1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationHand-held motor-operated electric tools Safety Part 2-20: Particular requirements for band sawsBS EN 60745-2-20:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2
2、010 03:52, Uncontrolled Copy, (c) BSINational forewordThis British Standard is the UK implementation of EN 60745-2-20:2009. Itwas derived by CENELEC from IEC 60745-2-20:2003. It supersedes BS EN 60745-2-20:2003+A1:2009, which will be withdrawn The CENELEC common modifications have been implemented a
3、t the appropriate places in the text and are indicated by tags (e.g. ).The UK participation in its preparation was entrusted to Technical CommitteeCPL/116, Portable motor-operated tools.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication
4、does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 64800 7ICS 25.140.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
5、 of the StandardsPolicy and Strategy Committee on 31 March 2010Amendments/corrigenda issued since publicationAmd. No. Date Text affectedBRITISHSTANDARDBS EN 60745-2-20:2009, incorporating amendment1 May 2012.1:2008The start and finish of text introduced or altered by amendment is indicated in the te
6、xt by tags. Text indicating changes to IEC text carry the number of theIEC amendment. For example, text altered by IEC amendment 1 isindicated by .!“on Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 60745-2-20 NORME EUROPENNE E
7、UROPISCHE NORM September 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any for
8、m and by any means reserved worldwide for CENELEC members. Ref. No. EN 60745-2-20:2009 E English version Hand-held motor-operated electric tools - Safety - Part 2-20: Particular requirements for band saws (IEC 60745-2-20:2003, modified + A1:2008) Outils lectroportatifs moteur - Scurit - Partie 2-20:
9、 Rgles particulires pour les scies ruban (CEI 60745-2-20:2003, modifie + A1:2008) Handgefhrte motorbetriebene Elektrowerkzeuge - Sicherheit - Teil 2-20: Besondere Anforderungen fr Bandsgen (IEC 60745-2-20:2003, modifiziert + A1:2008) This European Standard was approved by CENELEC on 2009-07-01. CENE
10、LEC 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 a
11、pplication 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 Secre
12、tariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
13、 Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. ICS 25.140.20 Supersedes EN 60745-2-20:2003 + A1:2009 + A11:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI- 2 - Foreword Th
14、e text of the International Standard IEC 60745-2-20:2003, prepared by SC 61F (transformed into IEC TC 116, Safety of hand-held motor-operated electric tools), together with the common modifications prepared by the Technical Committee CENELEC TC 61F (transformed into TC 116) was submitted to the form
15、al vote and was approved by CENELEC as EN 60745-2-20 on 2003-09-01. A draft amendment (prAA) was prepared to align Subclause 6.2 with the new Subclause 6.2 in EN 60745-1. Moreover, vibration values determined with the new 6.2 are complying with the requirements of the Physical Agents Directive Vibra
16、tion 2002/44/EC. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A11 to EN 60745-2-20:2003 on 2007-06-01. The text of document 61F/738/FDIS future amendment 1 to IEC 60745-2-20:2003, was submitted to the IEC-CENELEC parallel vote and wa
17、s approved by CENELEC as amendment A1 to EN 60745-2-20:2003 on 2009-04-22. A further draft amendment (prAB), extending Annex ZZ to include the new MD 2006/42/EC, was submitted to the formal vote. The combined texts were approved by CENELEC as a new edition of EN 60745-2-20 on 2009-07-01. This Europe
18、an Standard supersedes EN 60745-2-20:2003 + A11:2007 + A1:2009. 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) 2010-02-01 - latest date by which the national standards conf
19、licting with the EN have to be withdrawn (dow) 2012-05-01 This standard is divided into two parts: Part 1: General requirements which are common to most hand-held electric motor operated tools (for the purpose of this standard referred to simply as tools) which could come within the scope of this st
20、andard; Part 2: Requirements for particular types of tools which either supplement or modify the requirements given in Part 1 to account for the particular hazards and characteristics of these specific tools. This European Standard has been prepared under a mandate given to CENELEC by the European C
