EN 50636-2-91:2014

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

This clause of Part 1 is replaced by the following. This European Standard specifies safety requirements and their verification for the design and construction 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 75 V d.c.. NOTE 101 The method of calculating the kinetic energy for the purposes of this standard is given in 22.103. In this European Standard, hand-held and walk-behind lawn trimmers and lawn edge trimmers are referred to collectively as machine(s). This European Standard does not apply to - scissor type or lawn trimmers and lawn edge trimmers with cutting means other than those described above; - lawn trimmers and lawn edge trimmers with collecting devices; - self-propelled lawn trimmers or lawn edge trimmers; EMC and environmental aspects, except noise, have not been considered in this European Standard. This European Standard does not apply to chargers as covered by EN 60335-2-29. This European Standard does not apply to batteries as covered by EN 62133. This European Standard deals with all the significant hazards presented by hand-held and walk-behind lawn trimmers and lawn edge trimmers when they are used as intended and under conditions of misuse which are reasonably foreseeable.

Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke - Teil 2-91: Besondere Anforderungen für handgeführte Rasentrimmer und Rasenkantenschneider

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

S'applique aux coupe-gazon et coupe-bordures électriques, portatifs et à conducteur à pied, comportant un ou plusieurs organes de coupe constitués d'un filament non-métallique ou d'une lame non métallique à pivotement libre, chacun étant caractérisé par une énergie cinétique infériure ou égale à 10 J, utilisés par un opérateur à pied pour couper l'herbe.

Gospodinjski in podobni električni aparati - Varnost - 2-91. del: Posebne zahteve za ročno vodljive in prenosne motorne kose za trate in robove trat

To točko 1. dela nadomešča naslednje besedilo.
Ta evropski standard določa varnostne zahteve in njihovo preverjanje za načrtovanje ter konstrukcijo električno gnanih, ročno vodljivih in prenosnih motornih kos za trate in robove trat, z rezalnimi deli iz nekovinskih niti ali prosto vrtečih se nekovinskih rezil, pri čemer nobeno nima več kot 10 J kinetične energije, ki jih uporablja stoječ upravljavec za košnjo trave, njihova nazivna napetost pa ne sme presegati 250 V izmeničnega toka ali 75 V enosmernega toka.
OPOMBA 101: Metoda za izračun kinetične energije za namene tega standarda je navedena v 22.103.
V tem evropskem standardu so prenosne in ročno vodljive motorne kose za trate in robove trat
označene s skupnim imenom stroji.
Ta evropski standard se ne uporablja za
– škarje ali motorne kose za trate in robove trat s sredstvi rezanja, ki niso
navedena v zgornjem besedilu;
– motorne kose za trate in robove trat z zbiralnimi napravami;
– samognane motorne kose za trate ali robove trat;
Elektromagnetna združljivost in okoljski vidiki z izjemo hrupa niso obravnavani v tem evropskem standardu.
Ta evropski standard se ne uporablja za polnilnike iz standarda EN 60335-2-29.
Ta evropski standard se ne uporablja za baterije iz standarda EN 62133.
Ta evropski standard obravnava vsa večja tveganja, ki jih predstavljajo prenosne in ročno vodljive
motorne kose za trate in robove trat, kadar se uporabljajo v skladu z njihovim namenom in pod pogoji razumno predvidene nepravilne uporabe.

General Information

• Status: Published
• Publication Date: 19-Jun-2014
• Withdrawal Date: 01-Sep-2016
• ICS: 65.060.70 - Horticultural equipment
• Technical Committee: CLC/TC 116 - Safety of hand-held motor-operated electric tools
• Drafting Committee: CLC/TC 116/WG 05 - Gardening appliances
• Parallel Committee: IEC/SC 61F - IEC_SC_61F --> TC 116
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 20-Jun-2014
• Completion Date: 20-Jun-2014
• 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)
• Directive: 98/37/EC - Machinery
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST EN 50636-2-91:2015 - Household and similar electrical appliances - Safety -- Part 2-91: Particular requirements for walk-behind and hand-held lawn trimmers and lawn edge trimmers

