SIST EN ISO 11806:2009
(Main)Agricultural and forestry machinery - Portable hand-held combustion engine driven brush cutters and grass trimmers - Safety (ISO 11806:1997)
Agricultural and forestry machinery - Portable hand-held combustion engine driven brush cutters and grass trimmers - Safety (ISO 11806:1997)
Specifies safety requirements and their verification for design and construction of portable hand-held, combustion engine driven brush cutters and grass trimmers. This standard is not applicable to backpack powered units, to lawn edge trimmers or to brush cutters equipped with metallic blades consisting of more than one part. It describes methods for the elimination or reduction of risks arising from their use. In addition it specifies the type of information on safe working practices to be provided by the manufacturer. It does not however give any technical requirement to reduce noise and vibration hazards. Indeed the different means available to reduce these risks are a matter for the technical information to which the manufacturer may resort, through specialised books or specific bodies.
Land- und Forstmaschinen - Tragbare handgeführte Freischneider und Trimmer mit Antrieb durch Verbrennungsmotor - Sicherheit (ISO 11806:1997)
Diese Europäische Norm legt sicherheitstechnische Anforderungen und deren Prüfung für Gestaltung und Konstruktion von tragbaren handgeführten Freischneidern/Motorsensen und Trimmern mit Antrieb durch Verbrennungsmotor fest.
Diese Norm gilt nicht für rückentragbare Antriebseinheiten, Rasenkantentrimmer oder Freischneider/Motor-sensen, die mit mehrteiligen, metallischen Schneidwerkzeugen ausgerüstet sind.
Sie beschreibt Maßnahmen zur Vermeidung oder Verminderung der sich aus dem Gebrauch ergebenden Risiken. Außerdem gibt sie Informationen über sicheres Arbeiten, die vom Hersteller zur Verfügung zu stellen sind. Sie beschreibt jedoch keine technischen Maßnahmen zur Minderung der Gefährdung durch Geräusch und Vibration. Die verschiedenen Maßnahmen zur Minderung dieser Risiken sind vielmehr Thema von technischen Informationen aus der Fachliteratur oder von Fachgremien, die der Hersteller anwenden kann.
Die Liste der signifikanten Gefährdungen ist in Anhang A aufgeführt. Anhang A weist auch auf Gefährdungen hin, die nicht behandelt wurden.
Die Gefährdung der Umwelt wird in dieser Norm nicht in Betracht gezogen.
Diese Europäische Norm gilt in erster Linie für Maschinen, die nach dem Ausgabedatum der Norm hergestellt werden.
Matériel agricole et forestier - Débroussailleuses et coupe-herbe portatifs à moteur thermique - Sécurité (ISO 11806:1997)
La présente norme internationale détermine les prescriptions de sécurité et les vérifications pour la conception et la construction des débroussailleuses et des coupe-herbe portatifs à moteur thermique. Cette norme ne s'applique pas aux machines à moteur porté à dos, aux coupe-bordures, ni aux débroussailleuses équipées de lames métalliques faites de plusieurs pièces. Elle décrit les méthodes pour éliminer ou réduire les risques inhérents à leur utilisation. En outre, elle spécifie le type d'informations que le fabricant doit donner sur les pratiques d'utilisation sûre. Elle ne prescrit cependant pas de mesures techniques permettant de réduire les risques liés au bruit et aux vibrations. En effet, le choix des moyens pour réduire ces risques relève d'informations techniques auxquelles le concepteur peut faire appel, par le biais d'ouvrages spécialisés ou d'organismes spécifiques. La liste des phénomènes dangereux significatifs traités dans cette norme est donnée en annexe A. L'annexe A indique également les phénomènes dangereux qui n'ont pas été traités. Les aspects liés à l'environnement n'ont pas été pris en compte dans cette norme. La présente norme internationale s'applique avant tout aux machines fabriquées après la date de publication de la norme.
