SIST EN 60335-2-91:2004

SLOVENSKI SIST EN 60335-2-91:2004

STANDARD
marec 2004
Gospodinjski in podobni električni aparati - Varnost - 2-91. del: Posebne
zahteve za ročno vodljive in prenosne motorne kose za trate in robove trat
(IEC 60335-2-91:2002; spremenjen)
Household and similar electrical appliances - Safety - Part 2-91: Particular
requirements for walk-behind and hand-held lawn trimmers and lawn edge trimmers
ICS 65.060.70 Referenčna številka
SIST EN 60335-2-91:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 60335-2-91
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2003

ICS 65.060.70


English version


Household and similar electrical appliances -
Safety
Part 2-91: Particular requirements for walk-behind
and hand-held lawn trimmers and lawn edge trimmers
(IEC 60335-2-91:2002, modified)


Appareils électrodomestiques  Sicherheit elektrischer Geräte für den
et analogues - Hausgebrauch und ähnliche Zwecke
Sécurité Teil 2-91: Besondere Anforderungen
Partie 2-91: Règles particulières pour les für handgeführte Rasentrimmer
coupe-gazon et les coupe-bordures und Rasenkantenschneider
portatifs et à conducteur à pied (IEC 60335-2-91:2002, modifiziert)
(CEI 60335-2-91:2002, modifiée)




This European Standard was approved by CENELEC on 2003-02-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60335-2-91:2003 E

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EN 60335-2-91:2003 - 2 -
Foreword
The text of the International Standard IEC 60335-2-91, prepared by SC 61F, Safety of hand-held motor-
operated electric tools, of IEC TC 61, Safety of household and similar electric appliances, together with
common modifications prepared by the Technical Committee CENELEC TC 61F, Safety of hand-held and
transportable motor-operated electric tools, was submitted to the formal vote and was approved by
CENELEC as EN 60335-2-91 on 2003-02-01.

The following dates were fixed:

– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-02-01

In this standard the common modifications to the International Standard are indicated by a vertical line in
the left margin.

This standard has to be used in conjunction with EN 60335-1, Safety of household and similar electrical
appliances, Part 1: General requirements. It was established on the basis of the 2002 edition of that
standard.

This part 2 supplements or modifies the corresponding clauses of EN 60335-1, so as to convert it into the
European 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 of
Part 1 is to be adapted accordingly.

This European Standard has been prepared under a mandate given to CEN and CENELEC by the
European Commission and the European Free Trade Association and supports the essential health and
safety requirements of the Machinery Directive.

Compliance with the clauses of EN 60335-1 together with this part 2 provides one means of conforming
with the essential health and safety requirements of the Directive.

Other harmonised standards referred to in this European Standard are listed in Annex ZC of Part 1 and
this part. The annex lists the valid edition of those documents at the time of issue of this EN. All
references are however to be understood as references to the latest edition.

NOTE 1 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.;
- subclauses, notes and annexes that are additional to those in the IEC standard are prefixed with the letter Z.
NOTE 2 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.

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- 3 - EN 60335-2-91:2003
Contents
1 Scope.4
2 Normative references.4
3 Definitions.4
4 General requirement .5
5 General conditions for tests .5
6 Classification.5
7 Marking and instructions .5
8 Protection against accessibility to live parts.6
9 Starting.6
10 Power input and current .6
11 Heating.6
12 Void.6
13 Leakage current and electric strength at operating temperature .7
14 Transient overvoltages.7
15 Moisture resistance.7
16 Leakage current and electric strength.7
17 Overload protection of transformers and associated circuits.7
18 Endurance.7
19 Abnormal operation.7
20 Stability and mechanical hazards.8
21 Mechanical strength .8
22 Construction.8
23 Internal wiring.8
24 Components.8
25 Supply connection and external flexible cords.8
26 Terminals for external conductors.8
27 Provision for earthing .9
28 Screws and connections .9
29 Creepage distances, clearances and distances through insulation.9
30 Resistance to heat, fire and tracking.9
31 Resistance to rusting.9
32 Radiation, toxicity and similar hazards.9
Annex BB (normative) Pictograms for lawn trimmers and lawn edge trimmers marking.10
Annex ZC (normative) Normative references to international publications with their corresponding
European publications .11
Bibliography.11

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EN 60335-2-91:2003 - 4 -
1 Scope

This clause of Part 1 is applicable, except as follows:

1 Scope

This clause of Part 1 is replaced by the following:

This standard applies to mains operated 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 ten (10) joules each, used by a standing operator primarily for
cutting grass.

