IEC 60335-2-91:2008

Household and similar electrical appliances - Safety - Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers and lawn edge trimmers

IEC 60335-2-91:2008 deals with the safety of electric powered walk-behind and hand-held lawn trimmers and lawn edge trimmers, with cutting element(s) of non metallic filament line or freely pivoting non metallic cutter(s), with a kinetic energy of not more than 10 J each, used by a standing operator for cutting grass, their rated voltage being not more than 250 V for a.c. or 50 V d.c.. Main changes in this edition include the revised endurance test in Clause 18; Annex B, which allows for battery-powered trimmers; and addition of informative Annexes BB, CC and EE on vibration, noise and safety instructions.

Appareils électrodomestiques et analogues - Sécurité - Partie 2-91: Règles particulières pour les coupe-gazon et les coupe-bordures portatifs et à conducteur à pied

CEI 60335-2-91:2008 Traite de la sécurité des coupe-gazon et des coupe-bordures portatifs et à conducteur à pied électriques comportant un ou plusieurs élément(s) de coupe constitués d'un filament non métallique ou d'une ou plusieurs lames non métalliques à pivotement libre, chacun étant caractérisé par une énergie cinétique inférieure ou égale à 10 J, utilisés par un opérateur debout pour couper de l'herbe, leur tension assignée ne dépassant pas 250 V en courant alternatif ou 50 V courant continu. Les principales modifications de cette édition comprennent l'essai d'endurance révisé de l'Article 18; l'Annexe B, qui prévoit les appareils de coupe alimentés par batterie; et l'ajout des Annexes informatives BB, CC et EE sur les vibrations, le bruit et les instructions de sécurité.

General Information

• Status: Published
• Publication Date: 11-Feb-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 65.060.70 - Horticultural equipment
• Technical Committee: TC 116 - Safety of motor-operated electric tools
• Drafting Committee: MT 3 - TC 116/MT 3
• Current Stage: PPUB - Publication issued
• Start Date: 29-Feb-2008
• Completion Date: 12-Feb-2008

Relations

• Revises: IEC 60335-2-91:2002 - Household and similar electrical appliances - Safety - Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers and lawn edge trimmers
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60335-2-91
Edition 3.0 2008-02
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers
and lawn edge trimmers
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 IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
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IEC 60335-2-91
Edition 3.0 2008-02
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers
and lawn edge trimmers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 65.060.70 ISBN 2-8318-9572-3

– 2 – 60335-2-91 © IEC:2008(E)

CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references .7

3 Definitions .8

4 General requirement.9

5 General conditions for the tests .9
6 Classification.9
7 Marking and instructions.10
8 Protection against access to live parts.11
9 Starting of motor-operated appliances .11
10 Power input and current .11
11 Heating .11
12 Void.11
13 Leakage current and electric strength at operating temperature.11
14 Transient overvoltages .11
15 Moisture resistance .11
16 Leakage current and electric strength.12
17 Overload protection of transformers and associated circuits .12
18 Endurance.12
19 Abnormal operation .12
20 Stability and mechanical hazards .12
21 Mechanical strength .14
22 Construction .15
23 Internal wiring.17
24 Components .17
25 Supply connection and external flexible cords .17
26 Terminals for external conductors.18

27 Provision for earthing .18
28 Screws and connections .18
29 Clearances, creepage distances and solid insulation .18
30 Resistance to heat and fire.18
31 Resistance to rusting.18
32 Radiation, toxicity and similar hazards.19

Annexes .24
Annex B (normative) Appliances powered by rechargeable batteries.24
Annex D (normative) Thermal motor protectors.26
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance.26

60335-2-91 © IEC:2008(E) – 3 –

Annex AA (informative) Safety signs and symbols which may be used on lawn

trimmers and lawn edge trimmers .27

Annex BB (informative) Vibration .29

Annex CC (informative) Noise test code – Engineering method (grade 2) .34

Annex DD (informative) Example of a material and construction fulfilling the

requirements for an artificial surface .40

Annex EE (informative) Safety instructions .42

Bibliography.44

Figure 101 – Guard, lawn trimmer (see 20.101.1) .20
Figure 102 – Guard, lawn edge trimmer (see 20.101.2).21
Figure 103 – Guard strength test (hand-held appliances) .22
Figure 104 – Cutting head strength test (see 21.102).22
Figure 105 – Cutting means measurement (see 22.103) .23
Figure BB.1 – Examples of transducer location/orientation (hand-held trimmers) .32
Figure BB.2 – Examples of transducer location/orientation (walk-behind machines).33
Figure CC.1 – Microphone positions on the hemisphere (see Table CC.1) .35
Figure DD.1 – Sketch of the measurement surface covered with an artificial surface
(not to scale) .41

