IEC 62851-2:2014

IEC 62851-2 ®
Edition 1.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm and electronic security systems – Social alarm systems –
Part 2: Trigger devices
Systèmes d'alarme et de sécurité électroniques – Systèmes d'alarme sociale –
Partie 2: Déclencheurs
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IEC 62851-2 ®
Edition 1.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm and electronic security systems – Social alarm systems –

Part 2: Trigger devices
Systèmes d'alarme et de sécurité électroniques – Systèmes d'alarme sociale –

Partie 2: Déclencheurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 13.320 ISBN 978-2-8322-1501-2

– 2 – IEC 62851-2:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Manually-activated trigger devices . 9
4.1 General requirements . 9
4.2 Functional requirements . 9
4.2.1 General . 9
4.2.2 Trigger device with internal primary batteries . 9
4.2.3 Trigger device with internal power supply connected to the
a.c. mains and sealed rechargeable batteries . 9
4.2.4 Push button fixed or portable type . 10
4.2.5 Push button fixed type . 10
4.2.6 Pull switch fixed type . 10
4.2.7 Push button portable type . 10
5 Test of manually-activated trigger devices . 10
5.1 Test categories . 10
5.2 Standard atmospheric condition for testing. 10
5.3 Number of trigger devices used for testing . 11
5.4 General conditions for tests . 11
5.4.1 Triggers using cable transmission . 11
5.4.2 Triggers using wire-free transmission . 11
5.5 Functional tests . 12
5.5.1 Triggers using cable transmission . 12
5.5.2 Triggers using wire-free transmission . 12
5.5.3 Fixed trigger type . 13
5.5.4 Portable trigger with neckband relief (anti-strangle) device . 13
5.5.5 Push button fixed trigger types . 13
5.5.6 Push button portable trigger types . 14
5.5.7 Pull switch fixed trigger type . 14
5.5.8 Pull activated portable trigger . 15
5.6 Wire-free radio interconnections measurements . 16
5.7 Environmental tests . 16
5.7.1 General . 16
5.7.2 Selection of tests and severities (environmental groups) . 17
5.7.3 Tests applicable to the different environmental groups . 17
5.7.4 Environmental test exposures not applicable to different types
of triggers . 17
5.7.5 Specific environmental test requirements for different types of
trigger devices . 20
6 Automatically-activated trigger devices . 25
6.1 Typical automatically-activated triggers . 25
6.1.1 Fire alarm triggers . 25
6.1.2 Gas alarm triggers . 25
6.1.3 Activity monitoring triggers. 25
6.2 Common requirements . 25

6.2.1 General . 25
6.2.2 Operation of automatically-activated trigger . 25
6.2.3 Response to an automatically-activated trigger . 25
6.3 Specific requirements for fire, gas, intruder alarm triggers . 25
7 Marking . 26
7.1 Information to be included in the marking . 26
7.2 Requirements for the marking . 26
Annex A (normative) Measurements of contact and insulation resistances for
mechanical contact function . 27
A.1 General . 27
A.2 Measurements of contact resistance . 27
A.3 Measurements of insulation resistance. 27
Annex B (normative) Strain relief test jig . 28
Annex C (normative) Test set-up by using rf-shielded test fixtures . 29
C.1 RF-shielded test fixture for the trigger device . 29
C.2 RF-shielded test fixture for the local unit or controller . 29
C.3 Interconnection between trigger device and local unit or controller . 29
Bibliography . 31

Figure B.1 – Strain relief test jig . 28
Figure C.1 – RF-shielded test figure . 30

Table 1 – Measurement of radio transmitter parameters . 16
Table 2 – Environmental tests for fixed trigger devices . 19
Table 3 – Environmental tests for portable trigger devices . 20

– 4 – IEC 62851-2:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ALARM AND ELECTRONIC SECURITY SYSTEMS –
SOCIAL ALARM SYSTEMS –
Part 2: Trigger devices
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62851-2 has been prepared by IEC technical committee 79: Alarm
and electronic security systems.
This first edition is based on EN 50134-2:1999.
The text of this standard is based on the following documents:
FDIS Report on voting
79/457/FDIS 79/468/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.

