IEC 62642-8:2011

IEC 62642-8 ®
Edition 1.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems – Intrusion and hold-up systems –
Part 8: Security fog device/systems

Systèmes d'alarme – Systèmes d'alarme contre l’intrusion et les hold-up –
Partie 8: Systèmes/dispositifs générateurs de fumée

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IEC 62642-8 ®
Edition 1.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems – Intrusion and hold-up systems –
Part 8: Security fog device/systems

Systèmes d'alarme – Systèmes d'alarme contre l’intrusion et les hold-up –
Partie 8: Systèmes/dispositifs générateurs de fumée

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 13.320 ISBN 978-2-88912-357-5

– 2 – 62642-8  IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Environmental . 8
4.1 Environmental classification . 8
4.2 Environmental tests . 8
5 Access levels . 9
6 Regulation requirements . 9
6.1 General . 9
6.2 Electrical safety . 9
6.3 Safety data sheets . 9
6.4 EMC requirements . 9
6.5 Warning signs . 9
6.6 Pressure vessels . 9
7 Device/system parameters . 10
7.1 Performance . 10
7.2 Battery backup requirement . 10
7.3 IP/IK rating . 10
7.4 Wire free interconnections . 10
8 General requirements . 10
8.1 Tamper. 10
8.2 Fog neutralisation . 10
8.3 Discharge nozzle . 10
8.3.1 Nozzle protection . 10
8.3.2 Nozzle blocked . 11
8.4 Fog eject limiter. 11
8.5 Heating unit . 11
8.6 Overheating . 11
8.7 Accidental triggering . 11
8.8 Isolation of the security fog system. 11
8.9 Fixings . 11
9 Operational requirements . 11
9.1 Communication . 11
9.1.1 Minimum information to be communicated . 11
9.1.2 Non-critical faults. 12
9.1.3 Optional signals . 12
9.2 Fault monitoring . 12
9.3 Power failure . 12
9.4 Efficacy . 12
9.5 Non-toxicity . 12
9.6 Residue . 12

62642-8  IEC:2011 – 3 –
10 Consumables . 12
10.1 Replenishment . 12
10.2 Formulation . 12
10.3 Traceability . 13
11 Marking . 13
12 Documentation . 13
13 Design, installation, operation and maintenance (informative) . 13
Annex A (normative) Performance tests . 14
Annex B (normative) Security fog system warning sign . 20
Annex C (informative) Guidance on design, installation, operation and maintenance of
the security fog system . 21
Bibliography . 23

Figure A.1 – Test chamber . 18
Figure A.2 – Target . 19
Figure A.3 – Partial target . 19
Figure B.1 – Security fog system warning sign . 20

Table A.1 – Fog output versus time elapsed, since first activation . 16
Table A.2 – Correspondence between visibility, density and obscuration . 16
Table B.1 – How to calculate the size of sign you need . 20

– 4 – 62642-8  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ALARM SYSTEMS –
INTRUSION AND HOLD-UP SYSTEMS –

Part 8: Security fog device/systems

FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This International Standard IEC 62642-8 has been prepared by IEC technical committee 79:
Alarm and electronic security systems.
This standard is based on EN 50131-8 (2009).
The text of this standard is based on the following documents:
FDIS Report on voting
79/327/FDIS 79/336/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62642-8  IEC:2011 – 5 –
A list of all parts of the IEC 62642 series can be found, under the general title Alarm systems
– Intrusion and hold-up systems, on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – 62642-8  IEC:2011
INTRODUCTION
This part 8 of the IEC 62642 series of standards gives requirements for security fog
device/systems used in intrusion and hold-up alarm systems. The other parts of this series of
standards are as follows:
Part 1 System requirements
Part 2-2 Intrusion detectors – Passive infrared detectors
Part 2-3 Intrusion detectors – Microwave detectors
Part 2-4 Intrusion detectors – Combined passive infrared / microwave detectors
Part 2-5 Intrusion detectors – Combined passive infrared / ultrasonic detectors
Part 2-6 Intrusion detectors – Opening contacts (magnetic)
Part 2-71 Intrusion detectors – Glass break detectors – Acoustic
Part 2-72 Intrusion detectors – Glass break detectors – Passive
Part 2-73 Intrusion detectors – Glass break detectors – Active
Part 3 Control and indicating equipment
Part 4 Warning devices
Part 5-3 Interconnections – Requirements for equipment using radio frequency techniques
Part 6 Power supplies
Part 7 Application guidelines
Part 8 Security fog devices/systems
This International Standard applies to a security fog system that is part of an Intruder and
Hold-up Alarm System (I&HAS) and is used both as a security deterrent device for building
security and as a crime reduction device for the protection of people.
This International Standard is intended to assist insurers, intruder alarm companies,
customers and the police in understanding the principles and specification of a security fog
system.
The purpose of a security fog system is to reduce the visibility in a protected area by the use
of a non-toxic fog in order to form a barrier between the criminal and the criminal’s intended
target.
This International Standard is not intended to cover standalone or mobile security fog
systems.
This International Standard has been designed to be flexible enough to encourage and
encompass future developments in the field of security fog systems.

