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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
25、ally shall be 11.2 lbs (50 N). 45B.8 Without energizing the unit, the carriage shall be moved from the maximum vertical up position to the fi nished vertical down position for a total of 6,000 cycles, with each downward motion counting as one cycle. Following the test, there shall be no loosening of
26、 parts and the cable shall show no signs of breakage or fraying and the carriage is able to return to within 1 in (25 mm) of the starting maximum vertical up position. If a guard is provided with a connecting means for an exhaust hose, the hose is to be connected during the test and shall remain int
27、act at the conclusion of the test. See 45B.21. 45B.9 Counterbalances or weights that utilize cables and fi ttings shall be suitable for the stresses that they may be subjected to in normal use. Cables shall be suitable for the expected load and employ a double crimped, or equivalent, connection. Cab
28、les shall be arranged in such a way to reduce the likelihood of entanglement and routed such that they are not subjected to abrasions. A hole in the enclosure through which a cable passes shall be a smooth, rounded bushing or shall have a smooth, rounded surface upon which the cable bears. 45B.10 A
29、panel saw shall only be capable of making a downward vertical cut. Limitations shall be provided to prevent the saw blade from being adjusted so it is capable of cutting in an upward motion. 45B.11 The movable carriage shall be provided with an operating handle positioned so that it does not interfe
30、re with stationary parts of the panel saw. The control switch shall be located in the area of the operating handle. 45B.12 A panel saw that allows for both a vertical cut and a horizontal cut that involve multiple positions while being operated normally shall not create additional risk of injury fro
31、m loss of control of the work piece or power head. For a carriage that is capable of adjusting the saw blade to more than one position, the maximum force required to turn the carriage system shall be 22.5 lbs (100 N). OCTOBER 20, 2006SUBJECT 987-3- Copyright Underwriters Laboratories Inc. Provided b
32、y 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.13 The arbor of a panel saw shall be readily
33、accessible to perform required maintenance on the blade. 45B.14 The arbor shall have a nominal diameter not less than 1/2 in (12.7 mm) for the blade having a diameter less than 8 in (203 mm), and not less than 5/8 in (15.9 mm) for a blade having a diameter of 8 in (203 mm) or greater. 45B.15 The thr
34、ead for the blade-retaining nut shall have such a direction that the nut is tightened by being rotated in the direction opposite to the normal rotation of the blade. 45B.16 A saw-blade supporting collar shall not be less than 1-3/8 in (34. 9 mm) in diameter for a 7 in (178 mm) diameter blade, and th
35、e diameter shall be increased at least 1/8 in (3.2 mm) for each 1 in (25.4 mm) increase in blade diameter. 45B.17 A panel saw shall be so guarded as to minimize the risk of accidental contact with the rotating blade, as far as conditions of use will permit. 45B.18 Guarding above the carriage shall e
36、nclose the cutting edge zone. See 2.6. The supporting platen for the carriage may be considered a barrier to direct contact with the cutting edge zone. The probe illustrated in Figure 7.1 shall not contact the cutting edge zone or other moving parts of the blade drive mechanism when moved along the
37、edge of the platen with the probe stop plate in contact with the platen edge. The probe fi nger may be manipulated at the joints to ensure contact with the blade is not possible when the carriage is located in each applicable cutting position from the top side of the platen and areas surrounding the
38、 blade guard and power head. 45B.19 A guard(s) shall be constructed to so that the saw blade can be removed without difficulty. If the arbor is accessible with the guard in its intended position, the guard shall be retained in such a way that removal of its parts will require the use of tools. If th
39、e guard totally encloses the arbor, the guard may be retained by use of fasteners that do not require the use of a tool to remove, such as thumb screws. If tools are not necessary for guard removal, the marking specifi ed in 70.16.6 shall be provided. 45B.20 All openings provided in the guard for th
40、e purpose of ejection or collection of dust shall direct the dust discharge away from the operator and: a) be located beyond the outer circumference of the blade; or b) not allow contact with the blade when applying a 1/2 in (12.7) diameter probe when inserted 2-1/2 in (63.5 mm) into the opening. 45
41、B.21 A guard may be provided with means for connecting an exhaust hose. If connections are provided, the exhaust hose shall be able to be fi rmly attached to the connection, shall move freely when the carriage system is moved in any direction, and shall not contact moving parts or create a risk of i
42、njury to the user. See 45B.8. 45B.22 The area directly behind the power head shall be guarded against direct contact with the blade. The probe illustrated in Figure 7.1 is applied along the edges of the barrier with the probe stop plate in contact with the edges of the barrier. The probe fi nger may
43、 be manipulated at the joints to ensure contact with the blade is not possible when the power head is located in each applicable cutting position. OCTOBER 20, 2006SUBJECT 987-4- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/561
44、8801100 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.23 The distance between the power head carriage assembly and the work support shall not exceed the blade depth. 45B.
45、24 Switches intended to energize the tool shall be protected against accidental activation and comply with the requirements outlined in Switches and Controls, Sections 18 and 31. 45B.25 The angle between the work piece and the vertical position shall be a minimum of 5. The panel saw shall be stable
46、and shall comply with the applicable stability test specifi ed in 29.2 29.4 and the requirements specifi ed in 45B.26 or 45B.27. 45B.26 A panel saw that is not likely to be secured to a permanent structure shall be subjected to a pull test. A force equal to 1/5 of the total weight of the panel saw s
47、hall be applied 5 ft (152 cm) above the base of the unit at any point along the panel saw structure that would allow it to become less stable. Following the application of the force, the panel saw shall remain upright without tipping over or having parts become displaced from the saw structure. 45B.
48、27 A panel saw intended for wall mounting is to be subjected to a loading test. The panel saw is to be mounted to a test wall in accordance with the manufacturers installation instructions. When the instructions do not specify minimum acceptable wall conditions, the test wall is to be constructed of
49、 3/8-in (9.5-mm) thick plasterboard (dry wall), mounted on nominal 2 by 4 in (38 by 89 mm) wood studs spaced on 16 in (406 mm) centers. The panel saw is to be fastened between the studs and secured into the plasterboard. A test load equal to four times the normal maximum load, but not less than 300 lbs (136 kg), is to be gradually applied to the panel saw, horizontally through the center of the support bracke