BS EN 60335-2-77:2010 BSI Standards Publication Safety of household and similar appliances Part 2-77: Particular requirements for pedestrian-controlled walk-behind electrically powered lawn mowers BRITISH STANDARD BS EN 60335-2-77:2010 National foreword This British Standard is the UK implementation of EN 60335-2-77:2010 It was derived by CENELEC from IEC 60335-2-77:2002 It supersedes BS EN 50338:2006 and BS EN 60335-2-77:2006, which will be withdrawn on September 2013 The UK participation in its preparation was entrusted by Technical Committee CPL/61, Safety of household and similar electrical appliances, to Subcommittee CPL/61/23, Lawnmowers A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2010 ISBN 978 580 62551 ICS 65.060.70; 97.030 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2010 Amendments issued since publication Amd No Date Text affected EUROPEAN STANDARD EN 60335-2-77 NORME EUROPÉENNE September 2010 EUROPÄISCHE NORM ICS 65.060.70 Supersedes EN 50338:2006, EN 60335-2-77:2006 English version Safety of household and similar appliances Part 2-77: Particular requirements for pedestrian-controlled walk-behind electrically powered lawn mowers (IEC 60335-2-77:2002, modified) Appareils électrodomestiques et analogues - Sécurité Partie 2-77: Règles particulières pour les tondeuses gazon fonctionnant sur le réseau et conducteur pied (CEI 60335-2-77:2002, modifiée) Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke Teil 2-77: Besondere Anforderungen für handgeführte elektrisch betriebene Rasenmäher (IEC 60335-2-77:2002, modifiziert) This European Standard was approved by CENELEC on 2010-09-01 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 60335-2-77:2010 E BS EN 60335-2-77:2010 EN 60335-2-77:2010 -2- Foreword The text of the International Standard IEC 60335-2-77:2002, prepared by SC 61F, Safety of hand-held motor-operated electric tools, of IEC TC 61, Safety of household and similar electrical appliances, together with the common modifications prepared by the Technical Committee CENELEC TC 61F, Safety of hand-held and transportable motor-operated electric tools, was submitted to the CENELEC formal vote and was approved as EN 60335-2-77 on 2010-09-01 This document supersedes EN 50338:2006 and EN 60335-2-77:2006 The text of EN 60335-2-77:2006 has been revised by CLC/TC 116/WG 5, Garden appliances, to add the mechanical requirements and bring this standard in line with the Machinery Directive 2006/42/EC Additionally the safety requirements for battery powered lawnmowers have been included to replace EN 50338:2006; therefore the title is renamed Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights 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) 2011-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-09-01 This Part 2-77 is to be used in conjunction with EN 60335-1 This Part 2-77 supplements or modifies the corresponding clauses of EN 60335-1, so as to convert it into the European Standard: Particular requirements for pedestrian-controlled walk-behind electrically powered lawn mowers When a particular subclause of Part is not mentioned in this Part 2-77, that subclause applies as far as is reasonable When this standard states “addition”, “modification” or “replacement”, the relevant text of Part is to be adapted accordingly This European Standard has been prepared under Mandate M/396 given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EU Directive 2006/42/EC See Annex ZZ There are no special national conditions causing a deviation from this European Standard, other than those listed in Annex ZA to EN 60335-1 There are no national deviations from this European Standard, other than those listed in Annex ZB to EN 60335-1 Other harmonised standards referred to in this European Standard are listed in Annex ZC of Part 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 -3- BS EN 60335-2-77:2010 EN 60335-2-77:2010 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 BS EN 60335-2-77:2010 EN 60335-2-77:2010 -4- Contents Introduction .7 1 Scope 8 2 Normative references 8 3 Definitions 10 4 General requirement 13 5 General conditions for the tests 13 6 Classification 13 7 Marking and instructions 13 8 Protection against access to live parts 16 9 Starting of motor-operated appliances 16 10 Power input and current 16 11 Heating 17 12 Void 17 13 Leakage current and electric strength at operating temperature 17 14 Transient overvoltages 17 15 Moisture resistance 17 16 Leakage current and electric strength 17 17 Overload protection of transformers and associated circuits 17 18 Endurance 17 19 Abnormal operation 18 20 Stability and mechanical hazards 18 21 Mechanical strength 39 22 Construction 46 23 Internal wiring 48 24 Components 48 25 Supply connection and external flexible cords 49 26 Terminals for external conductors 49 27 Provision for earthing 49 28 Screws and connections 50 29 Clearances, creepage distances and solid insulation 50 30 Resistance to heat and fire 50 31 Resistance to rusting 50 32 Radiation, toxicity and similar hazards 50 -5- BS EN 60335-2-77:2010 EN 60335-2-77:2010 Annexes 51 Annex B (normative) Appliances