

REG 3

IEC
249
249-2
801
801-3
UL
94

Semiconductor devices
Part 2.1: Integrated circuits—General
Part 2.2: Integrated circuits—Digital
SAA Wiring Rules
Int erworking and non-interference
requirements for customer premises
equipment attached to the public switched
telephone network
General requirements for customer switching
systems attached to the public switched
telephone network
Base materials for printed circuits
Part 2: Specifications
Electromagnetic compatibility for industrial
process measurement and control equipment
Part 3: Radiated electromagnetic field
requirements
Tests for flammability of plastic materials for
parts in devices and appliances

APPROVAL AND TEST SPECIFICATIONS
AS
3100

3108
3108.1
3108.2
3108.3

Approval and test specification for definitions
and general requirements for electrical
materials and equipment
Isolating transformers and safety isolating
transformers
Part 1: General requirements
Part 2: Supplementary requirements—
Isolating transformers
Part 3: Supplementary requirements—
Safety isolating transformers

3126

Extra-low voltage transformers

3159

Electronic sound and vision equipment

3250

Mains operated electronic and related
equipment for household and similar general
use

1.4 DEFINITIONS. For the purpose of this Standard,
the definitions below apply.
1.4.1 Alarm system—facility provided in a building to
give an alarm in the event of fire, civil commotion,
bomb threat, leakage of toxic or noxious fumes,
structural damage, or other emergency.
1.4.2 Alarm signal—a signal given by fire alarm, or
other alarm system, at the fire indicator panel (FIP) or
other point at the building, and to places outside the
building, e.g. to a fire brigade.

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AS 2220.1—1989

6

1.4.3 Alert signal—an audible signal, or combination of
audible and visible signals, from the emergency warning
system to alert wardens and other nominated personnel
as necessary to commence prescribed actions.
1.4.4 Approved and approval—approved by, or the
approval of, the Regulatory Authority concerned.
1.4.5 Emergency-alarm-initiating device—a manually
operated device by which an alarm is given to indicate
an emergency.
1.4.6 Emergency control panel (ECP)—a panel by
means of which the emergency warning system and the
emergency intercommunication system (if any) in the
building may be operated.

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NOTE: See also definition of master emergency control panel
(MECP).

1.4.7 Emergency warning and intercommunication
system (EWIS) In this Standard the acronym EWIS is
used to refer to a system which may be either an
emergency warning system or a combined emergency
warning and intercommunication system.
1.4.8 Emergency warning system (EWS)—a system to
provide a distinctive audible signal, verbal address, and
visible signals as required, for emergency alarm
purposes.
1.4.9
Emergency intercommunication system
(EIS)—a two-way system which provides voice
communication between the controlling emergency
control panel (ECP) and the warden intercommunication
points (WIPS).
1.4.10
Evacuation signal—an audible signal, or
combination of audible and visible signals, from the
emergency warning system to indicate to wardens and
building occupants generally that evacuation or other
prescribed actions are necessary.
1.4.11 Evacuation zone—a specific portion of a
building or complex, in which the evacuation procedures
are managed by one zone warden.
NOTE: This term should not be confused with the concept of ‘fire
alarm zone’ as defined in AS 1603.4. Fire alarm zone may or may
not cover the same area as an evacuation zone.

1.4.12 Fire indicator panel (FIP)—a panel on which
is mounted an indicator or indicators together with
associated equipment for the fire alarm or sprinkler
system.

1.4.13 House warden—a person who, during an
emergency, assumes control over the building and
its occupants and is the prime contact with the
appropriate emergency service(s).
1.4.14
Master emergency control panel
(MECP)—a specially designated emergency
control panel (ECP) that on manual operation of its
key switch, takes full control of the emergency
war n in g s y st em a n d th e em erg en cy
intercommunication system, and overrides all other
ECPs in the building.
1.4.15
Regulatory Authority—an authority
administering Acts of Parliament or Regulations
under such Acts.
NOTE: Where adoption of this Standard is not a requirement
of a Regulatory Authority but is a requirement of a body such
as a relevant company or association, then that body, or their
nominee such as the Insurance Council of Australia, may
perform the functions of the Regulatory Authority for the
purposes of this Standard.
If the EWIS is one provided by virtue of Statutory
Regulations, the relevant department will have authority. If
it is a matter of insurance, the relevant insurance company or
association may have authority.

