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 60745-2-20:2009National forewordThis British Standard is the UK implementatio
2、n 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 It supersedes BS EN 60745-2-20:2003+A1:2009, which will be withdrawn The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by tags (e.g. ).The UK participation in its
3、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 does not purport to include all the necessary provisions of acontract. Users are responsible for it
4、s 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 of the StandardsPolicy and Strategy Committee on 31 March 2010Amendments/corrigenda issued since p
5、ublicationAmd. 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 text by tags. Text indicating changes to IEC text carry the number of theIEC amendment. For example,
6、text altered by IEC amendment 1 isindicated by .!“on EUROPEAN STANDARD EN 60745-2-20 NORME EUROPENNE EUROPISCHE NORM September 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central
7、 Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form 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 ban
8、d saws (IEC 60745-2-20:2003, modified + A1:2008) Outils lectroportatifs moteur - Scurit - Partie 2-20: 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 6074
9、5-2-20:2003, modifiziert + A1:2008) This European Standard was approved by CENELEC on 2009-07-01. 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. U
10、p-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 translatio
11、n 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, Cyprus, the Czech Republic, Denmark, Estonia, Finland
12、, 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. ICS 25.140.20 Supersedes EN 60745-2-20:2003 + A1:2009 + A11:2007- 2 - Foreword
13、 The 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 f
14、ormal 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 Vi
15、bration 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
16、 was 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 Eur
17、opean 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 c
18、onflicting 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
19、 standard; 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 Europea
20、n Commission 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
21、 one 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
22、 EN 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)- 3 - Subclauses, tables and figures which ar
23、e 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 types are used: - Requirements: in roman type; - Test specification: in italic type; - Notes: in
24、 smaller roman type. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)- 4 - Endorsement notice The text of the 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)HAND-HELD MOTOR-OP
25、ERATED 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 requirem
26、entsThis 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:
27、 6.1.2.4 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 -6.2 Vibration 6.2.4.2 Location of the measurement Addition: Figure Z101 shows the positions f
28、or 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 of Table Z101 apply. If the band saw is intended to cut wood, the test requirements of Table
29、 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 mmand a wall thickness of 2 mm + 2 mm.The steel tube is clamped in a vice which is rigidly mounte
30、d 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. Speed setting devices shall be adjusted to the setting specified to cut mild steel. Feed force
31、 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. Vibration reducing mechanisms shall not be overloaded to allow them proper operation. Test
32、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 which is not more than 50 N in addition to the weight of the tool. BS EN 60745-2-20:2009EN 607
33、45-2-20:2009 (E) - 6 -Table Z102 Operating conditions for band saws intended to cut wood Orientation Cutting 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, wh
34、ich shall be mounted so that it does not have any significant resonance in the frequency range that can influence 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 cut
35、ting softwood. Speed setting devices shall be adjusted to the setting specified to cut softwood. Feed force 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
36、 operation Test cycle One test cycle is given by cutting off one approximately 10 mm wide slice (set by rip 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
37、 feed force which is not more than 50 N in addition to the weight of the tool. 6.2.7.1 Reported vibration value 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, t
38、he result ah,CWin accordance with Table Z102 shall be reported: ah,CW= mean vibration “cutting wood”. For saws 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 highes
39、t emission and the uncertainty K shall be declared: for band saws intended to cut metal the value of ah,CM, 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 wo
40、od the value of ah,CM, with the work mode description “cutting metal” and the value of ah,CW, with the work mode description “cutting wood”. BS EN 60745-2-20:2009EN 60745-2-20:2009 (E)- 7 -7 ClassificationThis clause of Part 1 is applicable.8 Marking and instructionsThis clause of Part 1 is applicab
41、le, except 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 g
42、ive the operator 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 Par
43、t 1 is applicable.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 -18 Abnormal operation
44、This 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 ConstructionThis clause of Part 1 is applicable, except as follows:21.18.1 Addition: Tools with a
45、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 is produced. 22 Internal wiringThis clause of Part 1 is applicable.23 ComponentsThis clau
46、se 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 -26 Provision for earthingThis clause of Part 1 is applicable.27 Screw
47、s and connectionsThis clause of Part 1 is applicable.28 Creepage distances, clearances and distances through insulationThis clause of Part 1 is applicable.29 Resistance to heat, fire and trackingThis clause of Part 1 is applicable.30 Resistance to rustingThis clause of Part 1 is applicable.31 Radiat
48、ion, toxicity and similar hazardsThis clause of Part 1 is applicable.Figure Z101 - Positions of transducers for band saws BS EN 60745-2-20:2009EN 60745-2-20:2009 (E) - 10 -AnnexesThe annexes of Part 1 are applicable except as follows.Annex K (normative) Battery tools and battery packs K.1 Addition:
49、All clauses of this Part 2 apply unless otherwise specified in this annex. K.8.12.1.1 Replacement of this subclause of Part 2: Hold power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring. Cutting accessories contacting a “live“ wire may make exposed metal parts of the power tool “live“ and could give the operator an electric shock. Annex L (normative) Battery tools and battery packs provided with mains connection or non-isolated sources L.1 Addition: Al
