EN ISO 19432:2012

SLOVENSKI STANDARD
01-oktober-2012
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SIST EN ISO 19432:2008
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Building construction machinery and equipment - Portable, hand-held, internal
combustion engine driven cut-off machines - Safety requirements (ISO 19432:2012)
Baumaschinen und -ausrüstungen - Tragbare, handgeführte Trennschleifmaschinen mit
Verbrennungsmotor - Sicherheit und Prüfungen (ISO 19432:2012)
Machines et matériels pour la construction des bâtiments - Tronçonneuses à disque,
portatives, à moteur à combustion interne - Exigences de sécurité (ISO 19432:2012)
Ta slovenski standard je istoveten z: EN ISO 19432:2012
ICS:
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 19432
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2012
ICS 91.220 Supersedes EN ISO 19432:2008
English Version
Building construction machinery and equipment - Portable,
hand-held, internal combustion engine driven cut-off machines -
Safety requirements (ISO 19432:2012)
Machines et matériels pour la construction des bâtiments - Baumaschinen und -ausrüstungen - Tragbare,
Tronçonneuses à disque, portatives, à moteur à handgeführte Trennschleifmaschinen mit
combustion interne - Exigences de sécurité (ISO Verbrennungsmotor - Sicherheitsanforderungen (ISO
19432:2012) 19432:2012)
This European Standard was approved by CEN on 23 June 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19432:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .4

Foreword
This document (EN ISO 19432:2012) has been prepared by Technical Committee ISO/TC 195 "Building
construction machinery and equipment" in collaboration with Technical Committee CEN/TC 151 “Construction
equipment and building material machines - Safety” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by January 2013, and conflicting national standards shall be withdrawn at
the latest by January 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 19432:2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19432:2012 has been approved by CEN as a EN ISO 19432:2012 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the normative clauses of
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the
relevant Essential Requirements of that Directive and associated EFTA regulations.
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the
scope of this standard.
INTERNATIONAL ISO
STANDARD 19432
Second edition
2012-07-15
Building construction machinery and
equipment — Portable, hand-held,
internal combustion engine driven cut-off
machines — Safety requirements
Machines et matériels pour la construction des bâtiments —
Tronçonneuses à disque, portatives, à moteur à combustion interne —
Exigences de sécurité
Reference number
ISO 19432:2012(E)
©
ISO 2012
ISO 19432:2012(E)
©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 19432:2012(E)
Contents Page
Foreword . iv
Introduction . v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Safety requirements and verification . 4
4.1  General . 4
4.2  Handles . 5
4.3  Spindle speed . 5
4.4  Engine-starting device . 5
4.5  Engine-stopping device . 6
4.6  Throttle control system . 6
4.7  Clutch . 8
4.8  Exhaust gases . 8
4.9  Cutting-debris discharge . 8
4.10  Fuel and oil system . 9
4.11  Protection against contact with parts under high voltage . 9
4.12  Transmission cover(s) . 10
4.13  Protection against contact with hot parts . 10
4.14  Cut-off wheel guard . 12
4.15  Flange locking device . 13
4.16  Flange assembly . 13
4.17  Spindle diameter . 15
4.18  Special tools . 15
4.19  Noise . 15
4.20  Vibration . 15
4.21  Electromagnetic immunity . 16
5  Information for use . 16
5.1  Instruction handbook . 16
5.2  Markings . 19
5.3  Warnings . 20
Annex A (normative) Strength test of cut-off wheel guard . 21
Annex B (normative) Noise test code — Engineering method (grade 2 of accuracy) . 23
Annex C (normative) Measurement of vibration values at the handles . 31
Annex D (normative) Cut-off machine positions . 38
Annex E (informative) Summary of results from round-robin tests (2007 and 2008) on one cut-off
machine . 40
Annex F (informative) List of significant hazards . 41
Bibliography . 43

ISO 19432:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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.
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.
ISO 19432 was prepared by Technical Committee ISO/TC 195, Building construction machinery and
equipment.
