prEN ISO 19432-2

SLOVENSKI STANDARD
01-marec-2025
Stroji in oprema za graditev objektov - Prenosni ročni brusni rezalniki z motorjem z
notranjim zgorevanjem - 2. del: Naprave za brušenje verige - Varnostne zahteve
(ISO/DIS 19432-2:2024)
Building construction machinery and equipment - Portable, hand-held, internal
combustion engine driven abrasive cutting machines - Part 2: Machines for abrasive
chains - Safety requirements (ISO/DIS 19432-2:2024)
Baumaschinen und -Ausrüstungen - Tragbare, handgeführte Trennschleifmaschinen mit
Verbrennungsmotor - Teil 2: Maschinen für Schleifketten - Sicherheitsanforderungen
(ISO/DIS 19432-2:2024)
Machines et matériels pour la construction des bâtiments - Machines de coupe par
abrasion, portatives, à moteur à combustion interne - Partie 2: Tronçonneuses à chaîne
abrasive - Exigences de sécurité (ISO/DIS 19432-2:2024)
Ta slovenski standard je istoveten z: prEN ISO 19432-2
ICS:
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 19432-2
ISO/TC 195
Building construction machinery
Secretariat: SAC
and equipment — Portable, hand-
Voting begins on:
held, internal combustion engine-
2024-12-23
driven abrasive cutting machines —
Voting terminates on:
2025-03-17
Part 2:
Machines for abrasive chains —
Safety requirements
Machines et matériels pour la construction des bâtiments —
Machines de coupe par abrasion, portatives, à moteur à
combustion interne —
Partie 2: Tronçonneuses à chaîne abrasive — Exigences de
sécurité
ICS: 91.220
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 19432-2:2024(en)
DRAFT
ISO/DIS 19432-2:2024(en)
International
Standard
ISO/DIS 19432-2
ISO/TC 195
Building construction machinery
Secretariat: SAC
and equipment — Portable, hand-
Voting begins on:
held, internal combustion engine-
driven abrasive cutting machines —
Voting terminates on:
Part 2:
Machines for abrasive chains —
Safety requirements
Machines et matériels pour la construction des bâtiments —
Machines de coupe par abrasion, portatives, à moteur à
combustion interne —
Partie 2: Tronçonneuses à chaîne abrasive — Exigences de
sécurité
ICS: 91.220
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 19432-2:2024(en)
ii
ISO/DIS 19432-2:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
4 Safety requirements and verification . 7
4.1 General .7
4.2 Water supply system .8
4.2.1 General requirements .8
4.2.2 Verification .8
4.3 Protection against broken and/or derailed chains at the rear handle .8
4.3.1 Rear hand guard .8
4.3.2 Chain catcher .11
4.4 Handles .14
4.4.1 Requirements .14
4.4.2 Verification .18
4.5 Front hand guard .19
4.5.1 Requirements .19
4.5.2 Verification . 20
4.6 Engine-starting device . 20
4.6.1 General requirements . 20
4.6.2 Verification . 20
4.7 Engine-stopping device . 20
4.7.1 General requirements . 20
4.7.2 Verification .21
4.8 Throttle control system .21
4.8.1 Throttle trigger/ Throttle trigger lockout .21
4.8.2 Throttle control linkage . 22
4.8.3 Throttle control latch . 22
4.9 Clutch . 23
4.9.1 General requirements . 23
4.9.2 Verification . 23
4.10 Exhaust gases .24
4.10.1 General requirements .24
4.10.2 Verification .24
4.11 Cutting-debris discharge .24
4.11.1 General requirements .24
4.11.2 Verification .24
4.12 Fuel tank and fuel lines . 25
4.12.1 Fuel tank filler location and identification . 25
4.12.2 Fuel tank filler openings . 25
4.12.3 Verification . 25
4.13 Protection against contact with parts under high voltage . 25
4.13.1 Requirements . 25
4.13.2 Verification . 26
4.14 Drive sprocket guard . 26
4.14.1 Requirements . 26
4.14.2 Verification . 26
4.15 Protection against contact with hot parts . 26
4.15.1 Requirements . 26
4.15.2 Verification . 28
4.16 Chain tensioning . 29
4.16.1 Requirements . 29
4.16.2 Verification . 29