Kmetijski in gozdarski stroji - Prenosne motorne žage za nego in motorne kose - Varnost (ISO 11806:1997)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11806:2009
01-maj-2009
1DGRPHãþD
SIST EN ISO 11806:1998
SIST EN ISO 11806:1998/AC:1999
Kmetijski in gozdarski stroji - Prenosne motorne žage za nego in motorne kose -
Varnost (ISO 11806:1997)
Agricultural and forestry machinery - Portable hand-held combustion engine driven brush
cutters and grass trimmers - Safety (ISO 11806:1997)
Land- und Forstmaschinen - Tragbare handgeführte Freischneider und Trimmer mit
Antrieb durch Verbrennungsmotor - Sicherheit (ISO 11806:1997)
Matériel agricole et forestier - Débroussailleuses et coupe-herbe portatifs à moteur
thermique - Sécurité (ISO 11806:1997)
Ta slovenski standard je istoveten z: EN ISO 11806:2008
ICS:
65.060.80 Gozdarska oprema Forestry equipment
SIST EN ISO 11806:2009 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11806:2009
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SIST EN ISO 11806:2009
EUROPEAN STANDARD
EN ISO 11806
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 65.060.80 Supersedes EN ISO 11806:1997
English Version
Agricultural and forestry machinery - Portable hand-held
combustion engine driven brush cutters and grass trimmers -
Safety (ISO 11806:1997)
Matériel agricole et forestier - Débroussailleuses et coupe-
herbe portatifs à moteur thermique - Sécurité (ISO
11806:1997)
This European Standard was approved by CEN on 15 October 2008.
CEN 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 Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11806:2008: E
worldwide for CEN national Members.
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SIST EN ISO 11806:2009
EN ISO 11806:2008 (E)
Contents Page
Foreword.3
Annex ZA (Informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC .4
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .5
2
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SIST EN ISO 11806:2009
EN ISO 11806:2008 (E)
Foreword
The text of ISO 11806:1997 has been prepared by Technical Committee ISO/TC TC 23 “Tractors and
machinery for agriculture and forestry” of the International Organization for Standardization (ISO) and has
been taken over as EN ISO 11806:2008 by Technical Committee CEN/TC 144 “Tractors and machinery for
agriculture and forestry” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the
latest by December 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11806:1997.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directives.
For relationship with EC Directives, see informative Annexes ZA and ZB, which are integral parts of this
document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 11806:1997 has been approved by CEN as a EN ISO 11806:2008 without any modification.
3
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SIST EN ISO 11806:2009
EN ISO 11806:2008 (E)
Annex ZA
(Informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association to provide a means of conforming to Essential Requirements of the New
Approach Directive 98/37/EC on machinery, amended by the New Approach Directive 98/79/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements except Essential Requirements 1.2.7, 1.3.2 and 1.3.3 related to
ejected machine parts, 1.5.8, 1.5.9 and 1.7.4 f), of that Directive and associated EFTA regulations.
WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling within the
scope of this standard.
4
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SIST EN ISO 11806:2009
EN ISO 11806:2008 (E)
Annex ZB
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association to provide a means of conforming to Essential Requirements of the New
Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements except Essential Requirements 1.2.1 fourth indent and second
paragraph, third indent, 1.3.2 and 1.3.3 related to machine parts, 1.5.8, 1.5.9, 1.7.3 first paragraph, first and
second indents, 1.7.4.2 q), t) and u) fourth paragraph second indent and 2.2.1.1 first paragraph second indent
of that Directive and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.
5
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SIST EN ISO 11806:2009
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SIST EN ISO 11806:2009
IS0
INTERNATIONAL
11806
TANDARD
First edition
1997-06-l 5
Agricultural and forestry machinery -
Portable hand-held combustion engine
driven brush cutters and grass trimmers -
Safety
D4broussailleuses et coupe-herbe portatifs
Matkiel agricole et forestier -
a moteur thermique - S6curit6
Reference number
IS0 11806:1997(E)
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SIST EN ISO 11806:2009
IS0 11806:1997(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 11806 was prepared by the European
Committee for Standardization (CEN) in collaboration with IS0 Technical
Committee TC 23, Tractors and machinery for agriculture and forestry,
Subcommittee SC 17, Manually portable forest machinery, in accordance
with the Agreement on technical cooperation between IS0 and CEN
(Vienna Agreement).
Annexes A, B, C and D form an integral part of this International Standard.
Annexes ZA and ZZ are for information only.
Annex ZZ provides a list of corresponding International and European
Standards for which equivalents are not given in the text.
0 IS0 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @ iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
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SIST EN ISO 11806:2009
IS0 11806: 1997(E)
@ IS0
Contents
iv
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .=D======D=========~=====B==D.
iv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .=~=======B=9==.~.
0 Introduction
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~.=.
1 Scope
1
. . . . . . . . . . . . . . . . . . . . . . . . . . .==~===========.
