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 19432-1:2020)

This document 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 (for example 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 document 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 document 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 document. Cut-off wheels are deemed to comply to existing cut-off wheel standards.
NOTE    For example see Bibliography.
All through the document, portable, hand-held, internal combustion engine-driven cut-off machines are called "cut-off machines".
This document is not applicable to machines manufactured before the date of its publication.

Baumaschinen und -ausrüstungen - Tragbare, handgeführte Trennschleifmaschinen mit Verbrennungsmotor - Teil 1: Sicherheitsanforderungen für Trennschleifmaschinen mit rotierender an der Antriebsachse montierter Trennschleifscheibe (ISO 19432-1:2020)

Dieses Dokument legt Sicherheitsanforderungen und Maßnahmen für die Prüfung der konstruktiven Gestaltung und des konstruktiven Aufbaus von tragbaren, handgeführten Trennschleifmaschinen mit eingebautem Verbrennungsmotor für den Einmannbetrieb fest, die zum Schneiden von Baumaterialien, wie z. B. Asphalt, Beton, Stein und Metall, bestimmt sind. Es gilt nur für solche Trennschleifmaschinen, die bestimmungsgemäß für den Einsatz mit einer rotierenden Trennschleifscheibe mit einem maximalen Außendurchmesser von 430 mm und mit Trennschleifkörpern aus gebundenen Schleifmitteln und/oder Schleifwerkzeugen (zum Beispiel mit Diamantschleifmitteln) vorgesehen sind, die mittig auf einer Spindelwelle montiert sind und von dieser angetrieben werden, wobei sich die Stirnseite der Trennschleifscheibe in einer vom Bediener abgewandten Richtung dreht (siehe Bild 1).
Dieses Dokument behandelt alle signifikanten Gefährdungen, Gefährdungssituationen oder Gefährdungsereignisse, die auf diese Maschinen zutreffen, wenn sie bestimmungsgemäß und unter den vernünftigerweise vom Hersteller vorhersehbaren Bedingungen des Missbrauchs verwendet werden. (Siehe Anhang F für eine Liste der signifikanten Gefährdungen.)
Dieses Dokument legt Verfahren für die Beseitigung oder Verminderung von Gefährdungen, die sich aus deren Anwendung ergeben, sowie die Art von Informationen über sichere Arbeitspraktiken fest, die mit der Maschine bereitzustellen sind.
Spezifikationen für Trennschleifscheiben werden in diesem Dokument nicht behandelt. Es wird davon ausgegangen, dass Trennschleifscheiben die geltenden Normen für Trennschleifscheiben erfüllen.
ANMERKUNG   Beispiel siehe Literaturhinweise.
In diesem Dokument werden tragbare, handgeführte Trennschleifmaschinen mit eingebautem Verbrennungsmotor generell als „Trennschleifmaschinen“ bezeichnet.
Dieses Dokument gilt nicht für Maschinen, die vor dem Veröffentlichungsdatum dieses Dokuments hergestellt wurden.

Machines et matériels pour la construction des bâtiments - Machines de coupe par abrasion, portatives, à moteur à combustion interne - Partie 1: Exigences de sécurité des tronçonneuses à disque abrasif monté au centre (ISO 19432-1:2020)

Le présent document spécifie les exigences de sécurité et les mesures de vérification, pour la conception et la fabrication de tronçonneuses à disque, portatives, à moteur à combustion interne, conçues pour être utilisées par un seul opérateur, pour couper des matériaux de construction, tels que l'asphalte, le béton, les pierres et le métal. Le présent document s'applique uniquement aux tronçonneuses spécifiquement conçues pour l'utilisation de meules à tronçonner, composées de particules abrasives agglomérées et/ou de particules super-abrasives (par exemple diamant), d'un diamètre extérieur maximal de 430 mm, qui présentent un montage central sur un arbre, sont entraînées par cet arbre et dont la partie supérieure tourne loin de l'opérateur (voir Figure 1).
Le présent document traite de tous les phénomènes, situations et événements dangereux significatifs spécifiques de ces machines lorsque celles-ci sont utilisées dans les conditions prévues et dans des conditions d'utilisation abusive relativement prévisibles par le constructeur. Voir Annexe F pour la liste des phénomènes dangereux significatifs.
Le présent document spécifie les méthodes d'élimination ou de réduction des phénomènes dangereux résultant de leur utilisation ainsi que les informations relatives aux recommandations d'utilisation à fournir avec la machine.
Les spécifications de la meule à tronçonner ne sont pas prises en considération dans le présent document. Les meules à tronçonner sont considérées conformes aux normes de meule à tronçonner en vigueur.
NOTE       Par exemple, voir la Bibliographie.
Dans le document, les machines de coupure à moteur à combustion interne portatives, sont appelées «machines de coupure» portatives.
Le présent document ne s'applique pas aux machines fabriquées avant la date de publication du présent document.