62642-8  IEC:2011 – 7 –
ALARM SYSTEMS –
INTRUSION AND HOLD-UP SYSTEMS –

Part 8: Security fog device/systems

1 Scope
This part of the IEC 62642 series specifies the requirements for security fog systems as a part
of an I&HAS. It covers application and performance and also gives the necessary tests and
trials to ensure efficiency and reliability of such obscuration devices.
This International Standard also gives guidance on the criteria for design, installation,
operation and maintenance of security fog systems.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60065:2001, Audio, video and similar electronic apparatus – Safety requirements
IEC 61000-6-3:2006, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 62599-1:2010, Alarm systems – Part 1: Environmental test methods
IEC 62599-2:2010, Alarm systems – Part 2: Electromagnetic compatibility – Immunity
requirements for components of fire and security alarm systems
IEC 62642-1:2010, Alarm systems – Intrusion and hold-up systems – Part 1: System
requirements
IEC 62642-5-3, Alarm systems – Intrusion and hold-up systems – Part 5-3 : Interconnections
– Requirements for equipment using radio frequency techniques
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62642-1, as well as
the following apply.
3.1.1
confirmed intrusion
signals or messages emanating from two or more independent intrusion detectors indicating
there is a high probability that a genuine intrusion or genuine attempted intrusion has
occurred within a specified timeframe
3.1.2
obscuration
the reduction in visibility as a result of the activation of a security fog system

– 8 – 62642-8  IEC:2011
3.1.3
protected area
the designated space the security fog system is designed to restrict the visibility in when
operated
3.1.4
security fog system
device (or a series of separate independent components that make up a device) or system
within tamper resistance housing(s), that, when activated, produces a dense artificial fog,
from a consumable, to reduce visibility in the protected area
3.1.5
verification
the process whereby the security fog system will only operate once the Intruder Alarm System
(IAS) has operated and a detection device in the area of the security fog system has triggered
or an Hold-up Alarm System (HAS) has been operated
3.1.6
wet fog
aggregation of water droplets that may result from incomplete atomisation of the fogging
agent causing a direct spray or spatter from the fog ejection nozzle. This may also result from
poor atomisation of the fogging agent causing individual fog particle size to be too large
NOTE The large particles may fall down and settle on level surfaces as a greasy residue.
3.2 Abbreviations
For the purposes of this document, the abbreviations given in IEC 62642-1 and the following
apply.
EMC Electromagnetic compatibility
IK Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts
IP Ingress protection classification
LEA Law Enforcement Authority (police or governmental body that responds to
activations from security systems)
4 Environmental
4.1 Environmental classification
The security fog system shall meet, as a minimum, Environmental Class II (Indoor – General:
environmental influences normally experienced indoors when the temperature is not well
maintained) in accordance with IEC 62642-1.
EXAMPLE In corridors, halls or staircases and where condensation can occur on windows and in unheated
storage areas or warehouses where heating is intermittent.
NOTE Temperatures may be expected to vary between –10 °C and +40 °C with the average relative humidity of
approximately 75 % non-condensing.
4.2 Environmental tests
For all operations, the security fog system shall not activate, generate tamper, fault or other
signals or messages when subject to the specific range of environmental and EMC conditions
and shall continue to function normally.