Relations

• Replaces: EN 60335-2-91:2003 - 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: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2015
1DGRPHãþD
SIST EN 60335-2-91:2004
*RVSRGLQMVNLLQSRGREQLHOHNWULþQLDSDUDWL9DUQRVWGHO3RVHEQH]DKWHYH
]DURþQRYRGOMLYHLQSUHQRVQHPRWRUQHNRVH]DWUDWHLQURERYHWUDW
Household and similar electrical appliances - Safety -- Part 2-91: Particular requirements
for walk-behind and hand-held lawn trimmers and lawn edge trimmers
Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke -- Teil 2-91:
Besondere Anforderungen für handgeführte Rasentrimmer und Rasenkantenschneider
Appareils électrodomestiques et analogues - Sécurité -- Partie 2-91: Règles particulières
pour les coupe-gazon et les coupe-bordures portatifs et à conducteur à pied
Ta slovenski standard je istoveten z: EN 50636-2-91:2014
ICS:
13.120 Varnost na domu Domestic safety
65.060.70 Vrtnarska oprema Horticultural equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50636-2-91

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 65.060.70 Supersedes EN 60335-2-91:2003
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

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

This European Standard was approved by CENELEC on 2013-09-02. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50636-2-91:2014 E
Contents Page
Foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and 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 .13
9 Starting of motor-operated appliances .13
10 Power input and current .13
11 Heating .13
12 Void .13
13 Leakage current and electric strength at operating temperature .13
14 Transient overvoltages .13
15 Moisture resistance .14
16 Leakage current and electric strength .14
17 Overload protection of transformers and associated circuits .14
18 Endurance .14
19 Abnormal operation .14
20 Stability and mechanical hazards .14
21 Mechanical strength .17
22 Construction.18
23 Internal wiring .20
24 Components .20
25 Supply connection and external flexible cords .20
26 Terminals for external conductors .21
27 Provision for earthing .21
28 Screws and connections .21
29 Clearances, creepage distances and solid insulation .21
30 Resistance to heat and fire .21
31 Resistance to rusting .21
32 Radiation, toxicity and similar hazards .22
Annexes .27
Annex B (normative) Appliances powered by rechargeable batteries .27

- 3 - EN 50636-2-91:2014
Annex AA (normative) Safety signs and symbols which may be used on lawn trimmers and
lawn edge trimmers .29
Annex BB (normative) Vibration .32
Annex CC (normative) Noise test code – Engineering method (grade 2) .37
Annex DD (informative) Example of a material and construction fulfilling the requirements for
an artificial surface .43
Annex EE (informative) Safety instructions .45
Annex FF (normative) Test enclosure - Base.47
Annex ZZ (informative) Coverage of Essential Requirements of EU Directives .49
Bibliography .50
Figures
Figure 101  Guard, lawn trimmer (see Clause 20.101.1) . 23
Figure 103  Guard strength test (hand-held trimmers) . 25
Figure 104  Cutting head strength test (see Clause 21.102). 25
Figure 105  Cutting means measurement (see Clause 22.103) . 26
Figure AA.1  “Read operator’s manual” . 29
Figure AA.2  “Keep bystanders away” . 29
Figure AA.3  “Wear eye protection” . 30
Figure AA.4  “Do not expose to rain” . 30
Figure AA.5  “Disconnect the mains plug if the cord becomes damaged or entangled” . 30
Figure AA.6  “Wear hearing protection”. 31
Figure BB.1  Examples of transducer location/orientation (hand-held trimmers) . 35
Figure BB.2  Examples of transducer location/orientation (walk-behind machines) . 36
Figure CC.1  Microphone positions on the hemisphere (see Table CC.1) . 38
Figure DD.1  Sketch of the measurement surface covered with an artificial surface (not to
scale) . 44
Figure FF.1  Nail plan of base . 47
Figure FF.2  Base detail. 48
Tables
Table CC.1  Co-ordinates of microphone positions . 39
Table CC.2  Absorption coefficients . 40