Stroji in oprema za graditev objektov - Prenosni ročni brusni rezalniki z motorjem z notranjim zgorevanjem - 1. del: Varnostne zahteve za rezalne stroje z osno vpetimi krožnimi brusnimi ploščami (ISO 19432-1:2020)

General Information

• Status: Published
• Publication Date: 25-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 91.220 - Construction equipment
• Technical Committee: CEN/TC 151 - Construction equipment and building material machines - Safety
• Drafting Committee: CEN/TC 151/WG 6 - Machines and equipment to process building materials (portable, hand-guided, support-mounted, on rails or self-propelled) - Safety
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 26-Feb-2020
• Completion Date: 26-Feb-2020
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST 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 19432-1:2020)

Relations

• Replaces: EN ISO 19432:2012 - Building construction machinery and equipment - Portable, hand-held, internal combustion engine driven cut-off machines - Safety requirements (ISO 19432:2012)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN ISO 19432:2012
Stroji in oprema za graditev objektov - Prenosni ročni brusni rezalniki z motorjem z
notranjim zgorevanjem - 1. del: Varnostne zahteve za rezalne stroje z osno vpetimi
krožnimi brusnimi ploščami (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 19432-1:2020)
Baumaschinen und -ausrüstungen - Tragbare, handgeführte Trennschleifmaschinen mit
Verbrennungsmotor - Teil 1: Sicherheitsanforderungen für Trennschleifmaschinen mit
um die Antriebsachse rotierender Trennschleifscheibe (ISO 19432-1:2020)
Machines et matériels pour la construction des bâtiments - Machines de coupe par
abrasion, portatives, à moteur à combustion interne - Partie 1: Exigences de sécurité des
tronçonneuses à disque abrasif monté au centre (ISO 19432-1:2020)
Ta slovenski standard je istoveten z: EN ISO 19432-1:2020
ICS:
25.100.70 Brusiva Abrasives
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19432-1
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 91.220 Supersedes EN ISO 19432:2012
English Version
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 19432-1:2020)
Machines et matériels pour la construction des Baumaschinen und -ausrüstungen - Tragbare,
bâtiments - Machines de coupe par abrasion, handgeführte Trennschleifmaschinen mit
portatives, à moteur à combustion interne - Partie 1: Verbrennungsmotor - Teil 1: Sicherheitsanforderungen
Exigences de sécurité des tronçonneuses à disque für Trennschleifmaschinen mit um die Antriebsachse
abrasif monté au centre (ISO 19432-1:2020) rotierender Trennschleifscheibe (ISO 19432-1:2020)
This European Standard was approved by CEN on 26 November 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19432-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
(informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC machinery, and amending
Directive 95/16/EC (recast) [2006 L157] aimed to be covered. 4