This second edition cancels and replaces the first edition (ISO 19432:2006), which has been technically
revised, primarily concerning:
 additional requirement for starting device (4.4);
 throttle trigger (4.6);
 unintentional movement (4.6.2);
 throttle lock (4.6.3);
 additional requirements for tank strength (4.10);
 additional requirements for transmission cover (4.12);
 clarification of the parts to be recognized as hot parts, including temperature limits (4.13.1);
 additional requirement for electromagnetic immunity;
 added requirement for declaration of uncertainties to noise and vibration values (5.1.1, B.8 and C.10);
 modifications in required markings (5.2) and warnings (5.3) including durability requirements for labels;
 modified calculation of values for equivalent sound power, sound pressure and hand vibration (Annexes B
and C);
 stricter specification for accelerometer mounting (C.4.3) and position (C.5);
 inclusion of a simulated feeding force to the vibration test procedure (C.8);
 definition of machine positions (Annex D);
 additional information on reproducibility for noise and vibration measurements (Annex E);
 a new informative Annex F covering a list of significant hazards.
iv © ISO 2012 – All rights reserved

ISO 19432:2012(E)
Introduction
This International Standard is a type-C standard as stated in ISO 12100.
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.
INTERNATIONAL STANDARD ISO 19432:2012(E)

Building construction machinery and equipment — Portable,
hand-held, internal combustion engine driven cut-off
machines — 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, cut-off machines, intended to be
used by a single operator in the cutting of construction materials, such as asphalt, concrete, stone and metal.
It is applicable only to those machines designed purposely for use with a rotating, bonded-abrasive and/or
super-abrasive (diamond) cut-off wheel having a maximum outer diameter of 430 mm, centre-mounted on,
and driven by, a spindle shaft, where the top of the wheel rotates away from the operator (see Figure 1).
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 F 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.
Cut-off wheel specifications are not considered in this International Standard; for such specifications, see, for
1 12 15
example, ISO 603-7 , ISO 13942 and ISO 22917 .
This International Standard is not applicable to machines manufactured before the date of its publication.
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.
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 7293, Forestry machinery — Portable chain-saws — Engine performance and fuel consumption
ISO 7914:2002, Forestry machinery — Portable chain-saws — Minimum handle clearance and sizes
ISO 8041, Human response to vibration — Measuring instrumentation
ISO 19432:2012(E)
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/TR 11688-1, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning
ISO 12100: 2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857:2008, 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, Methods for the calibration of vibration and shock transducers — Part 1: Basic concepts
ISO 20643:2005, Mechanical vibration — Hand-held and hand-guided machinery — Principles for evaluation
of vibration emission
IEC 60745-1:2006, Hand-held motor-operated electric tools — Safety — Part 1: General requirements
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100 and the following apply.
3.1
cut-off wheel
wheel composed of abrasive particles bonded together by an appropriate binder and incorporating, if
necessary, some appropriate form of reinforcement, or made of metal or other materials of similar properties
and having diamond, CBN particles or other suitable abrasive particles bonded to its rim
3.2
arbor hole
centre hole of the cut-off wheel used for mounting the cut-off wheel on the machine spindle
3.3
blotter
washers made from some compressible material (e.g. paper, card or similar), attached to each side of the
cut-off wheel, the function of which is to smooth imperfections in the cut-off wheel and allow a limited degree
of slip when the wheel stalls in use
3.4
choke
device for enriching the fuel air mixture in the carburettor, to aid starting
3.5
clutch
device for connecting and disconnecting the driven member to and from a rotating source of power
3.6
cut-off wheel guard
partial enclosure intended to deflect cutting debris, as well as pieces of the cut-off wheel in the event that the
wheel is broken in operation
2 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
3.7
engine-stopping device
device by which the stopping of the engine is initiated
3.8
flange contact surface
area between the inner and outer circumference on the flange, which forms the contact surface between the
flange and the cut-off wheel
3.9
flange assembly
device provided to clamp and drive the cut-off wheel
3.10
handle
device designed to facilitate safe and easy control of the machine
3.10.1
front handle
handle located at or towards the front of the engine housing
3.10.2
rear handle
handle located at or towards the rear of the engine housing
3.11
idle speed
speed at which the engine runs with no load and throttle trigger released and the cut-off wheel does not rotate
3.12
reactive movement
sudden and unexpected motion of the machine, which can occur when the rotating cut-off wheel contacts a
foreign object during cutting or because of pinching
3.13
maximum depth of cut
t
distance to which the cut-off wheel can enter the work-piece, as measured from the outer diameter of the
wheel to the outside diameter of the flange
3.14
maximum cut-off wheel speed
maximum permitted speed of a new cut-off wheel marked on the cut-off wheel
3.15
maximum spindle speed
maximum speed at which the spindle rotates with a fully open throttle and no load
3.16
muffler
device for reducing engine exhaust noise and directing the exhaust gases
3.17
rated speed
engine speed at which maximum power occurs
3.18
spindle
shaft of the cut-off machine, which supports, retains and drives the cut-off wheel in connection with the flanges
ISO 19432:2012(E)
3.19
throttle trigger
device for controlling the engine speed
3.20
throttle lock
device for setting the throttle in a partially open position, to aid starting
3.21
throttle trigger lock-out
device that prevents the unintentional operation of the throttle trigger until manually released
3.22
throttle control linkage
mechanism which transmits motion from the throttle trigger to the throttle control valve
3.23
transmission cover
device between the engine and the cutting equipment designed to prevent unintentional contact with the
transmission
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 for relevant but not significant hazards
which are not dealt with by this International Standard.