Foreword
This document (EN 50636-2-91:2014) has been prepared by CLC/TC 116 "Safety of motor-operated
electric tools".
The following dates are fixed:
• latest date by which this document has to be
(dop) 2014-12-20
implemented
at national level by publication of an identical
national standard or by endorsement
• latest date by which the national standards conflicting
(dow) 2016-09-02
with this document have to be withdrawn
This document supersedes EN 60335-2-91:2003.
EN 60335-2-91:2013 includes the following significant technical changes:
– rewording of some clauses;
– alignment to EN 60335-1:2012;
– improvement of Clause 20.102.
This document is to be used in conjunction with EN 60335-1:2012, “Household and similar electrical
appliances  Safety  Part 1: General requirements”.
When “Part 1” is mentioned in this standard, it refers to EN 60335-1:2012.
This document supplements or modifies the corresponding clauses in Part 1, so as to convert that
publication into the European Standard “Safety requirements for walk-behind and hand-held lawn
trimmers and lawn edge trimmers”.
Where a particular subclause of Part 1 is not mentioned in document, that subclause applies as far as
is relevant. Where this standard states “addition”, “modification” or “replacement”, the relevant text in
Part 1 is to be adapted accordingly.
Compliance with the relevant clauses of Part 1 together with this document provides one means of
conforming to the specified essential health and safety requirements of the Directive.
This European Standard follows the overall requirements of EN ISO 12100.
Warning: Other requirements arising from other EU Directives can be applicable to the products
falling within the scope of this European Standard.
The following numbering system is used:
– subclauses that are numbered starting from 101 are additional to those in Part 1;
– additional annexes are lettered AA, BB, etc.;
NOTE In this European Standard the following print types are used:
- requirements proper: in roman type;
- test specifications: in italic type;
- explanatory matter: in smaller 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.
- 5 - EN 50636-2-91:2014
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC 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 ZZ, which is an integral part of this
document.
Introduction
This document is a type C standard as stated in EN ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and events are
covered is as indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B
standards, the provisions of this type C standard take precedence over the other standards, for
machines which have been built and designed to the provisions of this type C standard.

- 7 - EN 50636-2-91:2014
1 Scope
This clause of Part 1 is replaced by the following.
This European Standard specifies safety requirements and their verification for the design and
construction 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 75 V d.c.
NOTE 101  The method of calculating the kinetic energy for the purposes of this standard is given in 22.103.
In this European Standard, hand-held and walk-behind lawn trimmers and lawn edge trimmers are
referred to collectively as machine(s).
This European Standard does not apply to
− scissor type or lawn trimmers and lawn edge trimmers with cutting means other than those
described above;
− lawn trimmers and lawn edge trimmers with collecting devices;
− self-propelled lawn trimmers or lawn edge trimmers;
EMC and environmental aspects, except noise, have not been considered in this European Standard.
This European Standard does not apply to chargers as covered by EN 60335-2-29.
This European Standard does not apply to batteries as covered by EN 62133.
This European Standard deals with all the significant hazards presented by hand-held and walk-
behind lawn trimmers and lawn edge trimmers when they are used as intended and under
conditions of misuse which are reasonably foreseeable.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
EN 28662-1:1992, Hand-held portable power tools  Measurement of vibrations at the handle 
Part 1: General (ISO 8662-1:1988)
EN 60068-2-75, Environmental testing  Part 2-75: Tests  Test Eh: Hammer tests (IEC 60068-2-
75)
EN 60320 (all parts), Appliance couplers for household and similar general purposes (IEC 60320)
EN 60335-1:2012, Household and similar electrical appliances  Safety  Part 1: General
requirements (IEC 60335-1:2010, modified)
EN 62233:2008, Measurement methods for electromagnetic fields of household appliances and similar
apparatus with regard to human exposure (IEC 62233:2005, modified)
EN ISO 354:2003, Acoustics  Measurement of sound absorption in a reverberation room
(ISO 354:2003)
EN 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 3744:2010)
EN ISO 3767-1:2000, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment  Symbols for operator controls and other displays  Part 1: Common symbols
(ISO 3767-1:1998)
EN ISO 3767-3, 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 3767-3)
EN ISO 4871:2009, Acoustics  Declaration and verification of noise emission values of machinery
and equipment (ISO 4871:1996)
EN 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 11201:2010)
EN ISO 11688-1:2009, Acoustics  Recommended practice for the design of low-noise machinery
and equipment  Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100:2010, Safety of machinery  General principles for design  Risk assessment and
risk reduction (ISO 12100:2010)
ISO 11684:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment  Safety signs and hazard pictorials  General principles
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.9
Replacement:
3.1.9
normal operation
operation of the machine at rated voltage with the load necessary to attain rated power input
3.5.2
Replacement:
3.5.2
hand-held trimmer
machine 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
Addition:
3.101
walk-behind trimmer
machine 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

- 9 - EN 50636-2-91:2014
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 machine
3.109
no-load
operation of the machine at rated voltage with new cutting means, extendable non-metallic filament
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 except as follows:
5.2 Addition
The machine used for the tests of Clause 18 shall not be used for other tests.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Machines shall be of class ll or class lll.

Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Walk-behind trimmers of class II or with class II equipment 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:
− business name and full address of the manufacturer and, where applicable his authorized
representative;
− year of construction;
− designation of the machine,
designation of machine may be achieved by a combination of letters and/or numbers. The
designation may be provided in the form of a code, providing that this code is explained by giving
the explicit designation such as “lawn trimmer”, “lawn edge trimmer” etc. in the instructions
supplied with the machine;
NOTE 1 An example of such code is “A123B”.
− designation of series or type,
allowing the technical identification of the product. This may be achieved by a combination of
letters and/or numbers and may be combined with the designation of machine;
NOTE 2 The term “designation of series or type” is also known as model number.
− mandatory markings;
NOTE 3 For machines and their related products intended to be put on the market in the EEA, CE-marking as defined in
the applicable European Directive(s), e.g. the Machinery Directive.
Add the following new paragraphs:
The following warnings shall be located in easily visible positions, indicating:
WARNING:
- Read instruction manual.
- Keep bystanders away.
- Wear ear protection.
Controls which may give rise to a hazard (e.g. cutting means control in accordance with 22.40) when
operated shall be marked or so placed as to indicate clearly which part of the machine they control.
If the guarding is less than a total of 360°, the direction of rotation of the cutting element(s) shall be
marked on the machine.
Except for walk-behind lawn trimmers with 360 degree guarding, the machine shall also be marked
with the following:
− Wear eye protection.
Mains operated machines shall also be marked with the substance of the following:
− Disconnect the mains plug if the cord becomes damaged or entangled.

- 11 - EN 50636-2-91:2014
Additionally, hand-held lawn trimmers and hand-held lawn edge trimmers shall be marked with the
following:
− Do not expose to rain.
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 machine is to
be sold or the safety signs and symbols according to Annex AA shall be used. Symbols according to
EN ISO 3767-1, EN ISO 3767-3 and/or ISO 11684 may also be used, as appropriate. Colours shall be
in accordance with EN ISO 3767-1 and EN 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.
7.9 This clause of Part 1 is not applicable.
7.12 Replacement:
An instruction manual shall be supplied with the machine, giving operating, servicing, maintenance
and safety instructions that comply as appropriate with EN ISO 12100:2010, 6.4. The words ‘Original
instructions’ shall appear on the language version(s) verified by the manufacturer or his authorised
representative. Where no ‘Original instructions’ exist in the official language(s) of the country where
the machine is to be used, a translation into that/those language(s) shall be provided by the
manufacturer or his authorised representative or by the person bringing the machine into the language
area in question. The translations shall bear the words ‘Translation of the original instructions’, and
they shall be accompanied by a copy of the ‘Original instructions’.
This instruction manual shall include:
a) a repeat of those warnings required to be marked on the machine together with further
explanation, where appropriate. Where safety signs are used in the marking on the machine, their
function shall be explained;
b) a warning to never allow children, persons with reduced physical, sensory or mental capabilities
or lack of experience and knowledge or people unfamiliar with these instructions to use the
machine, local regulations may restrict the age of the operator;
c) a warning to never operate the machine while people, especially children, or pets are nearby;
d) a general description of the machine, the intended use, instructions for the proper use of the
machine including advice on what the machine should be used for, how to use it for the intended
purpose(s) and any reasonably foreseeable misuse thereof;
e) warnings concerning ways - that experience has shown might occur - in which the machinery shall
not be used;
f) instructions for the proper assembly and disassembly of the machine for use, if the machine is not
supplied in a completely assembled form;
g) instructions for proper adjustment and any necessary user maintenance of the machine, including
timescales and a warning of the danger of moving hazardous parts;
h) instructions for the recommended replacement or repair of, or service attention to, critical
components. Where parts are consumable, the part number of the spare part shall be specified;
i) an instruction never to replace the non-metallic cutting means with metallic cutting means;
j) instructions on the operation of all controls;
k) information how to start the machine safely;
l) instructions for the operating position and the correct and safe operation of the machine such as
moving, safe positioning, handling, clearing blockages for use, preparation, maintenance and
storage of the machine;
m) an advice to not overreach and to keep the balance at all times, to always be sure of the footing
on slopes and to walk, never run;
n) a warning not to touch moving hazardous parts before the machine is disconnected from the
mains and the moving hazardous parts have come to a complete stop;