21、ommission and the European Free Trade Association and covers essential requirements of EC Directives 98/37/EC (Machinery Directive), amended by Directive 98/79/EC, and of EC Directive 2006/42/EC. See Annex ZZA and Annex ZZB. Compliance with the clauses of Part 1 together with this Part 2 provides on
22、e means of conforming with the essential health and safety requirements of the Directive concerned. Warning: Other requirements and other EC Directives can be applicable to the products falling within the scope of this standard. This standard follows the overall requirements of EN ISO 12100-1 and EN
23、 ISO 12100-2. This Part 2-20 is to be used in conjunction with EN 60745-1:2009. When this standard states “addition“, “modification“ or “replacement“, the relevant text of Part 1 is to be adapted accordingly. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STAN
24、DARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI- 3 - Subclauses, tables and figures which are additional to those in Part 1 are numbered starting from 101. Subclauses, tables and figures which are additional to those in IEC 60745-2-20 are prefixed “Z”. NOTE In this standard, the following print
25、types are used: - Requirements: in roman type; - Test specification: in italic type; - Notes: in smaller roman type. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI- 4 - Endorsement notice The text of the
26、International Standard IEC 60745-2-20:2003 + A1:2008 was approved by CENELEC as a European Standard with agreed common modifications. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSIHAND-HELD MOTOR-OPERATED
27、 ELECTRIC TOOLS SAFETY Part 2-20: Particular requirements for band saws1 Scope2 Normative referencesThis clause of Part 1 is applicable.3 Terms and DefinitionsThis clause of Part 1 is applicable, except as follows:Addition:3.101band sawtool equipped with an endless loop blade4 General requirementsTh
28、is clause of Part 1 is applicable.5 General conditions for the testsThis clause of Part 1 is applicable.This clause of Part 1 is applicable, except as follows: Addition: This standard applies to band saws. !“! “6 Environmental requirements This clause of Part 1 is applicable except as follows: 6.1.2
29、.4 Modification: Band saws are suspended. The cutting part of the loop blade shall be horizontal. 6.1.2.5 Modification: Band saws are tested at no-load. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)- 5 -Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI
30、6.2 Vibration 6.2.4.2 Location of the measurement Addition: Figure Z101 shows the positions for band saws. 6.2.6.3 Operating conditions Modification: Band saws are tested under load observing the conditions shown in Tables Z101 or Z102. If the band saw is intended to cut metal, the test requirements
31、 of Table Z101 apply. If the band saw is intended to cut wood, the test requirements of Table Z102 apply. Table Z101 Operating conditions for band saws intended to cut metal Orientation Cutting rings in a vertical direction from a tube of mild steel. The tube shall have a diameter of 40 mm + 10 mman
32、d a wall thickness of 2 mm + 2 mm.The steel tube is clamped in a vice which is rigidly mounted on a workbench. The tube shall project 100 mm from the vice clamp and shall be readjusted at the beginning of each series of tests. Tool bit/ settings New saw band as specified for cutting of mild steel. S
33、peed setting devices shall be adjusted to the setting specified to cut mild steel. Feed force The force to be applied to the tool in addition to its weight shall be just as necessary to ensure stable sawing at a brisk pace. Equal force shall be applied to both handles, avoiding excessive grip forces
34、. Vibration reducing mechanisms shall not be overloaded to allow them proper operation. Test cycle A 10 mm wide ring is cut from the tube. Measurement starts when the band saw enters the tube and stops when the saw band leaves the tube. NOTE In general, stable operation is achieved by a feed force w
35、hich is not more than 50 N in addition to the weight of the tool. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E) - 6 -Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSITable Z102 Operating conditions for band saws intended to cut wood Orientation Cutting