The safe running of cut-off machines depends on both the safety requirements according to this clause and
the safe working conditions associated with the use of adequate personal protection equipment (PPE), such
as gloves, leg protection, boots, eye, hearing and head protection equipment, and safe working procedures
(see 5.1).
Cut-off machines shall also be marked according to 5.2 and carry warnings according to 5.3.
The instruction handbook to be provided with the machines shall comply with 5.1.
For protection from contact with moving parts, except the cut-off wheel, any opening shall have a safety
distance to the moving part that meets the requirements of ISO 13857:2008, 4.2.4.1 and 4.2.4.3.
When the machine is placed in its normal resting position (see Figure 1) on a flat horizontal surface, the cut-off
wheel or the guard shall not touch the horizontal plane and the machine shall remain stable.

Figure 1 — Example of cut-off machine placed in a normal position on a flat surface
A method of verification is established for each requirement.
4 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
SAFETY PRECAUTIONS — Some of the tests specified in this International Standard involve
processes that could lead to a hazardous situation. Any person performing tests in accordance with
this International Standard should be appropriately trained in the type of work to be carried out. All
national regulatory conditions and health and safety requirements must be followed.
4.2 Handles
4.2.1 Requirements
Cut-off machines shall have a handle for each hand. These handles shall be designed so that they
 can be fully gripped by an operator when wearing protective gloves,
 provide the necessary sureness of grip by their shaping and surface, and
 conform to the dimensions and clearances, except distances B and C, given in ISO 7914:2002, Table 1,
for tree work service.
Cut-off machines with a system to isolate the machine vibration from the handles shall be designed so that the
operator is able to stop the engine in a controlled manner with the engine-stopping device, even in the event
of partial or full failure of the vibration isolators.
4.2.2 Verification
Dimensions shall be verified by measurements. The ability to control the machine if a failure occurs in the
vibration isolators shall be verified by inspection of the design and function test.
4.3 Spindle speed
4.3.1 Requirement
Engine speed shall be limited so that it is not possible to accelerate the engine so that the maximum spindle
speed (see 5.1) is exceeded.
4.3.2 Verification
The spindle speed shall be measured at the spindle with fully open throttle and no load. The maximum
allowed inaccuracy is 5 r/min.
NOTE Simple calculations using the engine speed and the transmission ratio cannot be permitted due to the potential
for slippage in the energy transmission from the engine to the shaft.
4.4 Engine-starting device
4.4.1 Requirements
The engine-starting device shall be an electric starter or a manual starter. The actuator for the manual starter
shall be permanently attached to the machine.
The cut-off machine with a manual starter shall have a recoil device for the rope.
To activate the electrical starting device, two or more separate and dissimilar actions shall be required. This
also applies to manual starting devices with stored energy.
ISO 19432:2012(E)
4.4.2 Verification
The means to start the cut-off machine shall be verified by inspection and a functional test.
4.5 Engine-stopping device
4.5.1 Requirements
The machine shall be fitted with an engine-stopping device by which the engine can be brought to a final stop
and which does not depend on sustained manual effort for its operation. The control for this device shall be so
positioned that it can be operated by the operator's hand while holding the rear handle and wearing protective
gloves.