iii
ISO/DIS 19432-2:2024(en)
4.17 Special tools . 29
4.17.1 Requirements . 29
4.17.2 Verification . 29
4.18 Noise . 29
4.18.1 Reduction by design at source and by protective measures . 29
4.18.2 Noise measurement . 29
4.19 Vibration . 29
4.19.1 Reduction by design at source and by protective measures . 29
4.19.2 Vibration measurement . 30
4.20 Electromagnetic immunity . 30
4.20.1 Requirements . 30
4.20.2 Verification . 30
5 Information for use .30
5.1 Instruction handbook. 30
5.1.1 General . 30
5.1.2 Technical data . 30
5.1.3 Other information .31
5.2 Marking . 33
5.3 Warning . 33
5.4 Test of labels . 34
5.4.1 General . 34
5.4.2 Preparation of test specimens and control specimens . 34
5.4.3 Wipe resistance test . 35
5.4.4 Adhesion test . 35
Annex A (normative) Noise test code – Engineering method (grade 2 of accuracy) .36
Annex B (normative) Measurement of vibration values at the handles .46
Annex C (normative) Machines for abrasive chains - positions .56
Annex D (informative) List of significant hazards .59
Annex ZA (informative)  . 61
Annex ZB (informative)  .63
Bibliography .65

iv
ISO/DIS 19432-2:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75% of the member bodies casting a vote.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 195, Building construction machinery and
equipment.
ISO 19432 consists of the following parts, under the general title Building construction machinery and
equipment — Portable, hand-held, internal combustion engine driven abrasive cutting machines:
Part 1: Cut-off machines for centre mounted rotating abrasive wheels — Safety requirements
Part 2: Machines for abrasive chains — Safety requirements
A list of all parts in the ISO 19432 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found atwww.iso.org/members.html.

v
ISO/DIS 19432-2:2024(en)
Introduction
This International Standard is a type-C standard as stated in ISO 12100:2010.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are
covered are indicated in the Scope of this International Standard.
When requirements of this type-C standard are different from those which are stated in type-A or -B
standards, the requirements of this type-C standard take precedence over the requirements of the other
standards for machines that have been designed and built according to the requirements of this type-C
standard.
vi
DRAFT International Standard ISO/DIS 19432-2:2024(en)
Building construction machinery and equipment — Portable,
hand-held, internal combustion engine-driven abrasive
cutting machines —
Part 2:
Machines for abrasive chains — Safety requirements
1 Scope
This International Standard specifies safety requirements and measures for their verification for the design
and construction of portable, hand-held, internal combustion engine-driven machines for abrasive chains,
intended to be used by a single operator only in the cutting of construction materials, such as concrete,
stone and metal. It is applicable only to those machines designed purposely for use with a water-cooled
abrasive chain only, where the top of the abrasive chain rotates away from the operator (see Figure 1) and
the water supply system is integrated.
Figure 1 — Machine with abrasive chain
ISO 19432-2 is not applicable to:
“Cut-off machines for centre-mounted rotating abrasive wheels” which are covered by ISO 19432-1.
“Chain saws for forestry service” which are covered by ISO 11681-1.
“Chain saws for tree service” which are covered by ISO 11681-2.
NOTE Clarification of product class. The cutting means is by grinding with an abrasive chain through the
workpiece, using a continuous water supply as a coolant, lubricant and dust suppression. This kind of machinery is not
intended for use with conventional wood cutting saw chains with defined sharpened cutting edges.
This International Standard deals with all significant hazards, hazardous situations or hazardous events
significant to these machines when they are used as intended and under conditions of misuse which are
reasonably foreseeable by the manufacturer. (See Annex A for a list of significant hazards.)
This International Standard specifies methods for the elimination or reduction of hazards arising from their
use, as well as the type of information on safe working practices to be provided with the machines.
This International Standard is not applicable to machines manufactured before the date of its publication.