36、 slices in vertical direction of a horizontal piece of softwood 50 mm x 50 mm with a minimum length of 200 mm. The workpiece shall be firmly clamped to a workbench using resilient material, which shall be mounted so that it does not have any significant resonance in the frequency range that can infl
37、uence the test result. The wood shall project 100 mm from the clamped area and shall be readjusted at the beginning of each series of tests. Tool bit/settings New saw band as specified for cutting softwood. Speed setting devices shall be adjusted to the setting specified to cut softwood. Feed force
38、Just sufficient to cut at a brisk pace. Equal force shall be applied to both handles, avoiding excessive grip forces. Vibration reducing mechanisms shall not be overloaded to allow them proper operation Test cycle One test cycle is given by cutting off one approximately 10 mm wide slice (set by rip
39、fence if available) across the wood. The measurement starts when the saw band enters the wood and finishes when the saw band leaves the wood. NOTE In general, stable operation is achieved by a feed force which is not more than 50 N in addition to the weight of the tool. 6.2.7.1 Reported vibration va
40、lue Addition: For band saws intended to cut metal, the result ah,CMin accordance with Table Z101 shall be reported: ah,CM= mean vibration “cutting metal”. For band saws intended to cut wood, the result ah,CWin accordance with Table Z102 shall be reported: ah,CW= mean vibration “cutting wood”. For sa
41、ws intended to cut both metal and wood, both ah,CMand ah,CWshall be reported. 6.2.7.2 Declaration of the vibration total value Addition: The vibration total value of the handle with the highest emission and the uncertainty K shall be declared: for band saws intended to cut metal the value of ah,CM,
42、with the work mode description “cutting metal”; for band saws intended to cut wood the value of ah,CW, with the work mode description “cutting wood”; for band saws intended to cut metal and wood the value of ah,CM, with the work mode description “cutting metal” and the value of ah,CW, with the work
43、mode description “cutting wood”. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)- 7 -Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI7 ClassificationThis clause of Part 1 is applicable.8 Marking and instructionsThis clause of Part 1 is applicable, excep
44、t as follows: 8.12.1.1 Addition: Hold power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessories contacting a “live“ wire may make exposed metal parts of the power tool “live“ and could give the o
45、perator an electric shock. !“9 Protection against access to live partsThis clause of Part 1 is applicable.10 StartingThis clause of Part 1 is applicable.11 Input and currentThis clause of Part 1 is applicable.12 HeatingThis clause of Part 1 is applicable.13 Leakage currentThis clause of Part 1 is ap
46、plicable.14 Moisture resistanceThis clause of Part 1 is applicable.15 Electric strengthThis clause of Part 1 is applicable.16 Overload protection of transformers and associated circuitsThis clause of Part 1 is applicable.BS EN 60745-2-20:2009EN 60745-2-20:2009 (E) - 8 -Licensed Copy: Wang Bin, ISO/E
47、XCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI18 Abnormal operationThis clause of Part 1 is applicable.19 Mechanical hazardsThis clause of Part 1 is applicable.17 EnduranceThis clause of Part 1 is applicable.20 Mechanical strengthThis clause of Part 1 is applicable.21 Construc
48、tionThis clause of Part 1 is applicable, except as follows:21.18.1 Addition: Tools with a no-load speed greater than 125 m/min shall not be equipped with a means of locking the switch in the “on” position. !“21.Z1 Addition: Band saws are not considered to be tools where a considerable amount of dust
49、 is produced. 22 Internal wiringThis clause of Part 1 is applicable.23 ComponentsThis clause of Part 1 is applicable.24 Supply connection and external flexible cordsThis clause of Part 1 is applicable.25 Terminals for external conductorsThis clause of Part 1 is applicable.BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)- 9 -Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/07/2010 03:52, Uncontrolled Copy, (c) BSI26 Provision for earthingThis clause of Part 1 is applicable.27 Screws and connectionsThis clause of Part 1 is a