European foreword
This document (EN ISO 19432-1:2020) 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 August 2020, and conflicting national standards shall
be withdrawn at the latest by August 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 19432:2012.
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(s).
For the relationship with EU Directive(s) 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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 19432-1:2020 has been approved by CEN as EN ISO 19432-1:2020 without any
modification.
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC machinery, and amending
Directive 95/16/EC (recast) [2006 L157] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/396 to
provide one voluntary means of conforming to essential requirements of Directive 2006/42/EC of the
European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive
95/16/EC (recast) [2006 L157].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and
Directive 2006/42/EC [2006 L157]
Essential Requirements Clause(s)/subclause(s)
Remarks/Notes
of Directive 2006/42/EC of this EN
1.1.2. Principles of safety 4.1
integration
1.1.3. Materials and products 4.8, 4.10, 4.14, 4.15,4.16, 5.1, 5.3, Annex A
1.1.5. Design of machinery to 4.2, 4.4, 4.5, 4.6, 4.8, 4.9, 4.10, 4.11, 4.12,
facilitate its handling 4.14, 4.19, 4.20, 5.1, 5.2
1.1.6. Ergonomics 4.2, 4.4, 4.5, 4.6, 4.10, 5.1, 5.2
1.1.7. Operating positions 4.8, 4.9, 4.10, 4.14, 5.1, 5.3
1.2.1. Safety and reliability of 4.2, 4.4, 4.5, 4.6, 4.10, 4.21
control systems
1.2.2. Control devices 4.2, 4.4, 4.5, 4.6, 4.10
1.2.3. Starting 4.4, 4.7
1.2.4. Stopping 4.5
1.3. Protection against 4.2, 4.3, 4.5, 4.6, 4.7, 5.2, 4.9, 4.12, 4.14, 4.15,
mechanical hazards 4.16, 4.17, 4.18 5.1, Annex A
1.4.2.1. Fixed guards 4.12
1.4.2.3. Adjustable guards 4.14
restricting access
1.5.1. Electricity supply 4.11
1.5.5. Extreme temperatures 4.13, 5.3
1.5.6. Fire 4.10, 5.1, 5.3
Essential Requirements Clause(s)/subclause(s)
Remarks/Notes
of Directive 2006/42/EC of this EN
1.1.2. Principles of safety 4.1
integration
1.5.8. Noise 4.19, Annex B
1.5.9. Vibrations 4.2, 4.20, 5.1, 5.3, Annex C
1.5.13. Emissions of hazardous 4.8, 4.10, 4.14, 5.1, 5.3
materials and substances
1.6. Maintenance 5.1
1.7. Information 5.1, 5.2, 5.3
1.7.1. Information and warnings 5.2, 5.3
on the machinery
1.7.1.1. Information and 5.1, 5.2, 5.3
information devices
1.7.3. Marking of machinery 5.2
1.7.4. Instructions 5
1.7.4.1. General principles for 5.1
the drafting of instructions
1.7.4.2. Contents of the 5.1, Annex B, Annex C
instructions
1.7.4.3. Sales literature 5.1, Annex B, Annex C
2.2. Portable hand-held and/or 4.2, 4.5, 4.6, 4.20, 5, Annex C
hand-guided machinery
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
INTERNATIONAL ISO
STANDARD 19432-1
First edition
2020-01
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
Machines et matériels pour la construction des bâtiments — Machines
de coupe par abrasion, portatives, à moteur à combustion interne —
Partie 1: Exigences de sécurité des tronçonneuses à disque abrasif
monté au centre
Reference number
ISO 19432-1:2020(E)
©
ISO 2020
ISO 19432-1:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 19432-1:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety requirements and verification . 5
4.1 General . 5
4.2 Handles . 6
4.2.1 Requirements . 6
4.2.2 Verification . 9
4.3 Spindle speed . 9
4.3.1 Requirement . 9
4.3.2 Verification . 9
4.4 Engine-starting device . 9
4.4.1 Requirements . 9
4.4.2 Verification .10
4.5 Engine-stopping device .10
4.5.1 Requirements .10
4.5.2 Verification .10
4.6 Throttle control system .10
4.6.1 Dimensions .10
4.6.2 Operation .10
4.6.3 Throttle lock .11
4.7 Clutch.12
4.7.1 Requirements .12
4.7.2 Verification .12
4.8 Exhaust gases .12
4.8.1 Requirements .12
4.8.2 Verification .12
4.9 Cutting-debris discharge .12
4.9.1 Requirements .12
4.9.2 Verification .13
4.10 Fuel tanks, oil tanks and fuel lines .13
4.10.1 Tank filler location and identification .13
4.10.2 Tank filler openings .13
4.10.3 Verification .13
4.11 Protection against contact with parts under high voltage .14
4.11.1 Requirements .14
4.11.2 Verification .14
4.12 Transmission cover(s) .14
4.12.1 Requirements .14
4.12.2 Verification .14
4.13 Protection against contact with hot parts .14
4.13.1 Requirements .14
4.13.2 Verification .16
4.14 Cut-off wheel guard .16
4.14.1 Requirements .16
4.14.2 Verification .17
4.15 Flange locking device .17
4.15.1 Requirements .17
4.15.2 Verification .17
4.16 Flange assembly .18
4.16.1 Requirements .18
ISO 19432-1:2020(E)
4.16.2 Verification .18
4.17 Spindle diameter .19
4.17.1 Requirements .19
4.17.2 Verification .19
4.18 Special tools .19
4.18.1 Requirements .19
4.18.2 Verification .19
4.19 Noise .19
4.19.1 Reduction by design at source and by protective measures .19
4.19.2 Noise measurement .20
4.20 Vibration .20
4.20.1 Reduction by design at source and by protective measures .20
4.20.2 Vibration measurement .20
4.21 Electromagnetic immunity .20
4.21.1 Requirements .20
4.21.2 Verification .20
5 Information for use .21
5.1 Instruction handbook .21
5.1.1 General.21
5.1.2 Technical data .21
5.1.3 Other information .22
5.2 Markings .24
5.3 Warnings .25
5.4 Test of labels .25
5.4.1 General.25
5.4.2 Preparation of test specimens and control specimens .26
5.4.3 Wipe resistance test .26
5.4.4 Adhesion test . . .26
Annex A (normative) Strength test of cut-off wheel guard .28
Annex B (normative) Noise test code — Engineering method (grade 2 of accuracy) .30
Annex C (normative) Measurement of vibration values at the handles .39
Annex D (normative) Cut-off machine positions .46
Annex E (normative) Summary of results from round-robin tests (2007 and 2008) on one
cut-off machine.48
Annex F (informative) List of significant hazards .49
Bibliography .51
iv © ISO 2020 – All rights reserved