62642-8  IEC:2011 – 9 –
The following Class II level environmental tests from IEC 62599-1 shall be applicable when
testing the security fog system:
a) Clause 8: dry heat (operational);
b) Clause 10: cold test (operational);
c) Clause 14: damp heat, cyclic (operational);
d) Clause 17: sulphur dioxide (SO ) (endurance);
e) Clause 20: impact (operational);
f) Clause 22: vibration sinusoidal (operational);
g) Clause 23: vibration sinusoidal (endurance);
and for electromagnetic compatibility, immunity (operational), see IEC 62599-2.
5 Access levels
The access levels used in this standard shall be as stated in 8.3.1 of IEC 62642-1, except for
access level 2. Access level 2 “user” shall not be able to access the security fog system.
6 Regulation requirements
6.1 General
The security fog system shall operate to the following minimum relevant International
regulations.
6.2 Electrical safety
The electrical (safety) construction of the security fog system shall comply with IEC 60065.
6.3 Safety data sheets
The transport, storage and handling of consumables, shall comply with the requirements
stated on the safety data sheets.
6.4 EMC requirements
The security fog system shall meet the EMC conditions and the severity levels defined in
IEC 61000-6-3 and IEC 62599-2.
6.5 Warning signs
As a minimum security fog device/system warning signs shall be positioned on the normal
entry point(s) to the building (International safety signs, Directive 92/58/EEC [1] ). See Annex
B.
6.6 Pressure vessels
Any security fog system that contains pressure vessels shall be transportation and its usage
shall meet the current industry safety requirements (see Directive 97/23/EC, Article 3 [2]).
___________
Figures in square brackets refer to the Bibliography.

– 10 – 62642-8  IEC:2011
7 Device/system parameters
7.1 Performance
The security fog system shall meet the following minimum performance:
– Reduction of visibility to 1 m within 60 s in a minimum volume of 150 m and maintaining
obscuration for a period of 10 min in an un-vented room (performance tests shown in
Annex A).
The performance of the security fog system shall be detailed as shown in Annex A.
7.2 Battery backup requirement
The battery backup requirements of a security fog system cannot achieve compliance of
IEC 62642-1 due to the amount of energy used to power the security fog system.
As a general requirement, a security fog system shall be capable of a single full system
operation for a period within one hour after mains fail.
A single full system operation shall be defined by the manufacturer in the security fog system
specification.
7.3 IP/IK rating
All component parts shall be housed in an enclosure meeting the following requirements:
a) IP rating of IP20;
b) IK rating of IK08.
7.4 Wire free interconnections
If wire free interconnections are used then the requirements shall meet IEC 62642-5-3.
8 General requirements
8.1 Tamper
All material parts and components of the security fog system shall be inside (a) secure,
tamper-resistant outer case(s). The opening by normal means of access to the outer case(s)
shall create an (a tamper message or signal) alarm condition.
The security fog system shall not eject fog on an individual tamper signal or message if the
I&HAS is in the unset condition.
8.2 Fog neutralisation
A security fog system shall not be damaged or neutralised by the phenomenon (fog) it is
supposed to produce.
8.3 Discharge nozzle
8.3.1 Nozzle protection
The discharge nozzle shall be protected to avoid any risk of injury with the security fog
system in standby mode.
62642-8  IEC:2011 – 11 –
8.3.2 Nozzle blocked
If the discharge nozzle becomes blocked, then it shall not cause a hazard.
8.4 Fog eject limiter
The security fog system shall incorporate a method for limiting the quantity of ejected fog in
order to reduce the possibility of damaging residue.
8.5 Heating unit
The temperature of the heating unit shall be fully monitored and controlled to ensure that it
remains within manufacturer's parameters.
8.6 Overheating
The heater unit shall be fitted with a thermal cut off device to prevent overheating outside the
manufacturers' parameters. When the thermal cut off operates it shall require a reset by an
authorised technician.
8.7 Accidental triggering
The security fog system shall not be able to be triggered by an unset I&HAS, but the security
fog system can be triggered by a set HAS if so configured.
8.8 Isolation of the security fog system
There shall be a means of isolating the security fog system from the CIE to avoid a
maintenance technician triggering the security fog system during routine maintenance.
8.9 Fixings
Fixings/mountings shall be appropriate to prevent unauthorised removal or tamper.
9 Operational requirements
9.1 Communication
The security fog system shall be capable of communicating with the host I&HAS.
9.1.1 Minimum information to be communicated
a) INPUTS into the security fog system:
1) set/unset,
2) trigger,
3) verification.
b) OUTPUTS from the security fog system:
1) security fog system active,
2) tamper,
3) low battery charge (if applicable),
4) mains fail,
5) no consumables,
6) incorrect temperature.
NOTE For outputs b) 3) to b) 6), a single signal or message may represent these conditions.