1.4.16 Repeater panel (RP)—an indicator panel
which visually repeats alarm signals from all alarm
zone facilities.
1.4.17 Verbal address—the mode of operation
whereby verbal instruction is given from the
controlling emergency control panel (ECP) to the
building occupants via the loud speaker systems.
1.4.18
Warden intercommunication point
(WIP)—the location on a floor or evacuation zone,
where equipment is provided through which
instructions can be received from the controlling
emergency control panel (ECP) via the emergency
intercommunication system.
1.4.19 Zone (floor) warden—a person who,
during an emergency, assumes control over a
particular floor or evacuation zone under the
direction of the house warden.

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7

AS 2220.1—1989

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SECTION 2. EMERGENCY WARNING SYSTEM
2.1 GENERAL. The emergency warning system
(EWS) shall provide a totally independent emergency
warning system to alert occupants of a building to a
potential emergency situation and to initiate orderly
evacuation of the building, if required.
2.2 SYSTEM FUNCTIONS. The emergency warning
system shall perform the following functions:
(a) Generate alert and evacuation signals in individual
evacuation zones within a building.
(b) Facilitate verbal address to individual evacuation
zones and throughout the building.
(c) Indicate system status and faults.
(d) Operate from a dedicated battery power supply in
the event of power failure.
Where both an emergency warning system and an
emergency intercommunication system are provided,
these system shall be integrated. The operation of EIS
shall not be inhibited when the EWS is in use.
The system may be used for non-emergency functions,
such as paging and background music, during times of
normal occupancy. All non-emergency functions shall be
disabled during an emergency or power failure.
2.3
SYSTEM COMPONENTS.
The following
components form parts of a system (see Appendix A for
a typical block schematic):
(a) Emergency control panels (ECPs) including verbal
address microphone.
(b) Main equipment which includes amplifier and
evacuation tone generators, automatic level
controller, sound system power amplifiers, fault
monitoring equipment, and power supply (batteries
and charger).
(c) Devices including loud speaker, visible alarm
devices, and emergency alarm initiating devices.
(d) Wiring (as specified in AS 2220.2).
NOTE: This Standard recognizes and is appropriate to the following
system configurations:
(a)
A system operating from a single cabinet containing all
control, signalling and amplification equipment.
(b)
As for (a) but with a single or multiple remote ECPs.
(c)
As for (a) and (b) but with distributed amplification
equipment located in evacuation zones.

2.4 EMERGENCY CONTROL PANELS (ECPs).
2.4.1 General. The emergency warning system may
incorporate one or more ECPs to provide a control and
indication interface with the system. The ECP may be
co-located with the main equipment or at one or a
number of strategically located control positions.
2.4.2
Indicators and controls.
The following
indicators and controls shall be provided at each ECP:
(a) A key-operated AUTOMATIC/MANUAL/
ISOLATE switch as follows:
(i)

Automatic position. In the AUTOMATIC
position, the actuation of the alarm system
shall activate the relevant warning system in
the alert mode. The key shall be removable
only in the AUTOMATIC position. A green
light shall indicate the AUTOMATIC position.

NOTE: The system should remain in the AUTOMATIC position
at all times unless the house warden is attending to the
emergency.

(ii)

(iii)

Manual position. In the MANUAL position,
the automatic initiation of the emergency
warning system shall be inhibited.
The purpose of the MANUAL position shall
be to permit normal control of the warning
system irrespective of the state of the alarm
system and also to negate the actuation of the
warning system during routine testing or
maintenance of the warning system or alarm
systems.
Any ECP shall be able to take control of the
emergency warning system by turning the key
switch to the MANUAL position and, once in
control, it shall inhibit control of the system
from other ECPs. Only the master emergency
control panel (MECP) key switch being placed
in its MANUAL position shall override any
ECP in its MANUAL position.
Isolate position. In the ISOLATE position,
the ECP shall be disabled from distributing
audible and visible signals throughout the
building by key panel operation. All other
functions shall remain operative.
NOTE: In this mode, the ECP may be used for training
purposes without disturbing the building occupants.

(iv) Keys. All EWIS keys shall be keyed alike
with the fire indicator panel (FIP).
(b) Control switches, to cause individual or
simultaneous actuation of warning signal and public
address announcement at selected floors or
evacuation zones. These controls can also be used
for test periods, trial evacuation practices, etc.
NOTE: Different evacuation zones should be able to receive
different signals simultaneously or individually, e.g.
Evacuation zones 9 and 10
alert
Evacuation zone 8
public address
Evacuation zone 7
evacuate
Evacuation zone 6
public address
Evacuation zones 1 to 5
alert.

