IEC 60335-2-91:2008
(Main)Household and similar electrical appliances - Safety - Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers and lawn edge trimmers
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
Standards Content (Sample)
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
IEC 60335-2-91:2008
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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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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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
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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
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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,
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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.
This bilingual version, published in 2008-09, corresponds to the English version.
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60335-2-91 © IEC:2008 – 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.
The French version of this standard has not been voted upon.
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 (2001) 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 lawn trimmers and lawn edge trimmers.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When 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;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements proper: 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.
A list of all parts of the IEC 60335 series, under the general title: Household and similar
electrical appliances – Safety, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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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 the manufacturer's instructions. It also covers abnormal
situations that can be expected in practice and takes into account the way in which
electromagnetic phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the appliance is connected to the supply
mains. However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
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60335-2-91 © IEC:2008 – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-91: Particular requirements for walk-behind
and hand-held lawn trimmers and lawn edge trimmers
1 Scope
This clause of Part 1 is replaced by the following.
This International Standard 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.
In this standard, hand-held and walk-behind lawn trimmers and lawn edge trimmers are
referred to collectively as trimmer(s).
So far as is practicable, this standard deals with the common hazards presented by trimmers
which are encountered by all persons in the normal use and reasonably foreseeable misuse of
the trimmers.
NOTE 101 Attention is drawn to the fact that in many countries additional requirements are specified by the
national health authorities, the national authorities responsible for the protection of labour, the national water
supply authorities and similar authorities.
This standard does not apply to
– scissor type or lawn trimmers and lawn edge trimmers with cutting means other than
those described above;
– self-propelled lawn trimmers or lawn edge trimmers;
– lawn trimmers or lawn edge trimmers which do not have a distance of at least 600 mm
between the cutting means control and the cutting head;
– battery-powered trimmers fitted with batteries that have to be removed for charging.
NOTE 102 Requirements for tools with this type of battery can be found in Annexes K and L of IEC 60745-1.
EMC and environmental aspects, except noise, have not been considered in this standard.
NOTE 103 The method of calculating the kinetic energy for the purposes of this standard is given in 22.103.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60320 (all parts), Appliance couplers for household and similar general purposes
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IEC 60320-2-3, Appliance couplers for household and similar general purposes –
Part 2-3: Appliance couplers with a degree of protection higher than IPX0
ISO 354:2003, Acoustics – Measurement of sound absorption in a reverberation room
ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering method in an essentially free field over a reflecting plane
ISO 3767-1:1998, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment – Symbols for operator controls and other displays – Part 1: Common symbols
ISO 3767-3:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment – Symbols for operator controls and other displays – Part 3: Symbols for powered
lawn and garden equipment
ISO 8662-1:1988, Hand-held portable power tools – Measurement of vibrations at the handle
– Part 1: General
ISO 11201:1995, Acoustics – Noise emitted by machinery and equipment – Measurement of
emission sound pressure levels at a work station and at other specified positions –
Engineering method in an essentially free field over a reflecting plane
ISO 12100-1:2003, Safety of machinery – Basic concepts, general principles for design – Part
1: Basic terminology, methodology
ISO 11688-1:1995, Acoustics – Recommended practice for the design of low-noise machinery
and equipment – Part 1: Planning
ISO 11684:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment – Safety signs and hazard pictorials – General principles
3 Definitions
This clause of Part 1 is applicable except as follows.
3.1.9
Replacement:
normal operation
operation of the appliance at rated voltage with the load necessary to attain rated power input
NOTE The trimmer is operated at no-load. Automatic line extenders must be disabled.
3.5.2
Replacement:
hand-held appliance
appliance which is supported by hand, possibly assisted by wheel(s), skids or harness etc.
and constructed such that it cannot maintain its operating position without being held by an
operator
3.101
walk-behind appliance
appliance which is ground supported, controlled by an operator walking behind and
constructed such that it maintains its operating position without being held by an operator
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60335-2-91 © IEC:2008 – 9 –
3.102
lawn trimmer
grass trimming machine where the cutting means operates in a plane approximately parallel
to the ground
3.103
lawn edge trimmer
grass trimming machine where the cutting means operates in a plane approximately
perpendicular to the ground
3.104
cutting means
mechanism used to provide the cutting action in which one or more cutting elements, cutting
by impact, rotate about an axis normal to the cutting plane
3.105
cutting element
single non-metallic filament line or freely pivoting non-metallic cutter
3.106
cutting head
support system for the cutting element
3.107
cutting means control
device activated by the operator’s hand or finger, for controlling the cutting mean’s movement
3.108
power switch
switch that controls the primary operating means of the trimmer
3.109
no-load
operation of the appliance at rated voltage with new cutting means, extendable monofilament
line being trimmed to the maximum cutting length less 5 mm
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be of class ll or class lll.
Compliance is checked by inspection and by the relevant tests.
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6.2 Addition:
Walk-behind trimmers of class II or with class II parts shall be classified at least as IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Add the following new indents:
− manufacturer’s address or country of origin;
− year of manufacture, in 4 digits.
Add the following new paragraphs:
The following warnings shall be located in easily visible positions, indicating:
WARNING:
– Read instruction manual.
– Keep bystanders away.
Except for walk-behind lawn trimmers with 360 degree guarding, the machine shall also be
marked with the following:
– Wear eye protection.
Mains-operated appliances shall also be marked with the substance of the following:
– Disconnect the mains plug if the cord is damaged or entangled.
Additionally, hand-held lawn trimmers and hand-held lawn edge trimmers shall be marked
with the following:
– Do not expose to moisture.
Marking giving cautionary information shall be located as close as practicable to the relevant
hazard. Such marking shall either be in one of the official languages of the country in which
the appliance is to be sold or the safety signs and symbols according to Annex AA shall be
used. Colours shall be in accordance with ISO 3767-1 and ISO 3767-3 and/or ISO 11684 as
appropriate unless the symbols are cast, embossed or stamped when colours are not
required. If symbols and/or safety signs are used, their significance shall be described in the
instruction manual.
7.12 Addition:
An operator’s manual shall be supplied with the machine. This shall include
a) a repeat of those warnings required to be marked on the appliance together with further
explanation, where appropriate. Where symbols or safety signs are used in the marking on
the appliance, their function shall be explained;
b) instructions for the proper assembly of the appliance for use, if the appliance is not
supplied in a completely assembled form;
c) instructions for proper adjustment and maintenance of the appliance;
d) where parts are consumable, the part number of the replacement shall be specified;
e) instructions on the operation of all controls;
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60335-2-91 © IEC:2008 – 11 –
f) advice on th
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