1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60745-2-3Hand-Held Motor-Operated Electric Tools - Safety - Part 2-3: Particular Requirements forGrinders, Polishers and Disk-Type SandersUL COPYRIGHTED MATERIAL NOT AU
2、THORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60745-2-3Hand-Held Motor-Operated Electric Tools - Safety - Part 2-3: Particular Requirements for Grinders,Polishers and Disk-Type SandersEdition: 2Edition Date: May 31, 2007The revisions dated Sept
3、ember 20, 2013 were issued to incorporate the following revisedrequirements and to reflect the latest ANSI approval date of September 20, 2013:1. Proposed Revisions To Align Amendments No. 1 And No. 2 For IEC 60745-2-3, SecondEdition And Proposed National Differences To The IEC TextUL 60745-2-3 is a
4、n adoption of IEC 60745-2-3, Hand-Held Motor-Operated Electric Tools Safety Part 2-3: Particular Requirements for Grinders, Polishers, and Disk-Type Sanders, SecondEdition, issued February 2006. The revision pages adopt IEC 60745-2-3, Amendments No. 1 andNo. 2 incorporated into IEC edition 2.2 and i
5、ssued July 2012. Please note that the nationaldifference document incorporates all of the U.S. national differences for UL 60745-2-3.This document provides a single listing of the National Differences included in the UL adoption ofthe corresponding IEC standard.All rights reserved. No part of this p
6、ublication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.UL provides this standards document as is without warranty of any kind, either expressed or implied,including
7、 but not limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or the
8、inability to use this standards document, even if UL or an authorized UL representative has been advisedof the possibility of such damage. In no event shall ULs liability for any damage ever exceed the pricepaid for this standards document, regardless of the form of the claim.Users of the electronic
9、 versions of ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonableattorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on th
10、e purchasers computer system.Copyright Underwriters Laboratories Inc.SEPTEMBER 20, 2013NATIONAL DIFFERENCES FOR UL UL 60745-2-32UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPrefaceThis document provides a single listing of the technical Nat
11、ional Differences included in the UL adoptionof the corresponding IEC standard.In its IEC-based standards, UL uses the notations indicated below to identify national difference type, andthese types are additionally noted in this document. The standard may not use all types of thesedeviations.D1 - Th
12、ese are deviations which are based on basic safety principles and requirements, elimination ofwhich would compromise safety for U.S. consumers and users of products.D2 - These are deviations based on safety practices. These are deviations for IEC requirements that maybe acceptable, but adopting the
13、IEC requirements would require considerable retesting or redesign on themanufacturers part.DC - These are deviations based on the component standards and will not be deleted until a particularcomponent standard is harmonized with the IEC component standard.DE - These are deviations based on editoria
14、l comments or corrections.DR - These are deviations based on the national regulatory requirements.Each national difference contains a description of what the national difference entails. Typically one of thefollowing words is used to explain how the text of the national difference is to be applied t
15、o the base IECtext:Addition / Add - An addition entails adding a complete new numbered clause, subclause, table,figure, or annex. Addition is not meant to include adding select words to the base IEC text.Deletion / Delete - A deletion entails complete deletion of an entire numbered clause, subclause
16、,table, figure, or annex without any replacement text.Modification / Modify - A modification is an altering of the existing base IEC text such as theaddition, replacement or deletion of certain words or the replacement of an entire clause,subclause, table, figure, or annex of the base IEC text.SEPTE
17、MBER 20, 2013 NATIONAL DIFFERENCES FOR UL UL 60745-2-3 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences3.103.6DV D2 Addition: Add the following definition to Clause 3 of the Part 2:ADAPTOR BACKING FLANGE: backing flange wh
18、ich contacts and supports in the hubarea and extends past the raised portion to reduce the flexing of the wheel periphery8.1DV D1 Modification: Add the following to Clause 8.1 of this Part 2: WARNING To reduce the risk of injury, use only accessories rated at leastequal to the maximum speed marked o
19、n the tool.All GRINDERS required to have a guard by Clause 19.101 shall be marked with the followingwarning: WARNING To reduce the risk of injury, always use proper guards whengrinding.If the above cautionary markings are included as part of a list of cautionary markings, thewords WARNING To reduce