As far as is practicable, this standard deals with the common hazards presented by appliances that are
encountered by all persons in and around the home. However, in general, it does not take into account

– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.

This standard does not apply to scissors type or rigid blade lawn trimmers and lawn edge trimmers.

NOTE In this standard hand-held and walk-behind lawn trimmers and lawn edge trimmers are referred to collectively as
appliances.


2 Normative references

This clause of Part 1 is applicable except as follows:

Addition:

EN 786, Electrically powered walk-behind and hand-held lawn trimmers and lawn edge trimmers –
Mechanical safety


3 Definitions

This clause of Part 1 is applicable except as follows:

3.1.9 Replacement:

normal operation
the load necessary to obtain rated input while the appliance is operated at rated voltage

3.101
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

3.102
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

3.103
lawn trimmer
grass trimming machine where the cutting means operates in a plane approximately parallel to the
ground

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- 5 - EN 60335-2-91:2003
3.104
lawn edge trimmer
grass trimming machine where the cutting means operates in a plane approximately perpendicular to the
ground

3.105
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

3.106
cutting element
single non-metallic filament line or freely pivoting non-metallic cutter



4 General requirement

This clause of Part 1 is applicable.


5 General conditions for 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 II or class III.

Compliance is checked by inspection and by the relevant tests.

6.2 Addition:

Walk-behind appliances of class II or with class II parts shall be classified as IPX4.


7 Marking and instructions

This clause of Part 1 is applicable except as follows:

7.3 Addition:

Lawn trimmers and lawn edge trimmers shall meet all the relevant requirements of EN 786.

Hand-held appliances of class II or with class II parts (unless constructed according to IPX4 or better)
shall also be marked with:

DO NOT EXPOSE TO MOISTURE

If a pictogram is used it shall be that shown in Annex BB. It shall be in contrasting colours to the base
material. If it is embossed, stamped or cast colours are not required.

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EN 60335-2-91:2003 - 6 -
7.12 Replacement:

An instruction sheet shall be supplied with the appliance.

These instructions shall include
a) all the relevant requirements of EN 786;
b) a repeat of all the symbols used on the appliance and an explanation of their meaning;
c) at least the sense of and in proper order the following safety instructions which are to be followed in
the preparation for use, operation and maintenance of the appliance:
– Read the instructions carefully,
– Be familiar with the controls and proper use of the equipment;
– Before use check the supply and extension cord for signs of damage or ageing,
– If the cord becomes damaged during use, disconnect the cord from the supply immediately. DO
NOT TOUCH THE CORD BEFORE DISCONNECTING THE SUPPLY,
– Do not use the lawn trimmer (edge trimmer), if the cords are damaged or worn,
d) the following warnings:
– Warning. Cutting elements continue to rotate after the motor is switched off,
– Keep extension cords away from cutting elements;
e) instructions for the safe operation of the machine, including a recommendation that appliances
should be supplied via a residual current device (RCD) with a tripping current of not more than
30 mA.


8 Protection against accessibility to live parts

This clause of Part 1 is applicable.


9 Starting

This clause of Part 1 is not applicable.


10 Power input and current

This clause of Part 1 is applicable except as follows:

10.1 Not applicable.


11 Heating

This clause of Part 1 is applicable, except as follows:

11.4 Not applicable.

11.6 Not applicable.

11.7 Replacement:

Appliances are operated until steady conditions are established.


12 Void

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- 7 - EN 60335-2-91:2003
13 Leakage current and electric strength at operating temperature

This clause of Part 1 is applicable.


14 Transient overvoltages

This clause of Part 1 is applicable.


15 Moisture resistance

This clause of Part 1 is applicable.


16 Leakage current and electric strength

This clause of Part 1 is applicable except as follows:

16.2 Not applicable.


17 Overload protection of transformers and associated circuits

This clause of Part 1 is applicable.