(c) A microphone, to permit transmission of
instructions to selected floors over the warning
system. This microphone may normally be that
incorporated in the handset used for
intercommunication (see Section 3) connected
through a press-to-talk switch on the ECP.
Alternatively the microphone may be a hand-held,
noise-cancelling device complete with press-to-talk
switch, with coiled flexible cord permanently
connected to the control panel, and shall have a
retaining clip.
NOTE: High energy radio frequency fields may be present due
to close proximity of the police or fire brigade using radio
transceivers during an emergency. (See Clause 4.2.6.)

(d) An audible indicator, capable of drawing immediate
attention to either of the following:
(i) An external alarm condition.
(ii) A system fault.

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AS 2220.1—1989

8

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The sound level of the audible indicator shall be at
least 80 dB(A) measured at a distance of 1 m from
the ECP with the cabinet door (if any) closed.
The audible indicator shall be provided with an
acknowledgment switch which mutes the audible
indicator and changes the associated display from
flashing to steady. Subsequent alarm conditions or
system faults shall reactivate the indicator.
2.4.3 Discrete-switch type panel. ECPs which use
individual switches to control the operation of the
EWIS on each evacuation zone shall comply with the
following:
(a) Switches shall provide visual and tactile or
audible feedback to the operator.
(b) Visible indicators, in accordance with
Clause 2.4.5.5 shall be mounted in or adjacent to
the switches and shall operate within 500 ms of
switch actuation.
(c) Selection of any function shall automatically
cancel any previous function for the same
evacuation zone.
(d) Two types of manual operation as follows:
(i)

All zone mode. Operation of the warning
system on all evacuation zones of the
building in a common mode. In this mode
of operation, the selected signal, e.g., Alert,
Evacuation, Public Address shall be
transmitted to all zones simultaneously. The
‘All Alert’, ‘All Evacuate’ and ‘All Public
Address’ switches shall be latched.
Individual functions shall be overridden
whenever an ‘All’ function is in operation.
The ‘Cancel’ switch shall
reset the
selected function.

(ii) Individual zone mode. Operation of the
warning system on selected evacuation
zones of the building. In this mode of
operation, selected signals, e.g. Alert,
Evacuation, Public Address, shall be
transmitted to different evacuation zones.
The ‘Alert’, ‘Evacuation’ and ‘Public
Address’ functions shall be latched. The
‘Cancel’ switch shall reset the evacuation
zone.
2.4.4 Key-pad type panel. ECPs which use a
key-pad and associated microprocessor to control the
operation of the EWS shall comply with the
following:
(a) The key-pad shall be arranged to provide visual
and tactile or audible feedback.
(b) Visible indicators including alphanumeric
displays shall comply with Clause 2.4.5.5.
Alphanumeric displays shall incorporate
sufficient characters to permit a complete
message to be displayed without scrolling. Seven
segment displays shall not be used.
Where liquid crystal displays are used they shall
i ncorporat e backl i ght i ng. Incandescent
backlighting is not acceptable.
(c) The sequence of a key-pad entry shall be the
evacuation zone followed by the function (e.g.

45-evacuate). On completion of a key-pad entry, the
system shall display the command on the
alphanumeric display within 500 ms and request that
the ‘OK’ key be pressed to activate the function. The
clearing of a ‘non-keyed’ entry shall be achieved by
pressing the ‘CANCEL’ key.
(d) Any incorrect command shall bring up on the
display an ‘error’ message, in plain English,
without abbreviations.
(e) Operation shall be in an ‘ALL ZONE MODE’,
and ‘INDIVIDUAL ZONE MODE’ basis, as
follows:
(i)

All zone mode. Selection of the ‘ALL’ area
key shall cause the selected signal to be
distributed to all evacuation zones of the
building.
(ii) Individual zone mode. Selection of an
individual evacuation zone shall distribute
the selected signal to the required
evacuation zone.
NOTE: Pre-selected groups of zones may be
pre-programmed to allow activation by a single key.

