EN 774:1996/A3:2001

SLOVENSKI STANDARD
01-december-2001
Oprema za nego vrta - Prenosni motorni obrezovalniki žive meje - Varnost
Garden equipment - Hand-held, integrally powered hedge trimmers - Safety
Gartengeräte - Tragbare motorbetriebene Heckenscheren - Sicherheit
Matériel de jardinage - Taille-haies portatifs a moteur incorporé - Sécurité
Ta slovenski standard je istoveten z: EN 774:1996/A3:2001
ICS:
65.060.70 Vrtnarska oprema Horticultural equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 774:1996/A3
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2001
ICS 65.060.80
English version
Garden equipment - Hand-held, integrally powered hedge
trimmers - Safety
Matériel de jardinage - Taille-haies portatifs à moteur Gartengeräte - Tragbare motorbetriebene Heckenscheren -
incorporé - Sécurité Sicherheit
This amendment A3 modifies the European Standard EN 774:1996; it was approved by CEN on 4 February 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the Management Centre or to any CEN member.
This amendment 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 774:1996/A3:2001 E
worldwide for CEN national Members.

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Foreword
This Amendment EN 774:1996/A3:2001 to EN 774:1996 has been prepared by Technical Committee CEN/TC 144
"Tractors and machinery for agriculture and forestry", the secretariat of which is held by AFNOR.
This Amendment to the European Standard EN 774 :1996 shall be given the status of a national standard, either by
publication of an identical text or by endorsement, at the latest by September 2001, and conflicting national
standards shall be withdrawn at the latest by September 2001.
This Amendment to the European Standard EN 774:1996 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).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.
This amendment which specifically deals with vibration and noise, replaces the notes in the right hand column of
Table A.1 against hazard items 4.1, 4.2 and 5 listed in the left hand column.
The Annexes C and D are normative. Annex E is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.

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2 Normative references
Add the following references:
EN 292-2:1991/A1:1995, Safety of machinery - Basic concepts, general principles for design – Part 2: Technical
principles and specifications.
EN 28662-1:1992, Hand-held portable power tools - Measurement of vibrations at the handle – Part 1: General
(ISO 8662-1:1988).
EN ISO 354:1993, Acoustics – Measurement of sound absorption in a reverberation room (ISO 354:1985).
EN ISO 3744:1995, Acoustics - Determination of sound power levels of noise sources using sound pressure -
Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994).
EN ISO 11201:1995, Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound
pressure levels at a work station and at other specified positions - Engineering method in an essentially free field
over a reflecting plane (ISO 11201:1995).
EN ISO 11688-1:1998, Acoustics - Recommended practice for the design of low-noise machinery and equipment –
Part 1: Planning (ISO/TR 11688-1:1995).
ISO 7293:1997, Forestry machinery - Portable chain saws - Engine performance and fuel consumption.
4 Safety requirements and/or measures
Add the following sub-clauses 4.8 and 4.9:
4.8 Vibration
4.8.1 Reduction by design and protective measures
The machine shall be designed to generate a vibration level as low as practicable. 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.
NOTE 1 CR 1030-1:1995 gives general technical information on widely recognised technical rules and means to be followed in
the design of machines for low hand-arm vibration solutions.
NOTE 2 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.
4.8.2 Reduction by information
After taking possible technical measures for vibration reduction, it is still recommended that, when appropriate, the
instruction handbook recommends:

the use of low-vibration operating modes, and/or limited time of operation;

the wearing of personal protection equipment (PPE).

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4.8.3 Vibration measurement
For the measurement of hand-arm vibration the methods given in Annex C shall be used.
4.9 Noise
4.9.1 Reduction as a safety requirement
4.9.1.1 Reduction at source by design and protective measures
The machine shall generate a noise level as low as practicable. The main sources causing noise for combustion
engine driven machines are:

air intake system ;

engine cooling system ;

engine exhaust system ;

cutting system ;

vibrating surfaces.
EN ISO 11688-1:1998 gives general technical information on widely recognised technical rules and means to be
followed in the design of low-noise machines. For combustion engine driven machines special care shall be taken
in the design of the exhaust system and the selection of the silencer.
NOTE EN ISO 11691:1995 and EN ISO 11820:1996 can be used for the testing of the silencer.
4.9.1.2 Reduction by information
If after taking all possible technical measures for reducing noise at the design stage a manufacturer considers that
further protection of the operator is necessary, then the instruction handbook shall:

recommend the use of low-noise operating modes, and/or limited time of operation ;

give a warning of the noise level and recommend the use of ear protection.
4.9.2 Noise emission measurement
The determination of the sound power level and of the emission sound pressure level at the operator’s position
shall be carried out using the measurement methods given in Annex D.
5 Information for use
5.2 Instruction handbook
Insert the following paragraph:
The instruction handbook and the technical documentation describing the machine shall :

give the declared noise emission values of the machinery in accordance with 1.7.4 f) of Annex A of
EN 292-2:1991/A1:1995;

give reference to the noise test code specified in Annex D;

give the declared vibration values of the machinery in accordance with 3.6.3 of Annex A of
EN 292-2:1991/A1:1995;

give reference to the vibration test code specified in Annex C

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Annex A
Amend Table A.1, rows 4.1, 4.2 and 5 as follows:

 






 


 
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Add the following Annexes C and D (normative) and Annex E (informative):

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Annex C
(normative)
Vibration
C.1 Quantities to be measured
The values measured shall be:

acceleration according to 3.1 of EN 28662-1:1992, presented as weighted acceleration a according to 3.3 of
h,W
EN 28662-1:1992 ;

rotational speed of the engine.
C.2 Instrumentation
C.2.1 General
For specification of instrumentation see 4.1 of EN 28662-1:1992.
C.2.2 Transducer
For specifications of transducer see 4.1 of EN 28662-1:1992.
C.2.3 Fastening of transducer
Fastening of transducer shall be in accordance with 4.2 of EN 28662-1:1992.
C.2.4 Calibration
Calibration shall be made in accordance with 4.8 of EN 28662-1:1992.
C.3 Measurement direction and measurement location
C.3.1 Measurement direction
Measurements shall be made on each handle for the 3 directions x, y and z (see Figures C.1 and C.2).
C.3.2 Measurement location
Typical locations of the transducer assemblies and directions of measurement are shown in Figures C.1 and C.2.
C.4 Test procedure
C.4.1 Determination of working procedure
Tests shall be carried out on a new, normal production machine featuring standard equipment with the machine
provided by the manufacturer.
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The machine shall be run-in and warmed up until stable conditions are reached before the test is commenced. The
carburettor and ignition shall be set and the cutting device(s) lubricated according to the instructions of the
manufacturer.
Measurements shall be made with full tanks at an engine speed which is 133 % of the speed at maximum engine
power as determined in accordance with ISO 7293:1997. If the engine has a governor which is below that speed
the measurement shall be made at the maximum revolution speed stipulated by the manufacturer with the cutting
means engaged.
During the test the cutting means shall be driven. Contact between the hand and the transducer shall be avoided.
C.4.2 Measurement procedure
For each handle a series of five tests shall be carried out using one operator. The hedge trimmer shall be held with
the axis of the cutting device orientated as in the normal rest position on a horizontal surface.
NOTE 1 Issues such as the validity of the tests and the number of test operators are to be considered for future revision in
the light of experience gained using the present test method.
Each reading shall be obtained from the signal time suitable for the test equipment being used. Duration of the test
shall not be less than 8 s.
NOTE 2 An equivalent level of accuracy may be achieved by using a shorter duration than 8 s. In this case the equivalence
of the results should be justifiable.
Measurement for the three directions (see C.3.1) shall be made simultaneously.
C.5 Determination of the measurement result
The measurement result of each handle shall be determined as the arithmetic mean over the a value of each
h,W
test. If a single figure is quoted it shall be the higher of the two.

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Dimensions in millimetres
X
Z
X
Y
Z
Y
NOTE If the measurement of 80 mm cannot be obtained, the transducer is placed at the rear end of that portion of the handle
intended to be grasped.
Figure C.1 - Examples of transducer location/orientation (longitudinal rear handle)

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Dimensions in millimetres
X
X
X
Z
Y
Z
Z
Z
Y
Y
NOTE If the measurement of 80 mm cannot be obtained, the transducer is placed as close as possible to this position,
avoiding contact with the hand.
Figure C.2 - Examples of transducer location/orientation (lateral rear handle)

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Annex D
(normative)
Noise test code – Engineering method (grade 2)
NOTE This Annex only applies to combustion engine powered hedge trimmers. The method for electric machines is given in
EN 50144-2-15:1997.
D.0 Scope
This noise test code specifies the information necessary to carry out efficiently and under standardised conditions
the determination of the noise emission characteristics of hand-held, integrally powered hedge trimmers.
Noise emission characteristics include the emission sound pressure level at the operator position and the sound
power level. The determination of these quantities is necessary for :

manufacturers to declare the noise emitted;

comparing the noise emitted by machines in the family concerned;

purposes of noise control at the source at the design stage.
The use of this noise test code ensures reproducibility of the determination of the noise emission characteristics
within specified limits determined by the grade of accuracy of the basic noise measurement method used. Noise
measurement methods allowed by this Standard give results with Grade 2 of accuracy.
D.1 Sound power level determination
For the determination of sound power level, EN ISO 3744:1995 shall be used subject to the following modifications:

the reflecting surface shall be replaced by an artificial surface or by natural grass which complies with D.3.
Reproducibility of results using natural grass is likely to be lower than that required for Grade 2 of accuracy. In
the case of dispute, measurements shall be carried out in the open air and on the artificial surface;

the measurement surface shall be a hemisphere with a radius, r, of 4 m;

the microphone array shall be composed of six microphone positions as defined in Figure D.1 and Table D.1;

environmental conditions shall
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