The colour of the control shall contrast clearly with the background of the engine-stopping device.
4.5.2 Verification
The function of the engine-stopping device shall be verified by inspection while the machine is being operated.
The control location and colour shall be verified by inspection.
4.6 Throttle control system
4.6.1 Dimensions
4.6.1.1 Requirements
The throttle trigger shall be positioned so that it can be pressed and released with a gloved hand while holding
the rear handle by fulfilling the dimensional requirements for clearance around and behind the throttle trigger,
as shown in ISO 7914:2002, Figures 3 and 4.
4.6.1.2 Verification
The dimensions shall be verified by measurement.
4.6.2 Operation
4.6.2.1 Requirements
The cut-off machine shall be provided with a throttle trigger that, when released, automatically reverts to the
idling position unless a throttle lock to aid starting is engaged (see 4.6.3). The throttle trigger shall be retained
in the idling position by the automatic engagement of a throttle trigger lock-out.
After the starting procedure has finished, activation of the throttle trigger, to increase the engine speed to a
point where the cut-off wheel starts to move, shall only be possible after the throttle trigger lock-out has been
disengaged.
The starting procedure is finished when the operator disengages the throttle lock and the engine returns to
idling speed.
Unintentional movement of the cut-off wheel shall be minimized by a throttle control linkage, so designed that
a force applied to the rear handle with the throttle trigger lock-out engaged will not increase the engine speed
to a point where the clutch engages and cut-off wheel movement begins.
6 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
4.6.2.2 Verification
The function of the throttle trigger and throttle trigger lock-out shall be verified by inspection while operating
the machine. The throttle control linkage design shall be verified by applying a force in any direction related to
the plane of the cut-off wheel, on the centre of the rear handle grip and with the machine body secured. The
force shall be equal to three times the weight of the cut-off machine unit with empty tanks, without accessories
and without the cut-off wheel.
4.6.3 Throttle lock
4.6.3.1 Requirement
If a throttle lock is provided to aid starting and its engagement will result in a movement of the cut-off wheel
during starting, it shall be such that it has to be engaged manually and shall be automatically released when
the throttle trigger is operated. Releasing the throttle lock, both with and without operation of the throttle trigger
lock-out, is acceptable.
To prevent risk from unintentional operation, the throttle lock shall be located outside the gripping area of the
handle and require at least two independent motions to engage the throttle lock.
The gripping area of the handle is defined to extend from 25 mm in front of the rear part of the throttle trigger
to 75 mm behind the rear part of the throttle trigger (see Figure 2).
The operational force on the throttle trigger for releasing the throttle lock shall not exceed 25 N.
Dimensions in millimetres
Key
1 rear handle
2 throttle trigger
3 intersection between rear handle and throttle trigger
4 gripping area
Figure 2 — Handle gripping area
4.6.3.2 Verification
The function of the throttle lock shall be verified by inspection and measurement. The force to release the
throttle lock shall be applied within 1 s and measured (5  1) mm in front of the rear part of the throttle trigger
and in the direction of the trigger movement (perpendicular to the rotation radius of the trigger).
ISO 19432:2012(E)
4.7 Clutch
4.7.1 Requirements
The cut-off machine shall have a clutch so designed that the cut-off wheel does not move when the engine
rotates at any speed less than 1,25 times the idling speed.
4.7.2 Verification
The function of the clutch shall be verified by running the engine with any speed up to 1,25 times the idling
speed. If a range is specified in the instruction handbook, the verification shall be done based on the highest
idling speed.
4.8 Exhaust gases
4.8.1 Requirements
The exhaust outlet shall be designed so that the exhaust gases are directed away from the operator when the
machine is held in a typical cutting position, as shown in Figure 3.

Figure 3 — Example of cut-off machine held in typical cutting position
4.8.2 Verification
The location and direction of the exhaust outlet shall be verified by inspection.
4.9 Cutting-debris discharge
4.9.1 Requirements
The cut-off machine shall be designed so that the main stream of cutting debris from the cut-off wheel is
directed away from the operator’s face or upper body when holding the machine in a typical cutting position,
as shown in Figure 3. (See also 4.13.1.)