– 12 – 62642-8  IEC:2011
9.1.2 Non-critical faults
There are non-critical faults such as low consumables, etc. These may be transmitted as a
separate signal or message.
9.1.3 Optional signals
Additional inputs/outputs may be provided (e.g. fire alarm inhibit).
9.2 Fault monitoring
The security fog system shall be monitored so that a fault (see 9.1) will generate a signal or
message, which shall be transmitted back to the host I&HAS.
9.3 Power failure
A power failure shall not lead to the triggering of the security fog system.
If a power failure occurs, the security fog system shall send a signal or message to the I&HAS
within 2 min, and where an ATS exists for remote notification at the I&HAS, immediately
notification to the ARC shall occur.
9.4 Efficacy
The security fog system shall produce fog that provides obscuration within the protected area
according to the manufacturer's specification.
9.5 Non-toxicity
The manufacturer shall provide proof that the consumables and the emitted fog do not present
a toxic hazard to persons in normal use and manufacturers specified fluid life-time bearing in
mind the use of the security fog system. This assessment shall be carried out by a accredited
laboratory in the relevant field and shall include the following minimum elements:
a) identification for the product tested;
b) bibliographical research;
c) a chromatographic test assessing all the components, including gaseous components;
d) the laboratory’s conclusions.
9.6 Residue
The security fog system used in accordance with the manufacturer’s instructions shall not
result in damaging residue in the area of use.
10 Consumables
10.1 Replenishment
The consumables used in security fog systems shall be replaced/replenished by the
manufacturer/installer in accordance with manufacturer's instructions.
10.2 Formulation
All formulations for all fluids and propellants shall be recorded and maintained by original
equipment manufacturer.
62642-8  IEC:2011 – 13 –
10.3 Traceability
All consumables shall be identifiable and traceable back to the security fog system
manufacturer.
11 Marking
The security fog system shall be marked in accordance with IEC 62642-1 and statutory
requirements.
12 Documentation
The following minimum documentation shall be available:
a) user instructions;
b) installation instructions;
c) maintenance instructions;
d) a safety data sheet on all consumables;
e) security fog system warning signs.
13 Design, installation, operation and maintenance (informative)
Guidance information for installers and maintainers on the design, installation, operation and
maintenance is shown in Annex C.

– 14 – 62642-8  IEC:2011
Annex A
(normative)
Performance tests
This annex states the test procedure for evaluating fog output and fog performance.
NOTE Since it is accepted that there is a direct relationship between the concentration of airborne fog chemical
and visibility through the resulting fog, this has been selected as the most appropriate basis of quantifying fog
output/performance of the EUT (Equipment Under Test).
The following tests should be carried out in a fog test chamber as detailed below.
A.1 Fog test chamber
The fog test chamber shall be set up as detailed in Figure A.1.
The fog test chamber shall be, apart from as otherwise detailed in this document, an empty
and windowless room or enclosure of volume (150 – 200) m , with a height to ceiling of
(2,5 – 3) m. The volume of the test chamber shall be recorded as (v). The ratio of length to
width shall be between 1:1 and 2:1.
The chamber shall be well lit (300 lx – 500 lx measured at 76 cm above the floor of the
chamber).
Four distribution fans (as shown in Figure A.1) shall be mounted as the same level in the
machine equal distance between the security fog system and the corner of the room as
indicated with the flow rate to give a homogenous distribution in the room. The fans shall be
rated with a flow rate of between (0,15 – 0,3) m /s and the maximum fan tip speed shall not
exceed 3 m/s.
NOTE The distribution fans are only used to calculate the amount of fog chemical used.
The staggered black cross markers (as per Figure A.2) shall be positioned at the
observers/operators eye level, at 2 m and 3 m from the viewing position of the observer.
The staggered grey/black marker (as per Figure A.3) shall be positioned at the
observers/operators eye level, at 1 m from the viewing position of the observer.
The chamber shall be at (20 – 22) ºC, with a relative humidity of (40 – 75) %.
The EUT shall be placed centrally within the chamber, so that the output nozzle is 1 m above
floor level. If the EUT has multiple output nozzles, the centre of the group of nozzles shall be
at 1 m above floor level.
The EUT shall be mounted on a calibrated digital weighing scale, measuring in single gram
increments.
All necessary supply leads to the EUT shall be supported in such a way as to nullify their
impact on the calculation of the amount of fog chemical used.
A.2 Test procedure
The determination of fog chemical concentration to achieve 1 m visibility (1 OD/m, 90 %
obscuration) is essentially a measure of the efficiency of the fog.