o) an advice on the use, length and type of extension cords to be used (not lighter than required by
25.7);
p) information about the residual risks that remain despite the inherent safe design measures,
safeguarding and complementary protective measures adopted;
q) instructions to always wear substantial footwear and long trousers while operating the machine;
r) instructions to disconnect the supply (e.g. remove the plug from the mains or remove the disabling
device)
1) whenever the machine is left by the user;
2) before clearing a blockage;
3) before checking, cleaning or working on the machine;
4) after striking a foreign object to inspect the machine for damage;
5) if the machine starts to vibrate abnormally, for immediately check;
s) instructions when, where and how to inspect the machine, the supply and extension cord for signs
of damage or ageing and, if permitted, how to make repairs;
t) a warning never to operate the machine with defective guards or shields, or without safety
devices, or if the cord is damaged or worn;
u) an advice not to connect a damaged cord to the supply or touch a damaged cord before it is
disconnected from the supply for the reason that damaged cords can lead to contact with live
parts;
v) an advice to keep extension cords away from moving hazardous parts to avoid damages to the
cords which can lead to contact with live parts;
w) the operating method to be followed in the event of accident or breakdown;
x) instructions how to disconnect the machine from the mains, if the cord becomes damaged or
entangled during use;
y) recommendations
1) to connect the machine only to a supply circuit protected by a residual current device (RCD)
with a tripping current of not more than 30 mA,
2) to avoid using the machine in bad weather conditions especially when there is a risk of
lightning;
z) information about airborne noise emissions of the machine according to Annex CC, this includes:
1) the A- weighted emission sound pressure level emitted by the machinery, where this exceeds
70 dB(A), where this level does not exceed 70 dB(A), this fact shall be indicated.
2) the peak C-weighted instantaneous sound pressure value at machinery, where this exceeds
63 Pa (130 dB in relation to 20 μPa);
3) the A-weighted sound power level emitted by the machinery, if the A-weighted emission sound
pressure level exceeds 80 dB(A);
4) the uncertainties surrounding the determined noise emission values according to Annex CC;
aa) the vibration total value to which the hands are subjected as determined according to Annex BB,
where this exceeds 2,5 m/s²; where this level does not exceed 2,5 m/s², this fact shall be
indicated;
bb) the uncertainty of measurement for vibration value;