A list of all parts in the IEC 62851 series, published under the general title Alarm and
electronic security systems – Social alarm systems, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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 – IEC 62851-2:2014 © IEC 2014
INTRODUCTION
This standard is part of the IEC 62851 series of International Standards and Technical
Specifications “Alarm and electronic security systems – Social alarms systems“, written to
include the following parts:
– Part 1: System requirements
– Part 2: Trigger devices
– Part 3: Local unit and controller
– Part 5: Interconnections and communications
– Part 7: Application guidelines (under consideration)
A social alarm system provides 24 hours facilities for alarm triggering, identification, signal
transmission, alarm reception, logging and 2-way speech communication, to provide
reassurance and assistance for people living at home or at places under surveillance and
considered to be at risk.
A social alarm system is comprised of a number of system parts which can be configured in
different ways to provide this functionality.
A user can request assistance by the use of a manually activated trigger device resulting in
an alarm triggering signal. In certain cases, alarm triggering signals can be generated by
automatic trigger devices. A local unit or controller receives the alarm triggering signal,
switching from the normal to the alarm condition and indicating this to the user (some systems
use an optional pre-alarm condition that allows the user to reset the alarm for a short period
of time).
The controller normally transmits the alarm condition to an Alarm Receiving Centre (ARC) via
the alarm transmission system. The ARC can either be local to the controller or remote from
the controller. The ARC has the facility to identify the local unit, alarm type and to then
establish two-way speech communication between the alarm recipient and the user. The
alarm recipient provides reassurance to the user and directs assistance where appropriate.
In some cases, the alarm may be diverted to an alarm recipient using a personal receiver. In
this case, the alarm is identified to the alarm recipient and a two-way speech communication
path established to the user and receipt of the alarm acknowledged to the controller. In all
cases, the system records the time, date, location and type of alarm.
The system is designed to detect and report fault conditions affecting the transmission of
alarms. In some cases, temporary disconnection of a local unit is possible to minimize faults
or prevent alarms triggered inadvertently affecting the correct operation of the system.

ALARM AND ELECTRONIC SECURITY SYSTEMS –
SOCIAL ALARM SYSTEMS –
Part 2: Trigger devices
1 Scope
This part of IEC 62851 specifies the requirements and tests for manually-activated trigger
devices forming part of a social alarm system.
This International Standard only applies to manually-activated trigger devices that transmit
the alarm triggering signal to a local unit or controller via cable or wire-free radio
transmission, i.e.
a) push button fixed;
b) pull switch fixed;
c) push button portable;
d) pull switch portable.
This standard also gives guidance on automatically-activated trigger devices. For the
requirements and tests applicable to such trigger devices, references are made to appropriate
ISO/IEC standards for fire alarm, gas alarm and intruder alarm system components.
This standard does not specify EMC emission or electrical safety requirements. These are
covered by other standards.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
IEC 60341-1:1970, Push button switches – Part 1: General requirements and measuring
methods
IEC 61020-1:2009, Electromechanical switches for use in electrical and electronic equipment
– Part 1: Generic specification
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 62851-1, Alarm and electronic security systems – Social alarm system – Part 1: System
requirements
______________
This publication was withdrawn and replaced by IEC 61020 series.