18 Endurance

18.Z101 Appliances shall be so constructed that, in normal use, there will be no electrical or
mechanical failure that might impair compliance with this standard. The insulation shall not be damaged
and contacts and connections shall not have worked loose as a result of heating, vibration, etc.

Moreover, overload protective devices shall not operate under normal running conditions.

Compliance is checked by the tests of 18.Z102.

18.Z102 The appliance is operated at no-load and at a voltage equal to 1,1 times rated voltage for a
time of 15 h, reduced by the running time necessary for the tests of Clause 11 and Clause 13.

The appliance is then operated at a voltage equal to 0,9 times rated voltage for 15 h. The appliance shall
be fitted with the maximum size/length of cutting means specified by the user instructions.

Appliances are operated continuously, or for a corresponding number of periods, each period being not
less than 7 h.

During the test replacement of carbon brushes is allowed.

18.Z103 During the tests of 18.Z102 overload protective devices shall not operate.

After the tests of 18.Z102 the appliance shall withstand the tests of Clause 16. Connections, handles,
guards, brush-caps and other fittings or components shall not have worked loose, and there shall be no
deterioration impairing safety in normal use.


19 Abnormal operation

This clause of Part 1 is applicable except as follows:

19.7 Not applicable.

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EN 60335-2-91:2003 - 8 -
20 Stability and mechanical hazards

This clause of Part 1 is applicable except as follows:

20.2 Replacement:

Lawn trimmers and lawn edge trimmers shall meet all the relevant requirements of EN 786.



21 Mechanical strength

This clause of Part 1 is applicable except as follows:

21.Z101 Lawn trimmers and lawn edge trimmers shall meet all the relevant requirements of EN 786.


22 Construction

This clause of Part 1 is applicable except as follows:

22.Z101 Lawn trimmers and lawn edge trimmers shall meet all the relevant requirements of EN 786.


23 Internal wiring

This clause of Part 1 is applicable.


24 Components

This clause of Part 1 is applicable except as follows:

24.1 Addition:

Switches shall be tested for at least 10 000 operations.


25 Supply connection and external flexible cords

This clause of Part 1 is applicable except as follows:

25.1 Addition:

Appliance inlets shall not allow the introduction of a connector complying with the standard sheets of
EN 60320, except EN 60320-2-3.

25.7 Replace the first paragraph by the following:

Supply cords shall not be lighter than:
- if rubber insulated, ordinary tough rubber sheathed flexible cord (code designation H05 RR-F) or
ordinary polychloroprene sheathed flexible cord (code designation H05 RN-F);

- if polyvinyl chloride insulated, ordinary polyvinyl sheathed flexible cord (code designation H05 VV-F).


26 Terminals for external conductors

This clause of Part 1 is applicable.

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- 9 - EN 60335-2-91:2003
27 Provision for earthing

This clause of Part 1 is applicable.


28 Screws and connections

This clause of Part 1 is applicable.


29 Creepage distances, clearances and distances through insulation

This clause of Part 1 is applicable.


30 Resistance to heat, fire and tracking

This clause of Part 1 is applicable.


31 Resistance to rusting

This clause of Part 1 is applicable.


32 Radiation, toxicity and similar hazards

This clause of Part 1 is applicable.

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EN 60335-2-91:2003 - 10 -
Annexes

The annexes of Part 1 are applicable except as follows:

Annex B

Appliances powered by rechargeable batteries

This annex of Part 1 is not applicable.


Annex D

Alternative requirements for protected motor

This annex of Part 1 is not applicable.


Annex I

Motors having basic insulation that is inadequate
for the rated voltage of the appliance

This annex of Part 1 is not applicable.


(Annex AA - deleted)


Annex BB
(normative)

Pictograms for lawn trimmers and lawn edge trimmers marking


Do not expose to moisture

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Annex ZC
(normative)

Normative references to international publications
with their corresponding European publications
Addition:
Publication Year Title EN/HD Year
1)
– – Electrically powered walk-behind and hand- EN 786 –
held lawn trimmers and lawn edge trimmers –
Mechanical safety


Bibliography
The bibliography of Part 1 is applicable.


1)
Undated reference.

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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

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– 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

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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

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– 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 standard
...