62642-8  IEC:2011 – 15 –
The purpose of the first part of the test is to determine the amount of fog chemical required by
the EUT to achieve a uniform 1 m visibility through the fog in the test chamber.
For each activation of the EUT the weight of chemical used per activation shall be recorded.
For the sake of accuracy, and if the manufacturer of the EUT agrees, the flow rate through the
EUT may be reduced so that the visibility target is achieved more progressively, since the
purpose of this exercise is to determine the consumption of fog chemical (mg/m ) to achieve
1 m visibility, not to equate fog output. Alternatively, the manufacturer of the EUT may elect to
produce smoke in short bursts to achieve the same result.
The distribution fans shall be switched on within the chamber to ensure even fog distribution
is achieved once the EUT is activated. The observer/operator within the chamber shall
activate the EUT.
The observer/operator within the test room shall stop the EUT when the black element of the
1 m marker is not visible, and the weight of fog chemical used to achieve that visibility noted.
The test chamber shall then be cleared of fog and this procedure shall be repeated 2 times,
and the mean average weight (zi) of fog chemical used calculated.
A.3 Activation test
The purpose of this part of the test is to enable specific performance figures to be attributed
to individual EUT’s.
The test chamber shall be clear of all visible fog. Distribution fans shall not be used in this
test.
From start time (t0) the observer/operator shall activate the EUT until the weight of fog
chemical used is as in A.2. Record this time as (t1).
The observer/operator shall then assume his viewing position.
Two minutes after (t1), the observer/operator shall confirm that the greyscale element of the
1 m marker is not visible. It is accepted that the black element of the 1 m marker may just be
visible.
If the greyscale element of the 1 m marker is visible at this stage repeat procedure A.2,
reducing the distance to the first marker by 0,1 m. Re-calculate the mean average weight
accordingly (zi), and repeat test A.3 onwards (having re-sited the first marker back to 1 m).
Continue to do this until the greyscale element of the 1 m marker is completely obscured (i.e.
nd rd
(zii) equals the 2 mean average weight, (ziii) equals the 3 mean average weight).
The observer/operator shall continue to view the marker line and shall note the time, in
seconds, that the 2 m and 3 m marks become visible. Record these times as (t2) and (t3).
Repeat this test 2 times to achieve mean average times for (t1)/(t2)/(t3). These averaged
times shall be referred to a (T1)/(T2)/(T3).
A.4 Fog output of EUT
The data from A.2 and A.3 are then used to calculate the fog output at 1 m fog visibility in
m /s.
Fog concentration (c) to achieve 1 m visibility (mg/m ) c = z × 1 000/v

– 16 – 62642-8  IEC:2011
NOTE If it is necessary to re-calculate “z” as per A.3, then the re-calculated “zi”, or “zii”, etc. are used.
Fog chemical usage rate (r) (mg/s) r = z × 1 000/T1
/s) at 1 m visibility r/c
Fog output of EUT (m
A.5 Fog persistency
The following results show the rate of decay of obscuration.
Record the following:
Time for fog density to decay to 2 m (T2) – (T1) (s)
Time for fog density to decay to 3 m (T3) – (T1) (s)
A.6 Fog output over test periods
To account for the different methodologies of fog production, and to take into account rest
periods that may apply to some systems, each manufacturer shall calculate the total
cumulative fog output (in m /s) that would be produced for the following periods after that first
activation of the system.
Table A.1 – Fog output versus time elapsed, since first activation
Total fog output (m³/s) Time following activation
at 1 m visibility
Manufacturer Testhouse
claim result
15 s
30 s
1 min
3 min
5 min
A.7 Fog visibility/density table
For reference, visibility through the fog can be equated to optical density and obscuration as
in Table A.2 below.
Table A.2 – Correspondence between visibility, density and obscuration
Visibility Optical density % Obscuration
m 1/m % ob/m
1 1 90
2 0,5 68,37
3 0,333 53,58
62642-8  IEC:2011 – 17 –
A.8 Performance data
Based on the test procedure detailed in this annex the following performance data relating to
the EUT shall be stated in the testhouse test report:
Based on a test room (150 – 200) m Test results
Fog output of EUT (m /s) at 1 m visibility =
Time (s) for fog density to decay to 2 m =
Time (s) for fog density to decay to 3 m =
Total fog output (m /s) at 1 m visibility after 15 s =
Total fog output (m /s) at 1 m visibility after 30 s =
Total fog output (m /s) at 1 m visibility after 1 min =
Total fog output (m /s) at 1 m visibility after 3 min =
Total fog output (m /s) at 1 m visibility after 5 min =
Fog concentrate usage to achieve 1 m visibility (mg/m ) =