powered by rechargeable batteries 51 Annex AA (normative) Safety signs and symbols 52 Annex BB (normative) Test enclosure target panels – Corrugated fibreboard penetration test (see 20.107.3.3.2) 55 Annex CC (normative) Target panel elevation areas and suggested data sheet for thrown object test (see 20.107.3.3) 57 Annex DD (normative) Test enclosure (see 20.107.4.1) 59 Annex EE (informative) Safety instructions for lawnmowers 63 Annex FF (normative) Vibration 66 Annex GG (normative) Noise test code – Engineering method (grade 2) 71 Annex HH (informative) Example of a material and construction fulfilling the requirements for an artificial surface 77 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives 79 Bibliography 80 Figures Figure – Operator zone – Pedestrian controlled lawn mower (see 20.103) 20 Figure – Foot probe test (see 20.101) 21 Figure – Handle distance (see 20.107.6.1) and rear cutting means enclosure (see 20.107.1.1) 25 Figure – Front opening restrictions for single spindle lawnmowers (see 20.107.1.1.2) 26 Figure – Front opening restrictions for multi-spindle lawnmowers (see 20.107.1.1.2) 26 Figure – Construction for front opening (see 20.107.1.1.2) 27 Figure – Example of test cycle (see 20.107.2.1) 29 Figure – Thrown object test fixture – General layout (see 20.107.3.3 and 20.107.4.1.3) 31 Figure – Single spindle lawnmower – Test enclosure (see 20.107.4) 33 Figure 10 – Multi-spindle lawnmower – Test enclosure (see 20.107.4) 34 Figure 11 – Test of cutting cylinder guarding (see 20.108.1.1) 36 Figure 12 – Side coverage of cutting cylinders (see 20.108.1.2) 37 Figure 13 – Top coverage of cutting cylinders (see 20.108.1.3) 37 Figure 14 – Rear coverage of cutting cylinders (see 20.108.1.4) 38 Figure 15 – Cylinder mower – Throw line (see 20.108.2) 39 Figure 16 – Example of suitable impact test fixture (see 20.101.2.1) 41 Figure 17 – Structural integrity tests (see 21.101.4.1.1) 45 Figure 18 – Impact test fixture for handle insulation 47 Figure AA.1 – Pictogram illustrating “Read operator’s manual” 52 Figure AA.2 – Pictogram illustrating “Keep bystanders away” 52 Figure AA.3 – Pictogram illustrating “Beware of sharp blades Blades continue to rotate after the motor is switched off – remove plug from mains before maintenance or if cord is damaged.” for mains operated machines 53 Figure AA.4 – Pictogram illustrating “Beware of sharp blades Blades continue to rotate after the motor is switched off – Remove disabling device before maintenance” for battery operated machines 53 Figure AA.5 – Pictogram illustrating “Keep supply flexible cord away from cutting means” for mains operated machines 54 BS EN 60335-2-77:2010 EN 60335-2-77:2010 -6- Figure BB.1 – Test fixture for corrugated fibreboard penetration test 56 Figure CC.1 – Example of data sheet for thrown object test 58 Figure DD.1 – Nail plan of test enclosure base 60 Figure DD.2 – Object test enclosure – Base detail 61 Figure DD.3 – Test enclosure walls and base 62 Figure FF.1 – Examples of transducer location/orientation (pedestrian controlled machines) 68 Figure FF.2 – Examples of transducer location/orientation for hand-arm vibration 69 Figure GG.1 – Microphone positions on the hemisphere (see Table GG.1) 72 Figure HH.1 – Sketch of the measurement surface covered with an artificial surface (not to scale) 78 Tables Table – Sizing of test fixture air inlet holes 43 Table GG.1 – Co-ordinates of microphone positions 73 Table GG.2 – Absorption coefficients 74 -7- BS EN 60335-2-77:2010 EN 60335-2-77:2010 Introduction This document is a C type standard as stated in EN ISO 12100-1 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 BS EN 60335-2-77:2010 EN 60335-2-77:2010 -8- Scope This clause of Part is replaced by the following This European Standard specifies safety requirements and their verification for the design and construction of pedestrian controlled walk-behind electrically powered lawnmowers This standard applies in conjunction with EN 60335-1 This European Standard does not apply to − lawn trimmers, lawn edge trimmers, lawn edgers, flail mowers, scrub cutters, automatic (robot) lawn mowers, sickle-bar mowers, agricultural mowers, trailing seat/sulky units, ride-on machines or nonpowered lawnmowers − rotary lawnmowers for which the cutting means is a generally circular central drive unit on which is mounted, either one or more non-metallic filaments or one or more non-metallic, pivotally mounted cutting elements These cutting elements rely on centrifugal force to achieve cutting, with the kinetic energy of a single cutting element not exceeding 10 J, − battery powered lawnmowers with a rated voltage of the battery more than 42 V d.c Requirements for battery chargers, including those incorporated into the machine are dealt with in EN 60335-2-29 This European Standard is not applicable to lawnmowers, which are manufactured before the date of publication of this document by CENELEC NOTE Combustion engine driven machines are covered by EN 836 Normative references This clause of Part is applicable except as follows Addition: EN 60320-2-3, Appliance couplers for household