(f) Cancellation of an existing function shall be
achieved by rekeying the relevant zone(s)
followed by the required function, and pressing
the ‘OK’ key when prompted.
(g) A repeater panel shall be incorporated into the
key-pad type panel to indicate the functions that
are active for each evacuation zone.
2.4.5 Arrangement of indicators and controls.
2.4.5.1 General. The indicators and controls at the
ECP shall be arranged ergonomically.
The indicators shall be arranged in a pattern that will
give an easily interpreted layout of the evacuation
zones in a building for which it is intended. They
shall be arranged per evacuation zone and they shall
provide the operator with information on the progress
of the operation.
2.4.5.2
Discrete-switch type panel.
Where a
discrete-switch type panel is specified, this shall
have, for each zone, individual function switches
together with their respective indications, arranged in
a pattern that will give an easily interpreted layout of
the evacuation zones in a building for which it is
intended. (See Figure C1, Appendix C, for a typical
example.) They shall be arranged per evacuation zone
and they shall provide the operator with information
on the progress of the operation.
2.4.5.3 Key-pad type panel. Where a key-pad type
panel is specified, this shall incorporate a dedicated
key for each of the functions, namely alert,
evacuation, public address and cancellation, plus a
separate numerical keyboard which shall allow for
floor or evacuation zone selection. The keyboard shall
provide formation of groups by using a ‘to’ key, e.g.
‘7-to-10-Evacuate’ would initiate evacuation in zones
7,8,9 and 10. (See Figure C1, Appendix C, for a
typical example.)
2.4.5.4 Functions and colours. The functions and
the associated colours shall be in accordance with
Table 2.1.

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2.4.5.5 Visible indicators. Visible indicators shall be
readily distinguishable when viewed from a distance
of 1 m and at all angles of up to 30 degrees from the
indicator’s axis when the panel in which the indicator
is located, is illuminated at a level of 600 lx. The
flashing frequency shall be between 1 Hz and 2 Hz
with approximately equal on-off periods.
Incandescent lamps are not acceptable.

2.5.2.4 Automatic overriding of ancillary functions.
Where the emergency warning system is intended to be
used as a paging-background music system under
non-emergency conditions, priority shall be given to the
emergency warning functions when manually or
automatically activated. Where local volume controls
are incorporated, these shall be by-passed when the
emergency warning system is activated. The by-pass
shall be wired in a fail-safe mode.

TABLE 2.1
CONTROL AND INDICATOR COLOURS

2.5.2.5 Circuit integrity. The system shall be designed
so that failure of any component within any evacuation
zone, including conductors, amplifiers, and fault
detection systems, does not affect the normal operation
of other evacuation zones.
2.5.2.6 Actuation of warning signals. Any alarm
condition initiated via alarm initiating signal lines from—
(a) alarm systems;
(b) emergency alarm initiating devices; and
(c) any selected warning signal function keyed in at a
controlling ECP;
shall cause the distribution of warning signals to the
appropriate evacuation zones within 5 s.

Function
Actuate alert tone
Actuate evacuation tone
Actuate public address systems
Cancel
A combined fire and local alarm
indication for each evacuation zone
Fault/audible indicator

Licensed to LUU MINH LUAN on 25 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

AS 2220.1—1989

Colour, Indicator
Amber, steady
Red, steady
Amber, steady

Red, flashing, steady
on acknowledgment
Amber, flashing, steady
on acknowledgment

2.4.5.6 Labelling of indicators and controls. All
EWIS indicators and controls shall be indelibly
labelled with their actual function name or a readily
recognizable abbreviation.
2.4.6 ECP circuit protection. The integrity of the
circuit connections between the ECPs located
remotely from the main equipment shall be
continuously monitored. Loss of communications due
to a fault shall be raised as an alarm at the MECP.
2.5 MAIN EQUIPMENT.
2.5.1
General.
The main equipment of the
emergency warning system comprises all necessary
automatic control, signalling, amplification and power
supplies to provide system operation in conjunction
with an ECP and remote actuation devices.
2.5.2 System operation.
2.5.2.1 General. The system shall provide for—
(a) automatic initiation of the EWS by the activation
of any alarm initiating device or alarm system,
connected to the EWS; and
(b) manual operation by key switch at the ECP.
2.5.2.2
Automatic evacuation sequence.
For
buildings with 6 or more evacuation zones, automatic
execution of the evacuation shall be arranged so that
the affected evacuation zones have first priority and
the other evacuation zones are evacuated in a logical
sequence.
NOTE: As an example for a multistorey building, this order of
priority could be as follows:
(a)
Emergency—affected level.
(b)
Two levels above.
(c)
Level below.
(d)
Other levels in priority order.