2 Normative References
2
. . . . . .~.*.==9====~DB9~=======~~~=====~==.~.~.~.
3 Definitions
5
4 Safety requirements .
5
4.1 General .
5
...........................................................................................................................
4.2 Vibration
6
.................................................................................................................
4.3 Noise emission
7
...............................................................................................................
4.4 Exhaust system
7
............................................................................................................................
4.5 Handles
7
..............................................................................................................................
4.6 Barrier
7
4.7 Throttle control .
8
4.8 Clutch .
8
...................................................................................................
4.9 Engine stopping device
8
...........................................................................................................................
4.10 Harness
9
..........................................................................................................................
4.11 Balance
9
..........................................................................................
4.12 Cutting attachment strength
9
...................................................................................
4.13 Retention of cutting attachment
10
......................................................................................
4.14 Guards for cutting attachment
10
...................................................................................
4.15 Distance to cutting attachment
10
.........................................................................................................................
4 16 Fuel tank
11
....................................................................
4.17 Protection against contact with hot parts
11
...............................................................................................................
4.18 Starting device
11
..........................................
4.19 Protection against contact with parts under high voltage
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
5 Verification of safety requirements
13
.............................................................................................................
6 Information for use
13
6.1 General .
13
................................................................................................................
6.2 Technical data
14
.....................................................................................................
6.3 Instruction handbook
15
6.4 Marking .
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~.
Annex A (normative) List of hazards
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~. 21
Annex B (normative) Cutting attachment impact test
. . . . . . . . . . . . . . . . . . . . . . . . . .~.~. 22
Annex C (normative) Thrown objects test
Clauses of this Standard addressing essential requirements
Annex ZA (informative)
28
. . . . . . . . . .~.~.~.~.
or other provisions of EU Directives
. . .
III
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SIST EN ISO 11806:2009
@ IS0
IS0 11806:1997(E)
Foreword
The text of EN IS0 11806: 1997 has been prepared by Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry ‘0 the secretariat of which is held by AFNOR, in collaboration
with Technical Committee ISO/TC 23 “Tractors and machinery for agriculture and forestry”.
This Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by December 1997, and conflicting national standards shall be withdrawn at
the latest by December 1997.
This Standard has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
The annex A is normative and contains the “List of hazards”.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.
0 Introduction
The extent to which hazards are covered is indicated in the scope of this standard. In addition, machinery shall
comply as appropriate with EN 292 for hazards which are not covered by this standard.
This Standard covers brush cutters as well as grass trimmers, because the design of both machines is basically
identical. Frequently one and the same unit can be either a brush cutter or a grass trimmer, depending on what type
of cutting attachment is used. As grass trimmers are often used in forestry, the relevant requirements have been
included in this standard.
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SIST EN ISO 11806:2009
IS0 11806:1997(E)
@ IS0
1 Scope
This Standard specifies safety requirements and their verification for design and construction of portable
hand-held, combustion engine driven brush cutters and grass trimmers.
This standard is not applicable to backpack powered units, to lawn edge trimmers or to brush cutters equipped
with metalic blades consisting of more than one part.
It describes methods for the elimination or reduction of risks arising from their use. In addition it specifies the
type of information on safe working practices to be provided by the manufacturer. It does not however give any
technical requirement to reduce noise and vibration hazards. Indeed the different means available to reduce these
risks are a matter for the technical information to which the manufacturer may resort, through specialised books
or specific bodies.
The list of significant hazards dealt with is given in Annex A. Annex A also indicates the hazards which have not
been dealt with.
Environmental aspects have not been considered in this standard.
This Standard applies primarily to machines which are manufactured after the date of issue of the standard.
2 Normative References
This Standard incorporates by dated or undated references, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
to this Standard only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to apply.