ISO/DIS 19432-2:2024(en)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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.
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment
ISO 5349-2:2001, Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted
vibration — Part 2: Practical guidance for measurement at the workplace
ISO 6533:2020, Forestry machinery — Portable chain-saw front hand-guard — Dimensions and clearances
ISO 6534:2023, Forestry machinery — Portable chain-saw hand-guards — Mechanical strength
ISO 7293:2021, Forestry machinery — Portable chain-saws — Engine performance and fuel consumption
ISO 7574-4:1985, Acoustics — Statistical methods for determining and verifying stated noise emission values of
machinery and equipment — Part 4: Methods for stated values for batches of machines
ISO 7914:2023, Forestry machinery — Portable chain-saws — Minimum handle clearance and sizes
ISO 7915:2021, Forestry machinery — Portable chain-saws — Determination of handle strength
ISO 8041-1:2017, Human response to vibration — Measuring instrumentation — Part 1: General purpose
vibration meters
ISO 11201:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
ISO 11681-1:2022, Machinery for forestry — Portable chain-saw safety requirements and testing — Part 1:
Chain-saws for forest service
ISO 11681-2:2022, Machinery for forestry — Portable chain-saw safety requirements and testing — Part 2:
Chain-saws for tree service
ISO 11684:2023, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —
Safety labels — General principles
ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and equipment
— Part 1: Planning
ISO 11691:2020, Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory
survey method
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 14982:1998, Agricultural and forestry machinery — Electromagnetic compatibility — Test methods and
acceptance criteria
ISO 16063-1:1998, Methods for the calibration of vibration and shock transducers — Part 1: Basic concepts
ISO 16063-1:1998/Amd 1:2016, Methods for the calibration of vibration and shock transducers — Part 1: Basic
concepts — Amendment 1
ISO/DIS 19432-2:2024(en)
ISO 19432-1:2020, Building construction machinery and equipment — Portable, hand-held, internal combustion
engine-driven abrasive cutting machines — Part 1: Safety requirements for cut-off machines for centre-mounted
rotating abrasive wheels
ISO 22867:2021, Forestry and gardening machinery — Vibration test code for portable hand-held machines
with internal combustion engine — Vibration at the handles
ISO 22868:2021, Forestry and gardening machinery — Noise test code for portable hand-held machines with
internal combustion engine — Engineering method (Grade 2 accuracy)
IEC 61032:1997/COR1:2003, Corrigendum 1 - Protection of persons and equipment by enclosures - Probes for
verification
IEC 61672-1:2013, Electroacoustics - Sound level meters - Part 1: Specifications
EN ISO 5349-2:2001/A1:2015, Mechanical vibration - Measurement and evaluation of human exposure to hand-
transmitted vibration - Part 2: Practical guidance for measurement at the workplace (ISO 5349 2:2001/Amd 1:2015)
EN ISO 13849-1:2023, Safety of machinery - Safety-related parts of control systems - Part 1: General principles
for design (ISO 13849-1:2023)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
Operating position
the typical cutting position is shown in Figure 19
3.2
Water supply system
system, to provide water for cooling and lubrication to the abrasive chain
3.3
Abrasive chain
chain serving as an abrasive tool, consisting of drive links and tie straps held together by rivets with abrasive
elements affixed to the chain assembly
Key
x distance between three adjacent rivets
Figure 2 — Part of abrasive chain

ISO/DIS 19432-2:2024(en)
Key
1 guide bar rail
2 tie strap
3 rivet
4 abrasive element
5 drive link
6 guide bar groove width
7 guide bar
8 chain gauge
Figure 3 — Abrasive chain details
3.4
Drive sprocket
chain drive wheel with teeth
3.5
Guide bar
part that supports and guides the abrasive chain 3.3

ISO/DIS 19432-2:2024(en)
Key
1 lateral plate
2 middle plate
3 water channel
4 water jet/water port
5 nose sprocket
6 cylindrical roller
7 inner racer
8 rivet
Figure 4 — Example of guide bar including details with internal features
3.6
Nose sprocket
rotating part at the tip of the guide bar 3.5 which supports the abrasive chain 3.3 around the tip
3.7
Chain pitch
arithmetic mean of the distances between three adjacent rivets see dimension x in Figure 1
3.8
Chain catcher
device for restraining the abrasive chain 3.3 if it breaks or comes off the guide bar
3.9
Choke
device for enriching the fuel air mixture in the carburettor to aid starting
3.10
Clutch
device for connecting and disconnecting the driven member to and from a rotating source of power
3.11
Engine-stopping device
device by which the stopping of the engine is initiated
3.12
Front handle
handle located at or towards the front of the engine housing
3.13
Rear handle
handle located at or towards the rear of the engine housing