– 8 – IEC 62851-2:2014 © IEC 2014
IEC 61779-1:1998, Electrical apparatus for the detection and measurement of flammable
gases – Part 1: General requirements and test methods
IEC 61779-2:1998, Electrical apparatus for the detection and measurement of flammable
gases – Part 2: Performance requirements for group I apparatus indicating a volume fraction
up to 5% methane in air
IEC 61779-3:1998, Electrical apparatus for the detection and measurement of flammable
gases – Part 3: Performance requirements for group I apparatus indicating a volume fraction
up to 100% methane in air
IEC 61779-4:1998, Electrical apparatus for the detection and measurement of flammable
gases – Part 4: Performance requirements for group II apparatus indicating a volume fraction
up to 100% lower explosive limit
IEC 61779-5:1998, Electrical apparatus for the detection and measurement of flammable
gases – Part 5: Performance requirements for group II apparatus indicating a volume fraction
up to 100% gas
EN 54 (all parts), Fire alarm system components (CEN standards)
EN 300 220-2:2010, Electromagnetic compatibility and Radio spectrum Matters (ERM) – Short
range devices – Technical characteristics and test methods for radio equipment to be used in
the 25 MHz to 1 000 MHz frequency range with power levels ranging up to 500 mW – Part 2:
Supplementary parameters not intended for regulatory purposes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62851-1, as well as
the following apply.
3.1
activity monitoring trigger device
an alarm function that operates automatically when a routine activity of the user, being
monitored by a trigger device, is modified or omitted within a specified period
3.2
fault warning signal
any signal transmitted by a trigger device to indicate battery low or faulty condition of the
trigger
3.3
fire alarm trigger
a component of a fire detection system that provides an alarm triggering signal to be received
and processed by the local unit and controller
3.4
fixed trigger device
a trigger device in a fixed position in relation to the local unit or building
3.5
gas alarm trigger
a component of a gas detection system that provides an alarm triggering signal to be received
and processed by the local unit and controller

3.6
interconnection
a transmission system that provides the communication between trigger devices and local unit
and controller
3.7
portable trigger device
a trigger device carried by the user and providing wire-free communication
3.8
user
a person living at home at risk
4 Manually-activated trigger devices
4.1 General requirements
A manually-activated trigger device may be fixed or portable. The requirements for the design,
function and testing of the different types of manually-activated trigger devices are minimum.
a) The fixed trigger device shall be capable of generating an alarm triggering signal, either
by cable or wire-free means, which is capable of being decoded by the local unit or
controller.
b) The portable trigger device shall be capable of generating an alarm triggering signal, by
wire-free means, which is capable of being decoded by the local unit or controller and
distinguishable from fixed trigger devices and automatically-activated trigger devices.
c) When the only function of a portable trigger is to be used as part of a social alarm system
it shall be powered from primary (non-rechargeable) batteries.
d) The wire-free radio transmitter type of trigger device and associated receiver or local unit
or controller shall fulfil the requirements of the local countries appropriate radio regulatory
requirements and any other standards that are applicable.
e) The wire-free radio transmitter type of trigger device shall transmit an identification code
with one out of a minimum of 256 different combinations when an alarm triggering signal
is generated.
4.2 Functional requirements
4.2.1 General
A trigger device shall be non-latching and require a single push or pull action by the user.
4.2.2 Trigger device with internal primary batteries
Primary batteries shall have a capacity large enough to ensure correct functioning of the
trigger device. After 12 months of normal operation, with 1 activation per day of the trigger
device, it shall still be possible to generate an alarm output signal which is capable of being
detected by the local unit or controller.
The trigger device shall be capable of generating a fault warning signal to the local unit or
controller when the trigger is activated before the battery voltage has decreased to the lower
limit specified for the d.c. supply input voltage (V min.) by the manufacturer.
B
4.2.3 Trigger device with internal power supply connected to the a.c. mains and
sealed rechargeable batteries
Requirements for trigger devices with internal power supply connected to the a.c. mains and
sealed rechargeable batteries are the following:

– 10 – IEC 62851-2:2014 © IEC 2014
a) The power supply shall be capable of operating correctly within variations in the a.c.
mains of +10 % to –15 % of the nominal voltage.
b) Within the allowed variations of the a.c. mains voltage there shall be no discharge of the
battery when the trigger device is in normal condition.
c) If the a.c. mains is interrupted the trigger device shall automatically be switched to the
battery without any disconnections of the supply current.
d) The capacity of the fully charged battery shall be large enough to ensure correct
functioning of the trigger device. After 24 h of battery operation in normal operating
condition, it shall be possible to generate an alarm output signal which is capable of being
detected by the local unit or controller.
e) A fully discharged battery shall be recharged to at least 80 % of its nominal capacity
within 24 h and to its rated capacity within another 48 h.
f) The trigger device shall be capable of giving a fault warning signal to the local unit or
controller within 2 h of the a.c. mains supply failure period.
g) The trigger device shall have a visual indication of normal a.c. supply.
4.2.4 Push button fixed or portable type
The trigger push button shall be more prominent than, and clearly distinguishable from, other
buttons by colour and size.
4.2.5 Push button fixed type
The trigger push button shall have a minimum trigger activation area of 200 mm with a
minimum dimension of not less than 5 mm.
4.2.6 Pull switch fixed type
The pull switch type of trigger shall comprise of at least one handle connected to the pull
switch body by a rigid or flexible link.
4.2.7 Push button portable type
The trigger push button shall have a minimum activation area of 150 mm with a minimum
dimension of not less than 5 mm.
5 Test of manually-activated trigger devices
5.1 Test categories
The tests are divided into 3 categories:
a) functional tests according to 5.5;
b) wire-free radio transmission measurements according to 5.6;
c) environmental tests according to 5.7.
5.2 Standard atmospheric condition for testing
Unless otherwise specified, the atmospheric condition in the laboratory shall be the standard
atmospheric conditions for measurements and tests, specified in 5.3.1 of IEC 60068-1:1988
as follows:
– Temperature: 15 °C to 35 °C;
– Relative humidity: 25 % to 75 %;
– Air pressure: 86 kPa to 106 kPa (860 mbar – 1 060 mbar).