20、the risk of injury need not be repeated.19.101DV D2 Modification: Replace the first item of paragraph 3 of Clause 19.101 of thePart 2 with the following: be designed so that, in case of a wheel burst, the guard reduces the risk of injury to theoperator and complies with the test of 20.101;19.104.3DV
21、 D2 Addition: Add Clause 19.104.3DV to the Part 2:An ADAPTOR BACKING FLANGE may be used in place of the backing flange to mount WHEEL TYPES27, 28 and 29 with a diameter greater than 155 mm. The adaptor backing ADAPTOR BACKINGFLANGE shall extend beyond the central hub, or raised portion, of the wheel
22、. The adaptorsare exempt from the flange strength test specified in 19.105.20.5DV D2 Deletion: Delete Clause 20.5 of the Part 2:This clause is not applicable.20.101.1DV D2 Modification: Delete the last two paragraphs of Clause 20.101.1 of thePart 2:The requirements in the last two paragraphs do not
23、apply.20.101.2DV D2 Modification: Replace Clause 20.101.2 of the Part 2 with the following:The maximum thickness grinding wheel recommended by the manufacturer with adiameter equal to the rated capacity of the grinder shall be notched into four equalsegments (quadrants). The width of each notch shal
24、l not exceed 2,5 mm. For WHEEL TYPES 1,SEPTEMBER 20, 2013NATIONAL DIFFERENCES FOR UL UL 60745-2-34UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL27, 28, 29, 41 and 42, the cut is directed from the outer edge radially towards the center(see Fi
25、gure 107). For WHEEL TYPES 6 and Type 11, the cut starts across the working surfacetowards the mounting end (see Figure 108).The notched grinding wheel is mounted to the spindle with any mounting means that willallow for the centrifugal forces to cause the wheel to disintegrate. The mounting meanssh
26、all position the wheel at the same location relative to the guard as would occur with theflange recommended in accordance with the instructions in 8.12.2b).20.101.4DV D2 Modification: Replace Clause 20.101.4 of the Part 2 with the following:While monitoring the wheel speed with a tachometer, the vol
27、tage to the tool is graduallyincreased until the higher of the speeds established in 19.6 or 90 % of the RATED SPEED of thegrinder is achieved. If the wheel does not disintegrate at this specified speed, at themanufacturers option: either continue further increasing the speed; or stop the grinder, i
28、ncrease the length of the pre-cuts and repeat the test aboveuntil the wheel bursts at or above the speed specified in this clause.20.101.5DV D2 Modification: Replace Clause 20.101.5 of the Part 2 with the following:The wheel guard has met the requirements of 20.101 if the following results have been
29、achieved:a) the wheel burst speed was at or higher than required by first paragraph of20.101.4;b) the guard and the fasteners or the guards mounting hardware shall remain inplace. Deformation, hairline cracks or scratches and gouges to the guard andmounting hardware are acceptable;c) the guard shall
30、 not have rotated in the direction of the wheel rotation by morethan 90 (see Figures 106A) and 106B). If the guard covers 360 of the wheelsperiphery, the 90 limitation on the guards rotation is not applicable;d) the impression of the impact in the clay wall from the major segments shall bewithin the
31、 fragment zone. There shall be no major fragments or impressions offragments outside the fragment zone (the operator zone). The fragment zone isdefined by extending a straight line through the midpoints of the two sidehandles onto the clay wall facing the unguarded wheel in the position of thegrinde
32、r just prior to the wheel bursting (see Figure 110A). After the wheelsdisintegration, most of the four major wheel segments will be captured by theclay wall. If any of the major segments rebound from the clay, the segmentsimpression must be identified. Dust, minor fragments and segments remaining in
33、the guard are ignored.If the wheel guard has failed any of the b) d) requirements at the wheel burst speed thatwas above the speed specified by the first paragraph of 20.101.4, the test shall be repeatedwith the increased length of segment pre-cuts.SEPTEMBER 20, 2013 NATIONAL DIFFERENCES FOR UL UL 6
34、0745-2-3 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL103DV DE Modification: Replace Footnote 2) with the following:IEC 60745-2-22, Edition 1, was published in March 2011. The harmonized UL and CSAversion of IEC 60745-2-22, Edition 1, has
35、also been published and includes North Americannational differences.104DV DE Modification: Replace Footnote 3) with the following:IEC 60745-2-23, Edition 1, was published in December 2012. The harmonized UL and CSAversion of IEC 60745-2-23, Edition 1, has also been published and includes North Americannational differences.”SEPTEMBER 20, 2013NATIONAL DIFFERENCES FOR UL UL 60745-2-36