ISO/DIS 19432-2:2024(en)
3.14
Idle speed
speed at which the engine runs with no load and throttle trigger released and the abrasive chain does not rotate
3.15
Muffler
device for reducing engine exhaust noise and directing the exhaust gases
3.16
Rated engine speed
engine speed at which maximum corrected brake power is obtained
3.17
Racing speed
maximum engine speed
3.18
Throttle trigger
device for controlling the engine speed
3.19
Throttle lock
device for setting the throttle in a partially open position to aid starting
3.20
Throttle trigger lock-out
device that prevents the unintentional operation of the throttle trigger until manually released
3.21
Throttle control linkage
mechanism which transmits motion from the throttle trigger to the throttle control valve
3.22
Reactive forces
if the moving abrasive chain is slowed or stopped by frictional contact with any solid object including the
workpiece or if it is pinched or bound in the cut, reactive forces are generated in a direction opposite to that
in which the abrasive chain is travelling at the point of contact. Sub-clauses 3.22.1, 3.22.2, and 3.22.3 which
further describe these reactions are based on the abrasive chain having a direction of travel away from the
operator on the top of the guide bar
Note 1 to entry: For a wood cutting saw chain the cutting edges are designed to feed into the material. This cutting
action itself produces the primary reactive forces. Secondarily, friction produces an additional small amount of
reactive force. Abrasive chains produce reactive forces via friction only. Furthermore, friction in this case is further
reduced by the use of water which is always necessary for cooling, lubrication, flushing and dust suppression.
3.22.1
Pulling
if the abrasive chain on the bottom of the guide bar is slowed or suddenly stopped, the machine may be
pulled forward, away from the operator, toward the workpiece (pull-away)
3.22.2
Pushback
the backward motion of the guide bar, occurring when the chain on the top of the guide bar is slowed or
suddenly stopped. The machine may be pushed back towards the operator, away from the workpiece
(pushback)
3.22.3
Kickback
the rapid backward and upward motion of the guide bar, occurring when the chain on the upper quadrant of
the guide bar nose is slowed or suddenly stopped

ISO/DIS 19432-2:2024(en)
4 Safety requirements and verification
4.1 General
Machinery shall comply with the safety requirements and/or protective measures of this clause. In addition,
the machine shall be designed according to the principles of ISO 12100:2010 for relevant but not significant
hazards which are not dealt with by this International Standard.
The safe operation of machines for abrasive chains depends on both compliance with the safety requirements
of this clause and using safe working practices. The use of appropriate personal protection equipment
(PPE), such as gloves, boots, eye protection, hearing protection, dust protection mask and head protection
equipment, are an integral part of safe working practices (see 5.1).
Machines for abrasive chains shall be marked in accordance with 5.2. Machines for abrasive chains shall
carry warnings in accordance with 5.3.
An instruction handbook shall be provided with the machine and shall comply with the requirements of 5.1.
For protection from contact with moving parts, except the abrasive chain, any opening shall have a safety
distance to the moving part that meets the requirements of clause 4.2.4.1 and 4.2.4.3 within ISO 13857:2019.
When the machine is placed in its normal resting position on flat level ground, the machine shall not tip on
the nose of the guide bar when equipped with the longest guide bar. Additionally the chain shall not be in
contact with the ground when the saw is in stationary position as shown in Figure 5.
Key
1 water connector
2 rear hand guard
3 rear handle
4 throttle trigger
5 throttle trigger lock out
6 front handle
7 muffler
8 leverage point, Front hand guard (optional)
9 leverage point, Spike (optional)
10 guide bar
11 abrasive (diamond) chain
ISO/DIS 19432-2:2024(en)
12 chain catcher
13 drive sprocket cover
14 fuel cap, fuel tank
Figure 5 — Example of machine for abrasive chains placed in a normal position on a flat surface
A method of verification is established for each requirement.
Test according to this standard shall be carried out at room temperature (+20°C ± 5°C) unless otherwise
specified.
WARNING — Some of the tests specified in this document involve processes that could lead to a
hazardous situation. Any person performing tests in accordance with this document should be
appropriately trained in the type of work to be carried out. All national regulatory conditions and
health and safety requirements shall be taken into consideration.
4.2 Water supply system
4.2.1 General requirements
A machine according to this standard shall be equipped with a water supply system integrated in the guide
bar of the machine.
4.2.2 Verification
Requirements shall be verified by visual inspection.
4.3 Protection against broken and/or derailed chains at the rear handle
4.3.1 Rear hand guard
4.3.1.1 General requirements
To protect the user against a broken and/or derailed chain, the machine shall be equipped with a rear hand guard.
The rear hand guard shall meet the dimensional requirements in4.3.1.2 and the strength requirments in
accordance with4.3.1.3
4.3.1.2 Dimension
A rear hand guard shall be provided along the length of the right side of the bottom of the rear handle to
protect the operator’s hand from contact with a broken and/or derailed chain.
The rear hand guard shall extend from the right edge of the handle for at least 30 mm on the guide bar side
(see Figure 9), and
— at least 100 mm lengthwise from the inner rear part of the machine body (see Figure 9), or
— at least three times the diameter of 25 mm behind the throttle trigger, as defined by three cylinders
pressed against the handle and the throttle trigger,
whichever of these options is further back.
This requirement may also be fulfilled by parts of the machine.
4.3.1.3 Strength test requirements
The rear hand guard shall not break or crack when tested in accordance with this clause.