and similar general purposes – Part 2-3: Appliance couplers with a degree of protection higher than IPX0 (IEC 60320-2-3) EN 60335-1, Household and similar electrical appliances – Safety – Part 1: General requirements (IEC 60335-1, mod.) EN 60335-2-29, Household and similar electrical appliances – Safety – Part 2-29: Particular requirements for battery chargers (IEC 60335-2-29) EN ISO 354:1993 1), 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 3767-1:1995 2), Tractors, machinery for agriculture and forestry, powered lawn and garden equipment – Symbols for operator controls and other displays – Part 1: Common symbols (ISO 3767-1:1991) 1) Superseded by EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003) 2) Superseded by 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), withdrawn BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 68 - Dimensions in millimetres Key a = 100 Figure FF.1 – Examples of transducer location/orientation (pedestrian controlled machines) - 69 - BS EN 60335-2-77:2010 EN 60335-2-77:2010 Key Machine front Figure FF.2 – Examples of transducer location/orientation for hand-arm vibration BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 70 - FF.4.2 Hand-arm vibration Testing shall be carried out with the machine stationary and at the maximum operating motor speed FF.4.2.1 Machines Adjustable handles of machines shall be set to suit the operator The cutting height shall be set to 30 mm or the next higher cutting position when set on a hard level surface Machines with a maximum cutting height setting of 30 mm or less shall be set at their maximum height setting Measurements shall be carried out on a surface in accordance with Annex HH FF.5 Measurement procedure For each transducer position a series of five tests shall be carried out using one operator NOTE Issues such as validity of test and 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 a signal time suitable for the test equipment being used Duration of the test shall not be less than s NOTE An equivalent level of accuracy may be achieved by using a shorter duration than s In this case equivalence of the results should be justifiable Measurement for the three directions shall be made simultaneously FF.6 Determination of the measurement result FF.6.1 Hand-arm The measurement result of each hand position shall be determined as the arithmetic mean over the ah,w values of each test If a single figure is quoted it shall be the higher of the two - 71 - BS EN 60335-2-77:2010 EN 60335-2-77:2010 Annex GG (normative) Noise test code – Engineering method (grade 2) GG.0 Scope This noise test code specifies the information necessary to carry out efficiently and under standardized conditions the determination of the noise emission characteristics of lawnmowers 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 of accuracy GG.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 Clause GG.3 Reproducibility of results using natural grass is likely to be lower than that required for grade 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, which depends on the width of cut of the machine under test and which shall be: a) r = m for machines with a width of cut up to 1,2 m; b) r = 10 m for machines with a width of cut exceeding 1,2 m; − the microphone array shall be six microphone positions as defined in Figure GG.1 and Table GG.1; − environmental conditions shall be within the limits specified by the manufacturers of the measuring equipment The ambient air temperature shall be in the range from °C to 30 °C and the wind speed shall be less than m/s and preferably less than m/s; − for measurements in the open air K2A = 0; − for measurements indoors the value of K2A, determined without artificial surface and in accordance with Annex A of EN ISO 3744:1995, shall be ≤ dB, in which case K2A shall be disregarded BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 72 - Dimensions in metres Ke y r = radius of hemisphere Figure GG.1 – Microphone positions on the hemisphere (see Table GG.1) BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 73 - Table GG.1 – Co-ordinates of microphone positions Position no x y r r + 0,7 + 0,7 1,5 m - 0,7 + 0,7 1,5 m - 0,7 - 0,7 1,5 m + 0,7 - 0,7 1,5 m - 0,27 + 0,65 0,71 r + 0,27 - 0,65 0,71 r z GG.2 A-weighted emission sound pressure level determination For the determination of the A-weighted emission sound pressure level, EN ISO 11201:1995 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 Clause GG.3 Reproducibility of results using natural grass is likely to be lower than that required for grade of accuracy In the case of dispute, measurements shall be carried out in the open air and on the artificial surface; − environmental conditions shall be within the limits specified by the manufacturers of the measuring equipment The ambient air temperature shall be in the range from °C to 30 °C, and the wind speed shall be less than m/s and preferably less than m/s; − the microphone shall be head mounted 200 mm ± 20 mm from the median plane of the head on the louder side and in line with the eyes The operator shall stand or sit upright