IEC 60335-2-91:2002

INTERNATIONAL IEC
STANDARD
60335-2-91
Second edition
2002-08
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

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base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
60335-2-91
Second edition
2002-08
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

 IEC 2002  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60335-2-91  IEC:2002(E)

CONTENTS
FOREWORD . 4

INTRODUCTION .6

1 Scope . 7

2 Normative references. 7

3 Definitions . 8

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

27 Provision for earthing.16
28 Screws and connections .16
29 Clearances, creepage distances and solid insulation .16
30 Resistance to heat and fire .17
31 Resistance to rusting .17
32 Radiation, toxicity and similar hazards .17
Annexes.22
Annex AA (normative) Principles of guarding.22
Annex BB (normative) Examples of symbols which may be used on lawn trimmers and
lawn edge trimmers .26

60335-2-91 © IEC:2002(E) – 3 –

Bibliography.28

Table AA.1 – Extent of reach.23

Table AA.2 – Values of a and b .24

Table AA.3 – Values of a and b .24

Figure 101 – Guard, lawn trimmer .18

Figure 102 – Guard, lawn edge trimmer .19

Figure 103 – Guard strength test (hand-held appliances) .20

Figure 104 – Cutting head strength test.20
Figure 105 – Cutting means measurement .21
Figure AA.1 – Determination of standard aperture.25

– 4 – 60335-2-91  IEC:2002(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 IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
form of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 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 second edition cancels and replaces the first edition published in 1997. It constitutes a
technical revision.
The text of this part of IEC 60335 is based on the following documents:
FDIS Report on voting
61F/449/FDIS 61F/469/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 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 (2000) of that standard.
NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.
This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for walk-behind and hand-
held electric lawn trimmers and lawn edge trimmers.

60335-2-91 © IEC:2002(E) – 5 –

Where a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies

as far as is reasonable. Where this standard states “addition”, “modification” or “replacement”,

the relevant text in Part 1 is to be adapted accordingly.

NOTE 2 The following numbering system is used

– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;

– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;

NOTE 3 The following print types are used:

– requirements: in roman type;

– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – 60335-2-91  IEC:2002(E)

INTRODUCTION
It has been assumed in the drafting of this international standard that the execution of its

provisions is entrusted to appropriately qualified and experienced persons.

This standard recognizes the internationally accepted level of protection against hazards such

as electrical, mechanical, thermal, fire and radiation of appliances when operated as in

normal use taking into account
...