UL-987-BULLETINS-2006.pdf
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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 987 October 20, 2006 SUMMARY OF TOPICS The following changes in requirements are being proposed: (1) For Preliminary Review Only: Addition of construction, marking, and test requirements for motor-operated panel saws (2) For Preli
2、minary Review Only: Addition of construction, marking, and test requirements for motor-operated, or magnetically driven stationary or fi xed tools powered by rechargeable battery, and the battery packs for such tools (3) For Preliminary Review Only: Revision of table saw guarding requirements to add
3、ress variations in blade guard constructions (4) For Preliminary Review Only: Revision of riving knife, riving knife/spreader combination, and antikickback device requirements to specify additional force criteria to be applied for testing saws having different blade diameters, to specify that the sp
4、acing between the tips of the saw blade and riving knife shall be a linear measurement to determine the rigidity of the riving knife and its holder, and to clarify requirements for the body thickness of a riving knife (5) For Preliminary Review Only: Revision of requirements for a blade guard, rivin
5、g knife, spreader, riving knife/spreader combination unit, or antikickback device intended to allow for the quick and simple installation, adjustment, and removal of the devices (6) For Preliminary Review Only: Revision to specify that requirements requiring the construction of a guard or antikickba
6、ck device attached to a spreader or riving knife/spreader combination unit be such that no new risk of injury is introduced if sawing material thicker than the blade height above the table is attempted (7) For Preliminary Review Only: Revisions to allow easier adjustment or removal of antikickback d
7、evices in order to reduce the need for adjustment or removal of a spreader or riving knife/spreader combination unit (8) For Preliminary Review Only: Revisions to specify that an antikickback device(s) shall not be permanently deformed after testing (9) For Preliminary Review Only: Revisions to clar
8、ify that, for table saws with open bottom construction, the saw blade and the moving parts of the blade drive mechanism shall be guarded to reduce the risk of the user unintentionally contacting these parts (10) For Preliminary Review Only: Addition of compliance criteria to specify the means for me
9、asuring the blade recess for open bottom table saw constructions and for determining the acceptability of any of the openings at the bottom perimeter of the unit with respect to moving parts Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State U
10、niversity/5618801100 Not for Resale, 01/22/2007 19:57:55 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION (11) For Preliminary Review Only: Revision to specify that a sheet-metal screw shall not be used as a means
11、 to secure equipment-grounding conductors (12) For Preliminary Review Only: Addition of requirements applicable to lasers that are integral to table saw constructions (13) For Preliminary Review Only: Editorial changes to update standardized wording, clarify requirements, and to update incorrect ref
12、erences COMMENTS DUE: December 5, 2006 For your convenience in review, proposed additions to existing requirements are shown underlined and proposed deletions are shown lined-out. (1) For Preliminary Review Only: Addition of construction, marking, and test requirements for motor-operated panel saws
13、BACKGROUND This proposal is for review and comment only (no ballot at this time). Please note that comments on a preliminary review document will not receive a response from the proposal author through CSDS. Instead, the proposal author is asked to review the comments received during the preliminary
14、 review and adjust the proposals and/or supporting rationale as the author determines to be appropriate. The preliminary review process is an informal mechanism that provides authors with the opportunity to refi ne their proposals before the proposals advance in ULs standards development process. No
15、rmally, the next step in the process is the more formal STP ballot and stakeholder review process. Only comments newly posted during the more formal STP ballot and stakeholder review process will be addressed and responded to. RATIONALE Proposal Submitted By: John Stimitz, UL Panel saws are presentl
16、y investigated to general requirements throughout UL 987 and to other requirements as needed. Users of the standard have requested that the requirements applicable to panel saws be clarifi ed and grouped together in one section of the standard. The addition of Paragraph 12.1.4.2 and Section 45B is p
17、roposed to provide one location for all of the requirements applicable to panel saws. The proposed requirements include new requirements and clarifi cation of existing requirements. PROPOSALS 12.1.4.2 Flexible supply cords used with panel saws shall be rated for extra hard service conditions. Interc
18、onnecting cords shall be at least one of the types specifi ed in 12.1.4. 45B Panel Saws 45B.1 These requirements cover panel saws that utilize circular saw blades powered by a motor unit that is mounted to a movable carriage. OCTOBER 20, 2006SUBJECT 987-2- Copyright Underwriters Laboratories Inc. Pr
19、ovided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 01/22/2007 19:57:55 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 45B.2 A saw blade shall be furnished with
20、 a panel saw. 45B.3 The blade stop time shall be 15 sec or less for blades less than 10 in (254 mm) in diameter. For larger blades, one additional second of stop time is allowed for each additional 1 in (25.4 mm) increment of blade diameter. 45B.4 To determine compliance with 45B.3, the saw is to be
21、 operated at no load and at rated voltage for a period of 15 min prior to the test. The saw is then to be cycled on and off 10 times, with a 30 second period between the blade stopping and the next actuation. For each cycle, the blade shall come to a complete stop in the time specifi ed in 45B.3. 45
22、B.5 For a panel saw, a vertical cut is defi ned as a cut made by moving the carriage from the top position down through the work piece. A horizontal cut is defi ned as a cut where the carriage is locked in place and adjusted with the blade horizontal so that work piece is fed into the blade. 45B.6 A
23、 movable carriage shall be constructed so that it moves freely and smoothly without undue jerking between any positions with all adjustments to the least favorable setting. The carriage shall automatically return to the original position after a vertical cut is complete. 45B.7 The carriage return me
24、chanism shall be constructed so that it withstands the stresses it may be subjected to in normal use and shall comply with 45B.8. The return mechanism shall be capable of preventing the carriage from free falling during a vertical cut and the maximum force required to move the carriage system vertic
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