and look straight ahead The microphone shall be aimed with its axis of maximally flat response (as specified by the manufacturer) pointing forwards and at an angle of 45° downwards from the horizontal The operator shall wear a helmet on which the microphone may be attached The helmet shall be of a shape so that its outer edge is at least 30 mm closer to the head than the microphone The operator shall be 1,75 m ± 0,05 m tall When measuring the emission sound pressure level at the operator position, tests shall be repeated to attain the required grade of accuracy, and until three consecutive A-weighted results give values within not more than dB The arithmetic average of these shall be the measured A-weighted emission sound pressure level of the machine GG.3 Requirements for test floor GG.3.1 Artificial surface The artificial surface shall have absorption coefficients as given in Table H.2, measured in accordance with EN ISO 354:1993 BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 74 - Table GG.2 – Absorption coefficients Frequencies Absorption coefficients Tolerance 125 0,1 ± 0,1 250 0,3 ± 0,1 500 0,5 ± 0,1 000 0,7 ± 0,1 000 0,8 ± 0,1 000 0,9 ± 0,1 Hz The artificial surface shall be placed on a hard, reflecting surface and have a size of at least 3,6 m × 3,6 m placed at the centre of the test environment The construction of the supporting structure shall be such that the requirements for the acoustic properties are also met with the absorptive material in place The structure shall support the operator to avoid compression of the absorbing material NOTE See Annex HH for an example of a material and construction which can be expected to fulfil these requirements GG.3.2 Natural grass The test environment shall be covered, at least for the horizontal projection of the measurement surface used, with high-quality natural grass Before the measurements are taken, the grass shall be cut with a mower to a height of cut as near as possible to 30 mm The surface shall be clean of grass clippings and debris and shall be visibly free of moisture, frost or snow GG.4 Installation, mounting and operating conditions Measurements shall be carried out on a new, normal production machine featuring standard equipment as provided by the manufacturer If a grass catcher is provided or available for the machine from the manufacturer, it shall be fitted and empty For cylinder (reel) mowers, the rotating cutting cylinder(s) and/or the stationary cutting edge(s) shall be adjusted using one of the following two procedures, which shall be mentioned in the test report, such that: − either a sheet of Kraft paper, as defined in ISO 4046:1978, with a grammage (substance) of 80 g/m² is cut at least along 50 % of the width of cut; or − the gap between moving and stationary cutting meanss at standstill does not exceed 0,15 mm over the whole width of cut when checked with calibrated strip gauges Cutting meanss and knives of cylinder (reel) mowers shall be lubricated with SAE 20/50 grade oil If the maximum height of cut of the machine is greater than 30 mm, the height of cut shall be adjusted to the lowest position provided, but not lower than 30 mm If the maximum height of cut of the machine is less than 30 mm, the height of cut shall be adjusted to the highest position provided The height of cut shall be adjusted with the machine resting on a hard, flat surface NOTE For cylinder (reel) mowers, care should be taken to avoid overheating the cutting meanss by operating continuously (without cutting grass) and therefore appropriate interruptions for cooling and lubrication should be introduced For electric motors supplied from mains, the machine shall be run until stable conditions are reached before the test is commenced The rated voltage or the upper limit of the rated voltage range and/or frequency shall be maintained during the test at 0,98 to 1,02 times the stated values The supply voltage of mains powered machines is measured at the plug of the cable or cord supplied, not at the plug of any extension cable or cord - 75 - BS EN 60335-2-77:2010 EN 60335-2-77:2010 For electric motors supplied from batteries, noise measurements shall be started with fully charged batteries as specified by the manufacturer but shall not be continued when the battery voltage under load drops to lower than 0,9 times the battery voltage under load at the beginning of the measurements for lead-acid batteries, or to lower than 0,8 times for other batteries The battery voltage shall be measured at the battery terminals During the test the cutting means shall be engaged and unloaded The test shall be carried out at the maximum operating motor speed (see 3.117) A motor speed indicator shall be used to check the speed of the motor It shall have an accuracy of ± 2,5 % of the reading The indicator and its engagement with the machine shall not affect the operation during the test For the sound power level determination, machines shall be measured by placing them on the surface in such a way that the projection of the geometrical centre of their main parts (excluding handle, grass catcher etc.) coincides with