2.5.2.3 Interconnection of alarm systems. The main
equipment shall be interconnected with the FIP,
where provided. An isolation facility shall be
incorporated to prevent automatic actuation of the
emergency warning system under test conditions. Any
other alarm system connected to the emergency
warning system shall have a similar facility.
Isolation of alarm initiating signalling lines shall raise
a fault indication (see Clause 2.5.7.2).

2.5.2.7 System program. Where a programmed system
is incorporated, it shall be non-volatile, i.e. a failure of
electrical power shall not require re-programming.
2.5.3 Warning signal generation.
2.5.3.1 Audible signals. Alert and evacuation signals
shall be provided in accordance with the following
requirements:
(a) Alert signal. The audible alert signal shall be a
repetitive interrupted square wave of 420 Hz
having equal on-off duration of 0.625 s each.
Upon assignment of an alert signal to an
evacuation zone, the first tone burst shall be 50 dB
below the maximum output specified in
AS 2220.2; each successive tone burst shall have
an amplitude of 10 dB above that of the previous
one until the maximum is reached at the sixth tone
burst. All subsequent tone bursts after the sixth
shall have the maximum output specified in
AS 2220.2.
A graphical representation of the alert signal is
given in Figure 2.1.
(b) Evacuation signal-automatic mode. The evacuation
signal shall be emitted in cycles of 24 s duration.
Each cycle shall consist of four identical bursts
of a frequency-modulated square wave increasing
from 500 Hz to 1200 Hz, followed by two
identical verbal messages, in accordance with
Figure 2.2 except that for special applications the
total length of the verbal message may be
extended up to 20 s per cycle, but the four tone
bursts per cycle shall remain.
(c) Evacuation signal-manual mode. The evacuation
signal shall be a frequency-modulated square
wave uniformly increasing from 500 Hz to
1200 Hz at a repetition rate of 15 cycles per
minute. The signal should have an ON duration
of 3.75 s and an OFF duration of 0.25 s giving a
total of ON-OFF duration of 4.0 s.

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AS 2220.1—1989

10

(d) Stored verbal message. The verbal message shall
be either digitally stored or utilize voice synthesized
techniques. The verbal message derived from either
method should be clear, intelligible and without
accent. The signal shall have a minimal operational
band width of 300 Hz to 4 kHz.
Each message, in a form that is applicable to the
particular building, shall instruct occupants to
evacuate the building as directed.
(e) Tolerances. The frequencies and durations given
for audible signals specified herein may vary within
±5 percent, within the full operating temperature
range, including anticipated long-term ageing
effects. Digitally generated, frequency stepped
increments shall not exceed 4 percent.

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2.5.3.2 Visible signals. Where required, the visible
signal for alert and evacuation shall be flashing lights,
having not less than 60 and not more than 120 flashes
per minute. The colours of these lights shall be amber
for alert and red for evacuation.
2.5.3.3 Duration of alert signal. The alert signal shall
continue on until manual control of the system is taken
and, if not responded to within a prescribed time from

initiation, the automatic evacuation sequence shall
commence. The prescribed time shall be established to
suit the particular building, but it shall not exceed
10 min.
2.5.4 Automatic level controller. The main equipment
shall incorporate an automatic level controller with a
dynamic range of at least 30 dB, to ensure voice
messages from ECPs are distributed to amplifiers at a
level which ensures compliance with sound performance
requirements.
2.5.5 Sound system amplifiers.
2.5.5.1 Design and output. Pre-amplifiers and power
amplifiers shall be of solid state design. The output level
of amplifiers shall be adjustable. Adjustments shall be
preset on the circuit card.
2.5.5.2 Performance. Each amplifier shall have the
performance characteristics shown in Table 2.3.
2.5.5.3 Power rating and regulation. The nominal
average power rating of each amplifier shall be not less
than 3 dB above the average power required to produce
the prescribed sound levels in the respective evacuation
zone.
The line output shall be floating above ground potential.

FIGURE 2.1 GRAPHICAL REPRESENTATION OF THE ALERT SIGNAL

FIGURE 2.2 AUTOMATIC EVACUATION-SIGNAL CYCLE

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