5.3 Number of trigger devices used for testing
Generally, sequential testing (the same trigger device used for all tests) is not required, but
may be accepted if only a few trigger devices are available. Wherever possible a trigger
device should only be subject to one endurance test. If more trigger devices are available, the
time required for the testing, and the stress of the individual trigger devices, may be
minimized.
The tests may be carried out in any order.
The required minimum number of the different types of trigger devices to be available for a
test depends on the type of trigger device and the environmental group to be specified for that
device (see 5.7.2).
It is recommended that three out of the total number of trigger devices available for the type
testing are always designated for the functional tests and that a further three devices are
designated for the free field transmission test if the trigger device uses wire-free transmission.
5.4 General conditions for tests
5.4.1 Triggers using cable transmission
5.4.1.1 Mounting and orientation
Unless otherwise stated in a test procedure, the trigger device under test shall be mounted in
its normal orientation by the normal means of mounting indicated by the manufacturer, and
except where required for functional testing, the trigger device shall be in its normal condition
(not activated).
5.4.1.2 Electrical connections
The test set-up used during functional and environmental tests depends on the type of power
source and the type of alarm output circuit used for the trigger device.
a) If the test procedure requires the trigger device to be in the operating condition, it shall
always be connected to the a.c. mains or powered with d.c. from internal or external
power supply, or from the local unit or controller, as specified by the manufacturer.
b) Unless otherwise required in the test procedure the a.c. mains voltage or d.c. supply
voltage for the trigger device under test shall be adjusted to its nominal value.
c) The trigger device shall, unless otherwise stated in the test procedure, signal to an
appropriate local unit or controller. During some of the function tests, or if the trigger
device is only a contact function in a fixed trigger device, it may signal to a test equipment
which is able to monitor the status of the trigger device.
d) If the trigger device is provided with separate outputs for external indicators or control
circuits, except for outputs to the local unit or controller, it shall also be possible to
monitor these outputs during testing.
5.4.2 Triggers using wire-free transmission
5.4.2.1 Mounting and orientation
Unless otherwise stated in the test procedure, the trigger device under test, as well as the
local unit or controller used for functional testing, shall be mounted in test fixtures and
interconnected as described in Annex C (normative), during the functional tests as well as
during the environmental tests.
5.4.2.2 Electrical connections
Unless otherwise specified trigger device shall be provided with fresh batteries before start of
testing.
– 12 – IEC 62851-2:2014 © IEC 2014
As the local unit or controller is not part of the test specimen, the local unit or controller shall
be powered, during all tests, with the nominal a.c. or d.c. supply voltage as specified by the
manufacturer.
5.5 Functional tests
5.5.1 Triggers using cable transmission
5.5.1.1 Power supply powered from primary (non-rechargeable) batteries
V max., V nom. and V min. used in the functional test below shall be specified by the
B B B
manufacturer prior to the testing.
a) Disconnect the batteries and power the trigger device from an external variable d.c.
supply.
b) With the d.c. supply voltage adjusted to nominal battery voltage V nom. check that the
B
trigger functions correctly in normal (output not activated) condition as well as alarm
(output activated) condition.
c) Repeat b) with the d.c. supply voltage adjusted to maximum battery voltage V max.
B
d) Adjust the d.c. supply voltage to the minimum battery voltage V min. ± 1 % as specified
B
by the manufacturer of the trigger device, and check that the trigger functions correctly.
Activate the trigger device and check that it goes into alarm condition (output activated)
and that the battery low warning signal is initiated.
5.5.1.2 Measurements of contact and insulation resistances for mechanical contact
function
This subclause only applies to trigger devices if the alarm output circuit of the trigger device is
a mechanical contact function (e.g. mechanical switch or relay) with no electronic circuits
used for fault monitoring or for generating the output alarm.
The contact and insulation resistances shall be measured according to Annex A (normative)
for all test samples delivered for testing before the start of any other tests.
Criteria for compliance:
a) For each type of contact in the trigger device, the contact resistance measured by each of
the measurements shall be less than 100 mΩ. Possible faults experienced during the
measurements shall also be noted in the test report.
b) For each type of contact in the trigger device, the insulation resistance shall be not less
than 10 MΩ.
5.5.2 Triggers using wire-free transmission
5.5.2.1 General
Unless otherwise specified the function tests are carried out with the trigger device and the
local unit or controller mounted in the rf-shielded test fixtures as described in 5.4.2.
NOTE If this is not possible during certain tests, care is taken to prevent all unwanted radio signal interferences
from activating the local unit or controller e.g. testing in a shielded room.
5.5.2.2 Power supply powered from primary (non-rechargeable) batteries
V max., V nom. and V min. used in the functional test below shall be specified by the
B B B
manufacturer prior to the testing.
a) Disconnect the batteries and power the trigger device from an external variable d.c.
supply.
The trigger device and local unit shall be mounted in its normal orientation and the
shielded test fixtures shall not be used.
Before the test is started ensure that a fault warning or alarm triggering signal transmitted
from the trigger device will be received and decoded by the local unit or controller.
b) With the d.c. supply voltage adjusted to nominal battery voltage V nom. check that the
B
trigger functions correctly in normal (output not activated) condition as well as alarm
(output activated) condition.
c) Repeat b) with the d.c. supply voltage adjusted to maximum battery voltage V max.
B
d) Adjust the d.c. supply voltage to the minimum battery voltage V min. ± 1 % as specified
B
by the manufacturer of the trigger device, and check that the trigger functions correctly.
Activate the trigger device and check that it goes into alarm condition (output activated)
and that the battery low warning signal is initiated.
5.5.3 Fixed trigger type
The following requirements are necessary:
a) The charger shall be able to charge the battery automatically.
b) A battery discharged to its final voltage shall be recharged to at least 80 % of its rated
capacity within 24 h and to its rated capacity within another 48 h.
c) The charging characteristics shall automatically be regulated as a function of ambient air
temperature within the battery manufacturer´s specification over the ambient temperature
range of the battery.
d) There shall be no current consumption from the battery when the trigger power supply is
powered from the a.c. mains with voltage variations between +10 % to –15 % of its
nominal value and the trigger device in normal condition.
5.5.4 Portable trigger with neckband relief (anti-strangle) device
Portable devices with a neck band shall incorporate a strain relief (anti-strangle) device which
shall break when subjected to a certain force. During this test the trigger device shall be
mounted in its normal orientation.
The test jig as shown in Figure B.1 is used for testing of the strain relief with the following
criteria for compliance:
a) the anti-strangle device shall not be in contact with the fixed pivots during testing;
b) when a force of 25 N is applied vertically downwards for 60 s the strain relief device shall
not break;
c) when a force of 40 N is applied vertically downwards the strain relief device shall break
within 5 s.
5.5.5 Push button fixed trigger types
5.5.5.1 General
Unless otherwise stated in this subclause all the forces shall be constantly applied for 4 s or
until the trigger device is activated during the 4 s. If the trigger device is activated by the force
this shall occur within the first 2 s after the force is applied.
5.5.5.2 Activation force limits
The button shall activate the trigger device with a force of 5 N or more and it shall not activate
the trigger device with a force of 1 N or less when tested as follows:
a) with a 10 mm diameter rigid rod with a hemispherical end positioned over the centre of the
button, and a force of 1 N applied on the axis of operation neither the switch nor the
trigger device shall activate;