the origin of the coordinate system of the microphone positions If an artificial surface in accordance with Clause GG.3 is used, it shall be placed so that its geometrical centre also coincides with the origin of the coordinate system of the microphone positions The longitudinal axis of the machine shall be on the x axis The measurement shall be carried out without an operator For the sound pressure level determination, adjustable features (e.g handle height,) shall be set to suit the operator GG.5 Measurement uncertainty A standard deviation of reproducibility of 0,5 to 1,5 dB is expected for the A-weighted emission sound pressure level determined according EN ISO 11201.The same applies for the sound power level determined according to EN ISO 3744 GG.6 Information to be recorded The information to be recorded shall cover all of the technical requirements of this noise test code) Any deviations from this noise test code or from the basic standards that have been applied are to be recorded together with the technical justification for such deviations GG.7 Information to be reported The information included in the test report shall cover at least that which is required to prepare a noise declaration or to verify the declared values As a minimum, the following information shall be included: - reference to the basic noise emission standards used - description of mounting and operating conditions used - locations of work stations and other specified positions determining LpA - noise emission values obtained It shall be confirmed that all requirements of the noise test code according to this standard have been fulfilled, or, if this is not the case, any unfulfilled requirements shall be identified Deviations from the requirements shall be stated and technical justification for the deviations shall be given GG.8 Declaration and verification of noise emission values The declaration of the A-weighted emission sound pressure level shall be made as a dual number noise emission declaration according to EN ISO 4871: 1996 It shall declare the noise emission value LpA and separately the respective uncertainty KpA The declaration of the A-weighted sound power level LWA shall be made as a single number noise emission declaration according to EN ISO 4871: 1996, thus declaring the sum of LWA and the respective uncertainty KWA The noise emission values shall be rounded to the highest decibel BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 76 - The noise declaration shall state that the noise emission values have been obtained according to this noise test code and to the basic standards EN ISO 11201:1996 and EN ISO 3744: 1995 If this statement is not true, the noise emission declaration shall indicate clearly what the deviations are from this standard and/or from the basic standards If undertaken, verification shall be done according to EN ISO 4871: 1996 by using the same mounting, installation and operating conditions as those used for the initial determination of the noise emission values BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 77 - Annex HH (informative) Example of a material and construction fulfilling the requirements for an artificial surface HH.1 Material Mineral fibre, 20 mm thick, having an airflow resistance of 11 kN.s/m and a density of 25 kg/m³ HH.2 Construction As is shown in Figure HH.1, the artificial flooring of the measurement site is sub-divided into nine joint planes, each of approximately 1,20 m x 1,20 m The backing layer of the construction as shown in Figure HH.1 consists of chipboard, 19 mm thick, coated with a plastics material on both sides Such boards are used, for example, for the construction of kitchen furniture The cut edges of the chipboards should be protected against moisture by applying a coat of plastic paint The outsides of the flooring are bordered by a two-legged aluminium section, its leg height being 20 mm Sections of this profile material are also screwed to the edges of the joint planes where they serve as spacers and attachment points On the middle joint plane on which the machine is placed during measurement as well as any other place on which the operator can get to stand on, aluminium T-sections with a leg length of 20 mm are mounted as spacers These sections also provide exact markings which facilitate the alignment of the machine in the middle of the measurement site The prepared boards are then covered with the insulating felt material cut to size The felt flooring of the joint planes which are neither stood on nor driven over (type A surface in Figure HH.1) are covered with a simple wire mesh fastened to the edge strips and to the attachment points; for this purpose, the sections should be provided with holes Thus, the material is adequately attached, but it remains possible to replace the felt material should it become soiled As a wire mesh, a so-called aviary wire with a mesh width of 10 mm and a wire diameter of 0,8 mm has proved to be suitable This wire appears to protect the surface adequately without affecting the acoustic conditions Protection by simple wire mesh is not, however, sufficient