– 18 – 62642-8  IEC:2011
B
1 000
A
1 000
Distribution
1 000
fan
IEC  241/11
Dimensions in millimetres
Test chamber height: (2,50 – 3,0) m

Test chamber volume: (150 – 200) m
Lighting within chamber: (300 – 500) lx at 76 cm above floor
Relative humidity: (40 – 75) %
Test chamber temperature: (20 – 22) °C
Key
A = Equipment Under Test (EUT)
B = Visibility marker line
Figure A.1 – Test chamber
62642-8  IEC:2011 – 19 –
100 % black
IEC  242/11
Dimensions in millimetres
Figure A.2 – Target
100 % black
30 % black
IEC  243/11
Dimensions in millimetres
Figure A.3 – Partial target
– 20 – 62642-8  IEC:2011
Annex B
(normative)
Security fog system warning sign
Figure B.1 shows a security fog system warning sign.

WARNING
SECURITY FOG DEVICE INSTALLED
IEC  244/11
Figure B.1 – Security fog system warning sign
In order to be able to calculate/test the size of sign needed, the stakeholders shall use
Table B.1.
Table B.1 – How to calculate the size of sign you need
Height of signs and maximum viewing distances
Maximum viewing Minimum symbol Recommended letter height of
distances height supplementary text signs
m mm mm
7 60 5
9 80 7
14 120 10
21 180 15
28 240 20
62642-8  IEC:2011 – 21 –
Annex C
(informative)
Guidance on design, installation, operation
and maintenance of the security fog system

C.1 Risk assessment
The use and location of the security fog system will be determined by the risk of intrusion
assessment carried out and specific manufacturer instructions.
If a security fog system is to be fitted to an I&HAS that is already installed then a full risk
assessment should be carried out to ensure the I&HAS and security fog system are integrated
to give the best detection and coverage.
As part of the risk assessment consideration should be given to the time taken to obscure the
protected areas to meet the owners/insurers requirements.
Consideration should be given to providing visual and/or audible indications in the premises
on activation by the security fog system.
C.2 General notification
The installer and/or owner should inform the LEA, the local fire authority and ARC of the
installation prior to the security fog system being commissioned. A record of notification to
these organisations should be kept by the installer and/or owner.
C.3 Confirmation triggering
Consideration should be given for the triggering of the security fog system by a confirmed
intrusion.
C.4 Multi-occupancy
In multi-occupancy buildings or very large sites with internally protected areas the security fog
system should be installed so as to contain the fog within the protected area(s) as far as
practicable so as not to infringe on to public areas or open areas except for security fog
systems which are activated by the use of a hold-up system.
NOTE For this type of building or site it is recommended that, on alarm activation, an audible warning of the
presence of a security fog system be given.
C.5 Man trap – building unoccupied
The security fog system should not be configured to form a “man trap”, i.e. it should not be
the intention to deliberately trap persons or prevent escape.
C.6 Hold-up – building occupied
When a security fog system is used in a hold-up situation the following should be considered:

– 22 – 62642-8  IEC:2011
a) the local fire authority and the LEA should be informed that a hold-up system has a
security fog system installed;
b) there should be a full risk assessment carried out on the location and use of a security fog
system in the hold-up situation;
c) the security fog system should be placed so that the fog generated moves from the target
area to the exit a
...