See 5.1 for required information about instructions for the wheel guard.
4.9.2 Verification
The direction of the cutting debris shall be verified by inspection.
8 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
4.10 Fuel and oil system
4.10.1 Requirements
The fuel tank cap and, if provided, the oil tank cap shall have a retainer to prevent the cap from being lost.
The fuel tank opening shall be at least 20 mm in diameter.
The design of the cap shall be such that no leakage occurs while the machine is at the normal operating
temperature, in all working positions and while being transported.
The fuel tank and, if provided, oil tank filler opening shall be so located that the filling of the tank is not
obstructed by other machine components. It shall be possible to use a funnel.
Tanks and fuel lines shall be integrated in the cut-off saw so that they withstand, without any visible leakage,
the shock that occurs when the complete cut-off machine is impacted onto the ground in accordance with
4.10.2.2.
4.10.2 Verification
4.10.2.1 General
The fuel cap retainer, opening dimensions and the possibility of using a funnel shall be verified by inspection
and measurement. The tightness of the caps shall be verified by inspection while turning the cut-off machine
in any direction. Seepage from fuel tank ventilation systems is not regarded as leakage.
4.10.2.2 Drop test
The cut-off machine shall be impacted onto a concrete surface by dropping it twice, once with the largest
diameter cut-off wheel, as specified in the instruction handbook, and once without the cut-off wheel, at
(5  2) °C.
Before the drop test, install the cut-off wheel and fill the fuel tank and oil tank half full with a mixture of 50 %
glycol and 50 % water (by volume) and condition the cut-off machine at the test temperature for at least 6 h.
Within 60 s of coming out from the conditioning environment, the cut-off machine shall be dropped onto a
concrete surface.
The drop shall be done with the cut-off machine suspended by means of a string attached to the front handle
so that the cut-off wheel plane is vertical and the lowest point of the front handle where it is suspended is
775 mm  5 mm above the concrete surface.
Repeat the test without the cut-off wheel after reconditioning at (5  2) °C for a minimum of 1 h.
Inspect for visible leakage while holding the machine for (30  2) s in each of the positions a) to f) specified in
Figure D.1.
4.11 Protection against contact with parts under high voltage
4.11.1 Requirements
All high-voltage parts of the circuit, including spark-plug terminals, shall be located, insulated or guarded so
that the operator cannot make unintentional contact with them.
Ignition interruption or short-circuiting shall be provided and shall be fitted on the low-voltage side.
ISO 19432:2012(E)
4.11.2 Verification
The location and insulation of the parts under high voltage shall be verified by inspection and using a standard
test finger, in accordance with IEC 60745-1:2006, Figure 1. The ignition interruption or short-circuiting shall be
verified by inspection.
4.12 Transmission cover(s)
4.12.1 Requirements
The moving transmission shall be covered to prevent contact during operation.
Covers whose only function is to guard from unintentional contact shall be fixed guards (detachable by means
of tools).
Fixed guards shall have their fixing system permanently attached to the guard and/or the machine when the
guard is removed.
4.12.2 Verification
The design of fixed guards shall be verified by inspection.
4.13 Protection against contact with hot parts
4.13.1 Requirements
The cylinder or parts in direct contact with the cylinder or muffler shall be protected to avoid unintentional
contact during normal operation of the machine. This applies to parts which are less than 120 mm away from
the far side of the front handle above the machine (see Figure 4) and less than 80 mm from the far side of the
front handle at the sides of the machine (see Figure 5).
It also applies to the area of the muffler which can be contacted by a tangential line between the outer side of
the front handle above the machine and the outer edge of the housing over the muffler, with a length of
120 mm from the front handle (dimension ≥0 in Figure 6).
The protection shall ensure that the area contactable by the cone, as described in 4.13.2, does not exceed
10 cm . The temperature for the parts of the machine as defined above, as well as the protection for the
cylinder, shall not be more than 80 °C for metallic surfaces or 94 °C for plastic surfaces.
[9]
NOTE For further information, see Annex E of ISO 13732-1:2006 .