in the area subjected to traffic (type B surface in Figure HH.1) For these surfaces, the use of wire grating of corrugated steel wire with a diameter of 3,1 mm and a mesh width of 30 mm has proved to be suitable The construction of the measurement site as described above offers two advantages: it can be prepared without much time and effort, and all the materials are easily obtainable The fact that the microphone positions are not situated directly above the flooring of the measurement site allows the microphones to be easily mounted on stands, assuming that the ground is even and hard as, for example, an asphalt or concrete site When arranging the microphones, account has to be taken of the fact that the height of the microphones has to be determined in relation to the surface of the flooring of the measurement site It shall, therefore, be 40 mm higher when measuring from the ground under the microphone BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 78 - Dimensions in millimetres Key “A” This surface is not suitable to carry weight Do not stand on or drive over “B” This surface is suitable to carry weight May be stood on or driven over a Backing layer of plastics coated chipboard (nominally 19 mm thick) b Mineral wool fibre layer (nominally 20 mm thick) c Aluminium T-sections (nominally mm thick × 20 mm high) d Aluminium U-sections (nominally mm thick × 20 mm high) e Wire mesh (nominally 10 mm × 10 mm mesh made of 0,8 mm diameter steel wire) f Wire grating (nominally 30 mm × 30 mm mesh made of 3,1 mm diameter steel wire) NOTE Unless otherwise stated, all dimensions are approximate Figure HH.1 – Sketch of the measurement surface covered with an artificial surface (not to scale) - 79 - BS EN 60335-2-77:2010 EN 60335-2-77:2010 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers all relevant essential requirements as given in EC Directive 2006/42/EC (Machinery Directive) Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard BS EN 60335-2-77:2010 EN 60335-2-77:2010 - 80 - Bibliography The bibliography of Part is applicable This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions Our British Standards and other publications are updated by amendment or revision The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our open consultation process Organizations of all sizes and across all sectors choose standards to help them achieve their goals Information on standards We can provide you with the knowledge that your organization needs to succeed Find out more about British Standards by visiting our website at bsigroup.com/standards or contacting our Customer Services team or Knowledge Centre Buying standards You can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at bsigroup.com/shop, where hard copies can also be purchased If you need international and foreign standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team Subscriptions Our range of subscription services are designed to make using standards easier for you For further information on our subscription products go to bsigroup.com/subscriptions With British Standards Online (BSOL) you’ll have instant access to over 55,000 British and adopted European and international standards from your desktop It’s available 24/7 and is refreshed daily so you’ll always be up to date You can keep in touch with standards developments and receive substantial discounts on the purchase price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member PLUS is an updating service exclusive to BSI Subscribing Members You will automatically receive the latest hard copy of your standards when they’re revised or replaced To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit bsigroup.com/shop With a Multi-User Network Licence (MUNL) you are able to host standards publications on your intranet Licences can cover as few or as many users as you wish With updates supplied as soon as they’re available, you can be sure your documentation is current For further information, email bsmusales@bsigroup.com BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK We continually improve the quality of our products and services to benefit your business If you find an inaccuracy or ambiguity within a British Standard or other BSI publication please inform the Knowledge Centre Copyright All the data, software and documentation set out in all British Standards and other BSI publications are the property of and copyrighted by BSI, or some person or entity that owns copyright in the information used (such as the international standardization bodies) and has formally licensed such information to BSI for commercial publication and use Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI Details and advice can be obtained from the Copyright & Licensing Department Useful Contacts: Customer Services Tel: +44 845 086 9001 Email (orders): orders@bsigroup.com Email (enquiries): cservices@bsigroup.com Subscriptions Tel: +44 845 086 9001 Email: subscriptions@bsigroup.com Knowledge Centre Tel: +44 20 8996 7004 Email: knowledgecentre@bsigroup.com Copyright & Licensing Tel: +44 20 8996 7070 Email: copyright@bsigroup.com