- 13 - EN 50636-2-91:2014
cc) instructions how to proceed in case of abnormal vibrations;
dd) mass in kilograms.
NOTE Examples of safety instructions are given Annex EE.
Compliance shall be checked by inspection.
7.12.1 This clause of Part 1 is applicable.
7.12.5 to 7.12.6 These clauses of Part 1 are applicable.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is not applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.4 Not applicable.
11.5 Replacement:
The machine is operated in still air under normal operation until a steady state is reached, the torque
being applied is measured. While the torque is maintained, the voltage is then adjusted to 0,94 times
the rated voltage or 1,06 times the rated voltage, whichever is the most unfavourable.
11.6 Not applicable.
11.7 Replacement:
Machines are operated until steady conditions are established.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is only applicable for class II machines.
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 only applicable for class II machines.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable to battery powered machines. For mains operated machines this
clause of Part 1 is applicable except as follows:
18.101 Machines 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 work loose as a result of heating, vibrations, etc.
Moreover, overload protection devices shall not operate under normal running conditions.
Compliance is checked by the test of Clause 18.102.
Immediately after the test, the machine shall withstand an electric strength test as specified in
Clause 16. Connections shall not have worked loose, and there shall be no deterioration impairing
safety in normal use.
18.102 The machine is operated at no-load for 15 h of operation at a voltage equal to 1,1 times
rated voltage, and then for 15 h at a supply voltage equal to 0,9 times rated voltage. The machine
may be operated for a number of periods, each period being not less than 7 h.
During this test, the machine is maintained according to the instruction manual and replacement of the
carbon brushes is allowed.
During these tests, overload protection devices shall not operate.
19 Abnormal operation
This clause of Part 1 is applicable except as follows:
19.7 Not applicable.
19.9 Not applicable.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows:
20.1 Not applicable.
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20.2 Replacement:
All power driven transmission parts (other than the cutting means) shall be guarded to prevent the
operator's contact with these parts.
The principles set out in EN ISO 12100 shall be followed when developing a guarding system.
All guards shall be either permanently attached, or secured to prevent removal without the use of
tools in accordance with 6.3.3.2.2 of EN ISO 12100, or the construction of the machine shall be such
that it cannot be used without the guard in its guarding position in accordance with 6.3.3.2.3 of
EN ISO 12100.
Fixed guards that the user is instructed to remove for regular maintenance shall have their fixing
means retained on either the guard or the body of the machine.
Compliance is checked by inspection.
20.101 Guarding of cutting means
20.101.1 Lawn trimmers
Lawn trimmers shall be guarded on the operator’s side, as a minimum, to the extent shown in
Figure 101.
The radius X of the guard shall not be smaller than the major swept radius of the cutting head and
the guard shall extend beyond the plane of the cutting element by at least 3 mm for walk-behind
lawn trimmers and 10 mm for hand-held lawn trimmers. The guard shall extend at least 45° from
the axis of the handle on the side where the cutting element is moving away from the operator and at
least 90° from the axis of the handle on the side where the cutting element is moving towards the
operator. The vertices of these angles lie on the axis of the cutting head spindle. If the direction of
rotation is reversed, the 45° and 90° guarding requirements are transposed.
Compliance is checked by inspection and measurement.
20.101.2 Lawn edge trimmers
Lawn edge trimmers shall be guarded, as a minimum, to the extent shown in Figure 102. The radius
X of the guard shall not be smaller than the major swept radius of the cutting head. The guard shall
extend beyond the plane of the cutting element by at least 10 mm. With the lawn edge trimmer in its
normal position of use, the guard shall extend a minimum of 90° from the vertical towards the ground
on the side where the cutting element is moving upwards and a minimum of 45° from the vertical
towards the ground on the side where the cutting element is moving downwards. The vertices of
these angles lie on the axis of the cutting head spindle. If the direction of rotation is reversed, the 45°
and 90° guarding requirements are transposed.
Compliance is checked by inspection and measurement in all normal positions of use.
20.101.3 Guarding of cutting means
The guards shall be imperforate and shall be permanently attached or secured by screws, nuts or
snap fits to prevent removal without the use of tools.
Compliance is checked by inspection.

20.102 Noise
20.102.1 Reduction as a safety requirement
20.102.1.1 Reduction at source by design and protective measures
Noise reduction shall be an integral part of the design process thus specifically taking into account
measures at source. The success of the applied noise reduction measures is assessed on the bases
of the actual noise emission values (see Annex CC) in relation to other machines of the same family. If
required to be declared, the noise test code of Annex CC shall be used for the determination of the
sound power level and of the emission sound pressure level at the operators position. The main
sources causing noise are:
− air intake system;
− cutting system;
− vibrating surfaces.
EN ISO 11688-1:2009 gives general technical information on widely recognized technical rules and
means to be followed in the design of low-noise machines.
20.102.2 Reduction by information
After taking possible technical noise reduction at source, it is still required that, if appropriate, the
instruction manual:
− recommends the use of low-noise operating modes, and/or limited time of operation;
− gives a warning of hazardous noise levels and recommends the use of hearing protection.
20.103 Vibration
20.103.1 Reduction by design and protective measures
The machine shall be designed to generate a vibration level as low as practicable. If required to be
declared, the vibration test code of Annex BB shall be used for the measurement of hand-arm
vibration. The main sources causing vibration are the:
− oscillating forces from the motor;
− cutting means;
− unbalanced moving parts;
− impact in gears, bearings and other mechanisms;
− interaction between operator, machine and material being worked;
− machine design related to mobility;
− travelling surface, speed, tyre pressure.
NOTE CR 1030-1:1995 gives general technical information on widely recognized technical rules and means to be followed in
the design of machines for low hand-arm vibration solutions.
Besides the vibration reduction of the source, technical measures to isolate the vibration source from
the handle may be used, when appropriate, such as isolators and resonating masses.
20.103.2 Reduction by information
After taking possible technical measures for vibration reduction, it is still recommended that, when
appropriate, the instruction manual recommends:

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− the use of low-vibration operating modes, and/or limited time of operation;
− the wearing of personal protection equipment (PPE).
21 Mechanical strength
This clause of Part 1 is applicable except as follows:
21.1 Replace the second paragraph by the following:
The compliance of cutting means guards is checked by the tests of Clause 21.101 and the
compliance of cutting heads are checked by the tests of Clause 21.102. Other parts of the machine
are checked by applying blows to the machine by means of the spring-operated impact test apparatus
described in EN 60068-2-75.
Replace value of impact in the third paragraph with 1,0 J ± 0,05 J.
21.101 Strength and rigidity of cutting means guard
The mechanical strength and rigidity of the cutting means guard shall be adequate for normal use.
Compliance shall be checked by the tests given in Clause 21.101.1, 21.101.2 and 21.101.3.
21.101.1 The rigidity of the cutting means guard is checked by applying a force, at any point,
equivalent to the weight of the machine in the most unfavourable direction for 30 s.
During the test, the guard shall not have become detached, nor shall it show any visible cracks. After
the test the guard shall not have distorted permanently. The screws and retaining clips shall still be
secure and the requirements of Clause 21.101.1 and 21.101.2 shall still be met.
21.101.2 The strength of cutting means guards of walk-behind lawn trimmers and walk-behind
lawn edge trimmers is tested by means of a ball impact test.
Each of three samples of the complete machine is subjected to an impact of 6,5 J ± 0,2 J on a part of
the guard likely to be the weakest, with the machine resting on a smooth, rigid, level surface.
The tests are conducted so that, in each test, the sample receives an impact in a location different
from the other two tests.
The impact is produced with a smooth steel sphere (as used for ball bearings) having a diameter of
50 mm ± 0,8 mm. If the part to be tested is at an angle of up to 45° to the horizontal, the sphere is
allowed to fall vertically from rest to strike the part. Otherwise, the sphere is suspended by a cord and
is allowed to fall from rest as a pendulum to strike the part. In either case, the vertical travel of the
sphere is to be 1 300 mm ± 3 mm.
After the tests, the guard shall not have become detached nor shall it show any visible cracks. The
screws and retaining clips shall still be secure and the requirements of Clause 20.101.1 and 20.101.2
shall still be met.
21.101.3 The strength of the cutting means guards of hand-held lawn trimmers and hand-held
lawn edge trimmers is tested by means of the following drop test.
One sample of the complete machine without the supply cord is dropped three times so that the
guard falls through a vertical distance of 900 mm ± 2 mm onto a smooth horizontal concrete surface in
such a manner as to test the guard most severely. A string shall be used to suspend the machine so

that the desired orientation of the machine is achieved. Cutting the string will allow the machine to fall
in the correct orientation to test the guard of the cutting head (see Figure 103).
After the tests, the guard shall not have become detached nor shall it show any visible cracks. The
screws and retaining clips shall still be secure and the requirements of Clause 20.101.1 and 20.101.2
shall still be met.
21.102 Strength of the cutting head
The mechanical strength of the cutting head shall be adequate for normal use. Before the test, the
temperature of the parts to be tested shall be stabilized to an ambient temperature of 20 °C ± 3 °C.
Compliance shall be checked by the test given below.
One sample of the complete machine is dropped so that the cutting head, in a horizontal plane, falls
through a vertical distance to make contact with a rigidly supported horizontal steel block. The drop
height is 900 mm ± 2 mm for hand-held lawn trimmers and hand-held lawn edge trimmers, and
250 mm ± 2 mm for walk-behind lawn trimmers and walk-behind lawn edge trimmers. A string
shall be used to suspend the machine so that the desired orientation of the machine is achieved.
Cutting the string will allow the machine to fall in the correct orientation to test the cutting head (see
Figure 104).
Damage to other parts during this test shall be ignored.
It is not necessary for the machine to be operable after the test.
If the machine is operable, then, immediately following the test, the machine shall be run at its
maximum speed for 30 s both with and without cutting elements.
If the machine is not operable and the cutting head is not visibly damaged, all parts of the cutting
head that are replaceable by the user and which can be
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