– 14 – IEC 62851-2:2014 © IEC 2014
b) with a force of 5 N applied, using the same rod, it shall activate the switch and
subsequently the trigger device;
c) repeat the test at four other locations on the perimeter of the button. Each location shall
be at the maximum distance from each other.
5.5.5.3 Mechanical endurance test
The mechanical endurance tests are conducted as follows:
a) When a force of 5 N is applied to the centre of the button as described in 5.5.5.2 a) the
trigger device shall activate.
b) Repeat the test five times. The trigger device shall activate successfully each time.
c) Disconnect the monitoring equipment from the output of the trigger.
d) Apply a force of 5 N to the centre of the button and repeat the test 1 000 times.
e) Reconnect the monitoring equipment and repeat test a) above five times. The trigger
device shall activate successfully each time.
5.5.6 Push button portable trigger types
5.5.6.1 General
Unless otherwise stated in this subclause all the forces shall be constantly applied for 4 s or
until the trigger device is activated during the 4 s. If the trigger device is activated by the force
this shall occur within the first 2 s after the force is applied.
5.5.6.2 Activation force limits
The button shall activate the trigger device with a force of 10 N or more and it shall not
activate the trigger device with a force of 0,5 N or less when tested as follows:
a) with a 10 mm diameter rigid rod with a hemispherical end positioned over the centre of the
button, and a force of 0,5 N applied on the axis of operation neither the switch nor the
trigger device shall activate;
b) with a force of 10 N applied, using the same rod, it shall activate the switch and
subsequently the trigger device.
5.5.6.3 Mechanical endurance test
The mechanical endurance tests are conducted as follows:
a) When a force of 10 N is applied to the center of the button as described in 5.5.6.2 the
trigger device shall activate.
b) Repeat the test five times. The trigger device shall activate successfully each time.
c) Disconnect the monitoring equipment from the output of the trigger.
d) Apply a force of 10 N to the centre of the button and repeat the test 1 000 times.
e) Reconnect the monitoring equipment and repeat test a) above five times. The trigger
device shall activate successfully each time.
5.5.7 Pull switch fixed trigger type
5.5.7.1 General
Unless otherwise stated in this subclause all the forces shall be constantly applied for 4 s or
until the trigger device is activated during the 4 s. If the trigger device is activated by the force
this shall occur within the first 2 s after the force is applied.

5.5.7.2 Activation force limits
The pull switch trigger shall activate the trigger device when the handle is pulled downwards
at angles of up to 30 degrees from the vertical when a force of 20 N or more is applied in the
direction of the link away from the switch. The pull switch shall not activate the trigger device
when a force of 4 N or less is applied.
5.5.7.3 Constant force limit
The pull switch trigger shall be capable of withstanding a vertical force of 50 N applied to the
handle for a period of 60 s without measuring any damage and the trigger device shall
activate normally.
5.5.7.4 Mechanical endurance test
The mechanical endurance tests are conducted as follows:
a) When a force of 20 N is applied to the handle at an angle of 30 degrees from the vertical
in the direction of the link as described in 5.5.7.2 the trigger device shall activate.
b) Repeat the test five times. The trigger device shall activate successfully.
c) Disconnect the monitoring equipment from the output of the trigger.
d) Apply a force of 20 N to the handle at an angle of 30 degrees from the vertical in the
direction of the link and repeat the test 1 000 times.
e) Reconnect the monitoring equipment and repeat test a) five times. The trigger device shall
activate successfully.
5.5.8 Pull activated portable trigger
5.5.8.1 General
Unless otherwise stated in this subclause all the forces shall be constantly applied for 4 s or
until the trigger
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