ISO 19432-1:2020(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.
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 of the voluntary nature of standards, 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 www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 195, Building construction machinery
and equipment, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 151, Construction equipment and building material machines - Safety, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This first edition of ISO 19432-1 cancels and replaces ISO 19432:2012, which has been technically
revised.
The main changes compared to the previous edition are as follows:
— update of normative references;
— update/revision of terms and definitions;
— revision of handle requirements;
— update of figures;
— revision of requirements for fuel tanks, oil tanks and fuel lines;
— revision of Clause 5, information for use;
— revision of requirements for labels.
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 at www .iso .org/ members .html.
ISO 19432-1:2020(E)
Introduction
This document is a type-C standard as stated in ISO 12100.
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organisations, market surveillance etc.).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, e. g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events
are covered are indicated in the Scope of this document.
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 © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 19432-1:2020(E)
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
1 Scope
This document 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 (for example 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 document 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 document 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 document. Cut-off wheels are deemed to comply
to existing cut-off wheel standards.
NOTE For example see Bibliography.
All through the document, portable, hand-held, internal combustion engine-driven cut-off machines are
called “cut-off machines”.
This document is not applicable to machines manufactured before the date of its publication.
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 7293:1997, Forestry machinery — Portable chain saws — Engine performance and fuel consumption
ISO 19432-1:2020(E)
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 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 16063-1:1998, 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 61672-1:2013, 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, ISO 20643 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp;
— IEC Electropedia: available at http:// www .electropedia .org/ .
3.1
cut-off wheel
wheel designed to be fitted to a hand-held portable cut-off machine and whose peripheral edge cuts
material such as asphalt, concrete, stone and metal
3.1.1
bonded-abrasive wheel
cut-off wheel (3.1) entirely made of abrasive particles bonded together with synthetic resin and
reinforced with glass fibre matting
3.1.2
superabrasive wheel
cut-off wheel (3.1) with diamond grains set into segments secured around the circumference of a steel
core disc (the wheel body)
3.2
arbor hole
centre hole of the cut-off wheel (3.1) used for mounting the cut-off wheel on the machine spindle (3.19)
3.3
blotter
washer made from compressible material (e.g. paper, card or similar), attached to each side of the cut-
off wheel (3.1)
Note 1 to entry: The function of the blotter is to smooth imperfections in the cut-off wheel and to allow a limited
degree of slip when the wheel stalls in use.
2 © ISO 2020 – All rights reserved