ISO/DIS 19432-2:2024(en)
The rear hand guard shall not deflect far enough to allow the pendulum to swing past.
The test shall be carried out with the machine rigidly held in the upside-down position, held by the guide-
bar mount – see Figure 7.
The impact on the rear hand guard shall be generated by a blow from a pendulum with a steel hammer in
accordance with Figure 6, and an arm with a length giving 700 mm ± 5 mm distance between the swivel
point and the centre of the head. The arm shall be as light as possible. The pendulum system shall cause an
impact corresponding to 10 J ± 0,3 J from a drop height, α, of 400 mm.
- Impact test
The following test shall be conducted one time.
Condition the machine at the test temperature of -5°C ± 2°C for at least 6 h. If the machine has to be removed
from the conditioning environment to perform the test, the test shall be conducted within 60 s of its removal.
Raise the hammer to a drop height α, of 400 mm, corresponding to an impact energy of 10 J ± 0,3 J, and allow
it to fall. The hammer shall strike the hand guard along a line of action forming an angle of 45° ± 5° with the
guide-bar axis, in accordance with Figure 7. Secondary impacts shall be avoided.
The impact point shall be on the intersection of the centreline of the guide-bar and the plane perpendicular
to the guide-bar plane, at an equal distance from the rear end of the throttle trigger and the inner far end
of the handle (see A in Figure 8). In case where the point of intersection is less than 10 mm from the guard
edge, the impact point shall be moved so that the distance from the guard is 10 mm ± 2,5 mm.
Figure 6 — Dimensions of hammer

ISO/DIS 19432-2:2024(en)
Key
a fall height
Figure 7 — Impact test of rear hand guard - fall height
Key
A impact point
Figure 8 — Impact test of rear hand guard - impact point

ISO/DIS 19432-2:2024(en)
Figure 9 — Minimum dimensions of protection at rear handle
4.3.1.4 Verification
Dimensions shall be verified by measurement.
Strength requirements shall be verified by the following test. The test shall be conducted one time.
Condition the machine at the test temperature of -5°C ± 2°C for at least 6 h. If the machine has to be removed
from the conditioning environment to perform the test, the test shall be conducted within 60 s of its removal.
Raise the hammer to a drop height α, of 400 mm, corresponding to an impact energy of 10 J ± 0,3 J, and allow
it to fall. The hammer shall strike the rear hand guard along a line of action forming an angle of 45° ± 5° with
the guide-bar axis, in accordance with Figure 7. Secondary impacts shall be avoided.
The impact point shall be on the intersection of the centreline of the guide-bar and the plane perpendicular
to the guide-bar plane, at an equal distance from the rear end of the throttle trigger and the inner far end
of the handle (see A in Figure 8). In case where the point of intersection is l
...