EN 292-l 199 1 Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology, methodology
EN 292-2 199 1 Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
292-2: 199 l/A 1: 1995 principles and specifications
EN
EN 563 1994 Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to
establish temperature limit values for hot surfaces
EN 27917 199 1 Acoustics - Measurement at the operator’s position of airborne noise emitted by brush
saws
IS0 7112 1982 Machinery for forestry - Portable brush saws - Vocabulary
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SIST EN ISO 11806:2009
@ IS0
IS0 11806: 1997(E)
IS0 7113 1 Forestry machinery - Portable brush saws - Saw blades
IS0 7916 989 Forestry machinery - Portable brush saws - Measurement of hand-transmitted vibration
995 Forestry machinery - Portable brush cutters and grass trimmers - Cutting attachment
IS0 7918
guard dimensions
Forestry machinery - Portable brush cutters and grass trimmers - Cutting attachment
IS0 8380 1993
guard strength
IS0 8893 1989 Forestry machinery - Portable brush-saws - Engine performance and fuel consumption
Manually portable brush cutters and grass trimmers with internal combustion engine -
IS0 10884 1995
Determination of sound power levels - Engineering method (Grade 2)
3 Definitions
For the purposes of this Standard, the following definitions and figures 1 and 2 apply :
3.1 brush cutter
Unit fitted with a rotating blade made of metal or plastic intended to cut weed, brush, small trees and similar
vegetation.
1 engine stopping device
2 throttle trigger lockout
3 suspension point
4 handle
5 throttle trigger
6 shaft tube
7 harness - quick release mechanism
8 harness - hip pad
9 cutting attachment guard
10 blade
11 silencer
Figure 1 : Brush cutter
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SIST EN ISO 11806:2009
IS0 11806:1997(E)
@ IS0
3.2 brush saw
Brush cutter fitted with a circular saw blade.
3.3 grass trimmer
Unit fitted with flexible line(s), string(s), or similar non-metallic flexible cutting elements, such as pivoting
cutters, intended to be used to cut weed, grass or similar soft vegetation.
1 choke
2 handle
3 engine stopping device
4 throttle trigger
5 barrier
6 shaft tube
7 cutting attachment guard
8 silencer
Figure 2: Grass trimmer
3.4 lawn edge trimmer
Grass trimming machine where the cutting means operate in a plane approximately perpendicular to the ground.
3.5 backpack power unit
Power source designed to be mounted on the operator’s back by means of a support frame.
3.6 barrier
Device attached to the unit, to ensure that the operator maintains a minimum distance from the cutting attachment
when the unit is being operated.
3
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SIST EN ISO 11806:2009
@ IS0
IS011806:1997(E)
3.7 blade
Rotating device with cutting edges, made of rigid material.
3.8 saw blade
Circular metal blade with peripheral cutting teeth.
3.9 blade retainer
Mechanism which holds the brush cutter blade to the driving member.
3.10 cutting attachment
Cutting device such as a blade with its retainer, a cutting head etc.
3.11 dry mass
Total unit mass without fuel, cutting attachment and guard.
3.12 cutting attachment guard
Device for the purpose of protecting the operator from unintentional contact with the cutting attachment and from
thrown objects.
3.13 transport guard
Device covering the cutting edges of the blade while the machine is transported or stored in an non operational
mode.
3.14 handle
Device fitted to the unit to enable the operator to hold and manoeuvre the unit.
3.15 harness
Adjustable strap(s) used to suspend the unit from the operator.
3.16 hip pad
Strap or pad of flexible material attached either to the unit or the harness to cushion the operator from impacts
from the unit and to reduce transmission of vibration.
3.17 power transmission shaft
Shaft inside the shaft tube for transmitting the power from the engine to the cutting attachment.
3.18 shaft tube
Part of the unit that provides a casing for the power transmission shaft.
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SIST EN ISO 11806:2009
IS0 11806:1997(E)
@ IS0
3.19 silencer
Device for reducing engine exhaust noise and directing the exhaust gases.
3.20 engine stopping device
Control fitted to the unit which electrically stops the engine.
3.21 suspension point
Device on the unit to which the harness can be attached.
3.22 throttle trigger, throttle control
Device, usually a lever, activated by the operator’s hand or finger, for controlling the engine speed.
3.23 throttle lock
Device for temporarily setting the throttle in a partially open position, to aid starting.
3.24 throttle trigger lockout
Device that prevents unintentional activation of the throttle trigger until manually released.
3.25 unit
Complete brush cutter (or grass trimmer) including power head, power transmission shaft, cutting attachment and
guard, but excluding the harness.
I
4 Safety requirements
41 .
General
Each brush cutter or grass trimmer shall conform with the requirements below. If a grass trimmer can be
converted to a brush cutter then the converted unit shall comply with requirements for a brush cutter and vice
versa.