ISO 19432-1:2020(E)
3.4
clutch
device for connecting and disconnecting the driven member to and from a rotating source of power
3.5
cut-off wheel guard
partial enclosure intended to deflect cutting debris as well as pieces of the cut-off wheel (3.1) in the
event that the wheel is broken in operation and to reduce the risk of unintentional contact with the cut-
off wheel
3.6
engine-stopping device
device by which the stopping of the engine is initiated
3.7
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 (3.1)
3.8
flange assembly
device provided to clamp and drive the cut-off wheel (3.1)
3.9
handle
device designed to facilitate safe and easy control of the machine
3.9.1
front handle
handle (3.9) located at or towards the front of the engine housing
3.9.2
rear handle
handle (3.9) located at or towards the rear of the engine housing
3.10
idle speed
speed at which the engine runs with no load and throttle trigger (3.21) released and the cut-off wheel
(3.1) does not rotate
3.11
reactive force
force generated in a direction opposite to that in which the wheel is moving at the point of contact
when the spinning cut-off wheel (3.1) is slowed or stopped by frictional contact with any solid object,
including the workpiece, or when it is pinched or bound in the cut
Note 1 to entry: 3.11.1, 3.11.2, and 3.11.3, which further describe these reactions, are based on an abrasive cut-off
wheel rotation with the top of the wheel rotating away from the operator.
3.11.1
rotational force
kickback
attempt of the wheel to move back and up towards the operator when the spinning cut-off wheel (3.1)
is slowed or stopped by frictional contact with any solid object in its upper quadrant, so that if it is
abruptly slowed or stopped by a pinch or binding in the upper quadrant, the wheel can be thrown back
and up towards the operator in a rotational kickback motion
3.11.2
climbing
attempt of the wheel to climb the object being cut when the spinning cut-off wheel (3.1) is slowed or
stopped by frictional contact with any solid object or by a pinch or binding at the front of the wheel
ISO 19432-1:2020(E)
3.11.3
pulling
pull-away
attempt of the wheel to pull away from the operator when the spinning cut-off wheel (3.1) is slowed or
stopped by frictional contact with any solid object or by a pinch or binding at the bottom of the wheel
3.12
gyroscopic force
force caused by the rapid spinning of the cut-off wheel (3.1) that results in opposition to a directional
change of the cut-off machine
3.13
reducing bushing
insert or device used to reduce the hole size in a grinding wheel so that it can be mounted on a smaller
diameter spindle (3.19)
3.14
maximum depth of cut
t
distance to which the cut-off wheel (3.1) can enter the workpiece as measured from the outer diameter
of the wheel to the outside diameter of the flange
3.15
maximum cut-off wheel speed
maximum permitted speed of a new cut-off wheel (3.1) marked on the cut-off wheel
3.16
maximum spindle speed
maximum speed at which the spindle (3.19) rotates with a fully open throttle and no load
3.17
muffler
device for reducing engine exhaust noise and directing the exhaust gases
3.18
rated engine speed
rated speed
engine speed at which maximum power occurs as determined by the manufacturer
3.19
spindle
shaft of the cut-off machine which supports, retains and drives the cut-off wheel (3.1) in connection
with the flanges
3.20
spindle sleeve
device used to increase the spindle (3.19) shaft diameter at the contact area of the abrasive wheel for
mounting an abrasive wheel with a larger diameter arbor hole (3.2)
3.21
throttle trigger
device for controlling the engine speed
3.22
throttle lock
device for setting the throttle in a partially open position to aid starting
3.23
throttle trigger lock-out
device that prevents the unintentional operation of the throttle trigger (3.21) until manually released
4 © ISO 2020 – All rights reserved

ISO 19432-1:2020(E)
3.24
throttle control linkage
mechanism which transmits motion from the throttle trigger (3.21) to the throttle control valve
3.25
transmission cover
device between the engine and the cutting equipment designed to prevent unintentional contact with
the transmission
Key
1 rear handle (3.9.2) 8 front handle (3.9.1)
2 throttle trigger (3.21) 9 cut-off wheel guard (3.5)
3 throttle trigger lock-out (3.23) 10 cut-off wheel (3.1)
4 engine stopping device 11 flange assembly (3.8)
5 fuel tank/fuel tank cap 12 spindle
6 starter 13 foot/standing base
7 muffler (3.17)
Figure 1 — Example of a cut-off machine
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 document.
The safe operation of cut-off machines depends on both complying with the safety requirements of this
clause and using safe working practices. The use of appropriate personal protection equipment (PPE),
such as gloves, leg protection, boots, eye, hearing, dust protection mask and head protection equipment,
are an integral part of safe working practices (see 5.1).
Cut-off machines shall be marked in accordance with 5.2. Cut-off machines 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.
ISO 19432-1:2020(E)
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 2) on a flat horizontal surface, the
cut-off wheel or the guard shall not touch the horizontal surface and the machine shall remain stable.
The requirements for the normal resting position shall be verified by inspection.
Figure 2 — Example of cut-off machine placed in a normal position on a
...