Table CC.1 – Co-ordinates of microphone positions.36
Table CC.2 – Absorption coefficients .37

– 4 – 60335-2-91 © IEC:2008(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

SAFETY –
Part 2-91: Particular requirements for walk-behind

and hand-held lawn trimmers and lawn edge trimmers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60335-2-91 has been prepared by IEC subcommittee 61F: Safety
of hand-held motor-operated electric tools, of IEC technical committee 61: Safety of
household and similar electrical appliances.
This third edition cancels and replaces the second edition published in 2002. It constitutes a
technical revision. Main changes in this edition include the revised endurance test in
Clause 18; Annex B, which allows for battery-powered trimmers; and addition of informative
Annexes BB, CC and EE on vibration, noise and safety instructions.

60335-2-91 © IEC:2008(E) – 5 –

The text of this standard is based on the following documents:

FDIS Report on voting
61F/710/FDIS 61F/713/RVD
Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments. It was established on the basis of the fourth edition (2
...

IEC 60335-2-91
Edition 3.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers
and lawn edge trimmers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-91: Règles particulières pour les coupe-gazon et les coupe-bordures
portatifs et à conducteur à pied

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 IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
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CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
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in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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IEC 60335-2-91
Edition 3.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers
and lawn edge trimmers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-91: Règles particulières pour les coupe-gazon et les coupe-bordures
portatifs et à conducteur à pied

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 65.060.70 ISBN 2-8318-9999-0
– 2 – 60335-2-91 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Definitions .8
4 General requirement.9
5 General conditions for the tests .9
6 Classification.9
7 Marking and instructions.10
8 Protection against access to live parts.11
9 Starting of motor-operated appliances .11
10 Power input and current .11
11 Heating .11
12 Void.11
13 Leakage current and electric strength at operating temperature.11
14 Transient overvoltages .11
15 Moisture resistance .11
16 Leakage current and electric strength.12
17 Overload protection of transformers and associated circuits .12
18 Endurance.12
19 Abnormal operation .12
20 Stability and mechanical hazards .12
21 Mechanical strength .14
22 Construction .15
23 Internal wiring.17
24 Components .17
25 Supply connection and external flexible cords .17
26 Terminals for external conductors.18
27 Provision for earthing .18
28 Screws and connections .18
29 Clearances, creepage distances and solid insulation .18
30 Resistance to heat and fire.18
31 Resistance to rusting.18
32 Radiation, toxicity and similar hazards.19
Annexes .24
Annex B (normative) Appliances powered by rechargeable batteries.24
Annex D (normative) Thermal motor protectors.26
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance.26
Annex AA (informative) Safety signs and symbols which may be used on lawn
trimmers and lawn edge trimmers .27
Annex BB (informative) Vibration .29

60335-2-91 © IEC:2008 – 3 –
Annex CC (informative) Noise test code – Engineering method (grade 2) .34
Annex DD (informative) Example of a material and construction fulfilling the
requirements for an artificial surface .40
Annex EE (informative) Safety instructions .42
Bibliography.44

Figure 101 – Guard, lawn trimmer (see 20.101.1) .20
Figure 102 – Guard, lawn edge trimmer (see 20.101.2).21
Figure 103 – Guard strength test (hand-held appliances) .22
Figure 104 – Cutting head strength test (see 21.102).22
Figure 105 – Cutting means measurement (see 22.103) .23
Figure BB.1 – Examples of transducer location/orientation (hand-held trimmers) .32
Figure BB.2 – Examples of transducer location/orientation (walk-behind machines).33
Figure CC.1 – Microphone positions on the hemisphere (see Table CC.1) .35
Figure DD.1 – Sketch of the measurement surface covered with an artificial surface
(not to scale) .41

Table CC.1 – Co-ordinates of microphone positions.36
Table CC.2 – Absorption coefficients .37

– 4 – 60335-2-91 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-91: Particular requirements for walk-behind
and hand-held lawn trimmers and lawn edge trimmers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misint
...