42 . Vibration
4.2. I General
attachments
The weighted acceleration sum shall be measured according to 42.2 and 4.2.3 and with all cuttin
F
m/s for machines
recommended by the manufacturer. Th3 achievable values at2zach handle is normally below 15
with an en ine displacement of 35 cm or less and 7,5 m/s for machines with an engine displacement of more
5
than 35 cm (see table 1).
5
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SIST EN ISO 11806:2009
IS0 11806: 1997(E) @ IS0
Table 1 : Achievable vibration values
,
Engine displacement
>35cm3
I35 cm3
15 m/s2 7,5 m/s2
I ,
These achievable values do not constitute personal exposure limits, but the emission values from a machine under
defined test conditions (for example speed, load, material to be used . .) and according to the measurement method
of the corresponding vibration levels.
NOTE: The achievable vibration values given in table 1 are not a barrier to innovation, and they should
not prevent the achievement of better values. With this in view, they will have to be revised when the
state of the art evolves.
4.2.2 Brush cutter
The weighted acceleration sum shall be measured in the idling and racing modes in accordance with IS0 79 16.
4.2.3 Grass trimmer
The weighted acceleration sum shall be measured at idling and with wide open throttle and maximum length in
case of flexible line with the guard in place. Other measuring conditions shall be in accordance with IS0 79 16.
43 . Noise emission
Soun d pressu re level
4.3.1
4.3.1.1 General
The sound pressure level shall be measured in accordance with 4.3.1.2 and 4.3.1.3 at the operator’s ear.
Table 2 : Achievable sound pressure values
Engine displacement
>35cm3
I35 cm3
102 dB(A) 105 dB(A)
These achievable values do not constitute personal exposure limits, but the emission values from a machine under
defined test conditions (for example speed, load, material to be used . .) and according to the measurement method
of the corresponding noise levels.
NOTE : The achievable sound pressure values given in table 2 are not a barrier to innovation, and
they should not prevent the achievement of better values. With this in view, they will have to be
revised when the state of the art evolves.
4.3.1.2 Brush cutter
The sound pressure level shall be measured at idling and racing in accordance with EN 279 17.
4.3.1.3 Grass trimmer
The sound pressure level shall be measured at idling and with wide open throttle and maximum length in case of
flexible line with the guard in place. Other measuring conditions shall be in accordance with EN 27917.
6
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SIST EN ISO 11806:2009
@ IS0 IS0 11806:1997(E)
4.3.2 Sound power level
The sound power level shall be measured in accordance with IS0 10884 with all cutting attachments
recommended bv the manufacturer and at the same operating conditions as given in 4.3-l.
44 . Exhaust system
The exhaust outlet shall be
so located as to direct exhaust emissions away from the operator in normal operating
position indicated in figure D3 . .
45 . Handles
4.5.1 Two handles, one for each hand, shall be provided for all units.
4.5.2 The handles shall be designed so that the distance L (see figure D.2) between the
centre of the handles is at least 500 mm for those units which are intended to be equipped with metal saw blades,
and 250 mm for all others. For other details see figures D. 1 and D .3.
The handles shall be adjustable so that a suitable ergonomic working position can be achieved. An adjustment
below the minimum dimensions shall be prevented by design.
NOTE : The position of the operator relative to the cutting attachment is defined by the suspension point
(see 4.11 and 4.15) and the barrier (see 4.6)
All handles shall be designed so that they can be fully gripped by an operator when wearing different
4.5.3
types
of gloves, provide the necessary sureness of grip by their shaping and surface and have a length of at least 100
mm.
4.6 Barrier
Brush cutters shall be equipped with a barrier to prevent an unintentional contact with the cutting attachment. The
barrier shall project at least 200 mm horizontally perpendicularly from the centre-line of the shaft tube. The
handle assembly may serve as a barrier. See also figure D.2.
Adjustable barriers shall be in accordance with 4.5.2.
4.7 Throttle control
4.7.1 The throttle control linkage shall be so constructed that a force equal to three times the weight of
the unit (without cutting attachment and with empty tanks), applied in any direction to the handle with the throttle
trigger, shall not increase the engine speed to a point where the clutch engages and cutting attachment engages.
4.7.2
A unit shall be provided with a constant pressure throttle trigger that automatically reverts to the
idling position. Brush cutters shall either have a throttle trigger lockout or be so designed that a gauge of 10 mm
diameter and 200 mm length shall not move the throttle trigger to an extent that the cutting attachment becomes
engaged.
4.7.3 The throttle trigger shall be positioned so that it can be pressed and released with a glove
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