10 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
Dimensions in millimetres
Key Key
1 muffler 1 muffler
2 front handle 2 front handle
Figure 4 — Required distance between Figure 5 — Required lateral distance between front
front handle and unprotected hot part handle and unprotected hot parts — Plan view
Dimensions in millimetres
Key
1 muffler
2 front handle
3 housing
Figure 6 — Protection against contact with hot parts
4.13.2 Verification
The protection of the cylinder or muffler shall be verified by measuring the required distances. Protection for
the muffler shall be verified by determining the contactable area, by applying the test cone as shown in
Figure 7 with a force of (10 ) N in any direction.
1
ISO 19432:2012(E)
Dimensions in millimetres
Figure 7 — Test cone
4.14 Cut-off wheel guard
4.14.1 Requirements
The machine shall have a cut-off wheel guard that requires the use of a tool for attachment or removal. The
cut-off wheel guard shall cover continuously at least 180° of the circumference of the intended wheels (see
Figure 8). The guard shall remain in its position during normal operation.

Key
t maximum depth of cut
X radial clearance
Figure 8 — Cut-off wheel guard dimensions and maximum depth of cut

If the guard is designed to rotate around the wheel centre, tools shall not be required to perform the
adjustment.
The radial clearance (see Figure 8) between the guard and a cut-off wheel with the maximum outer diameter
(see 5.1) shall not be more than 15 mm, to avoid the possibility of mounting an oversized cut-off wheel. The
radial clearance does not need to be respected along the whole periphery of the guard.
The strength of the cut-off wheel guard shall comply with Annex A and remain functionally intact after the tests.
Minor deformations and superficial damage are accepted. Any fixing devices, such as screws, shall remain
intact.
12 © ISO 2012 – All rights reserved

ISO 19432:2012(E)
The design of the machine shall incorporate a provision for dust reduction resulting from the cutting process
which allows the operator to attach the provision to, for example, water or a vacuum to enable its operation.
4.14.2 Verification
The attachment of the guard and the enclosure of the wheel shall be verified by inspection and measurement
and a functional test. The strength requirements shall be verified by functional testing in accordance with
Annex A. The provisions to reduce the emission of dust shall be verified by inspection and a functional test.
4.15 Flange locking device
4.15.1 Requirements
The flanges shall have positive locking to the spindle to prevent flange rotation on the spindle. The fastening
of the flanges and the cut-off wheel to the spindle shall not be loosened by rotational forces or torque from the
spindle. When applying a torque, M, as specified in 4.15.2, there shall be no movement between the cut-off
wheel and the flanges and the spindle.
4.15.2 Verification
The locking of the flanges to the spindle shall be verified by inspection and the following tests.
a) Attach the cut-off wheel and flanges to the spindle with the specified wheel-fastener tightening torque
(see 5.1.2).
b) Lock the spindle and apply to the cut-off wheel a rotational torque M, in newton metres (N·m), calculated
as follows:
M = 0,4  V  k
where
V is the engine displacement in cubic centimetres (cm );
k is the gear ratio (engine/spindle speed).
c) Repeat the test five times in the normal rotational direction, then five times in the opposite direction of
rotation. Observe for any movement.
4.16 Flange assembly
4.16.1 Requirements
The machine shall be equipped with two flanges (see Figure 9) made of steel or another material having
comparable physical properties and which complies with the dimensions given in Table 1 for all types of cut-
off wheels and Table 2 for superabrasive (diamond) cut-off wheels only. Both flanges shall have the same
outer diameter and the same contact surface.
Flanges according to Table 1 shall always be provided with the machine. Optionally, flanges with dimensions
according to Table 2 may be provided and shall be marked “For superabrasive cut-off wheels only.”.
Flanges will be considered suitable if they are mounted as shown in Figure 9, and loaded with the specified
wheel-fastener tightening torque. The contact surface, w, of the flange shall be flat after the loading.
See also 5.1.2 for required information on the correct combination of flanges and cut-off wheel.
ISO 19432:2012(E)
4.16.2 Verification
The dimensions and radial width of the flanges shall be verified by measurement. After applying the specified
wheel-fastener tightening torque, the flatness of the flanges and the contact with the cut-off wheel shall be
verified by inspection and gauging with a 0,05 mm thick gauge. It shall not be possible to insert the gauge at
any point around the flange circumference between the fla
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