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1、Subjects 197 (in reply, refer to Subject 197) 12 Laboratory Drive Research Triangle Park, NC 27709 December 1, 2004 TO: Standards Technical Panel of UL for Commercial Cooking Appliances, STP 197; Subscribers to ULs Standards Service for Commercial Electric Cooking Appliances, Subscribers to ULs List
2、ing Service for KNGT, Commercial Cooking Appliances UL 197; and SUBJECT: PROPOSED CHANGE OF EFFECTIVE DATE for the Ninth Edition of the Standard for Commercial Electric Cooking Appliances, UL 197 Summary of Topics UL proposes to postpone the effective date for UL 197 from March 26,2005 to March 26,
3、2006. COMMENTS DUE: January 4,2005 PROPOSED POSTPONEMENT OF EFFECTIVE DATE An industry review notice dated September 5, 2003 was distributed to the Subscribers of ULs Listing Service for category KNGT, Commercial Cooking Appliances, regarding the new and revised requirements in UL 197, effective Mar
4、ch 26, 2005. Due to the concerns expressed by a significant representation of the manufacturing community regarding the amount of time needed to establish compliance with the new requirements together with the nature of the new requirements, UL proposes to postpone the Effective Date from March 26,
5、2005 to March 26, 2006. The effective date is not part of the ANSI Standard. Therefore no ballot of this proposal bulletin will occur. REQUEST FOR COMMENTS Please provide your comments on the proposed change of effective date. Written comments should be sent by regular mail, fax, or e-mail to the at
6、tention of Rick Rynkiewicz at ULs Northbrook Office. Please reference all correspondence to Subject 197. If you respond by fax or e-mail, please include your full name and company address to ensure a reply. Please note that comments may be made public. All comments should be sent by January 4, 2005.
7、 Since effective dates are not subject to letter ballot, a separate ballot on this topic will not be distributed to STP representatives. Questions regarding interpretation of requirements should be directed to the responsible UL Staff. Unless specifically requested to do so, UL will not acknowledge
8、comments indicating concurrence with this proposal. SUBJECT 197 -2- DECEMBER 1,2004 Thank you in advance for your communication on this topic. UNDERWRITERS LABORATORIES INC. REVIEWED BY: RICK RYNKIEWICZ LENORE BERMAN Principal Engineer (PDE) - Cooking Appliances PDE Division PDE Division NORTHBROOK
9、OFFICE Phone: (847) 664-2631 E-mail: Richard.P.R E-mail: Lenore.J.Bermanus.uI.com PDE Manager NORTH BROOK OFF ICE Phone: (847) 664-2848 Copyright O 2004 Underwriters Laboratories Inc. SR:JH/SB bl-I 97.9-20041 129 Subject 635 (197, 250, 471, 507, 745, 859, 923, 998, 1017, 1026, 1082, 1083, 1240, 1363
10、, 1431, 1727, 2157, 2158, and 60950) (in reply, refer to Subject 635) TO: 1655 Scott Blvd. Santa Clara, CA 95050 September 27, 2004 Subscribers to ULs Standards Services for Insulating Bushings Commercial Electric Cooking Appliances Commercial Electric Personal Grooming Appliances Commercial Refrige
11、rators and Freezers Electric Clothes Dryers Electric Clothes Washing Machines and Extractors Electric Commercial Clothes Drying Equipment Electric Fans Electric Household Cooking and Food Serving Appliances Household Electric Coffee Makers and Brewing-Type Appliances Household Electric Personal Groo
12、ming Appliances Household Electric Skillets and Frying-Type Appliances Household Refrigerators and Freezers Humidifiers Information Technology Equipment Microwave Cooking Appliances Personal Hygiene and Health Care Appliances Portable Electric Tools Relocatable Power Taps Vacuum Cleaners, Blower Cle
13、aners, and Household Floor Finishing Machines SUBJECT: Request for Comments on Proposed Requirements for the Second Edition of the Standard for Insulating Bushings, UL 635 PROPOSED EFFECTIVE DATE SUMMARY OF TOPICS This bulletin proposes the following changes in requirements: 1. Revision of the Scope
14、 by listing additional products that are not covered by the requirements of UL 635 2. Addition of requirements for flammability, temperature ratings, materials substitution, and molding considerations to Materials, Section 5. 3. Clarify requirements for conditioning strain relief bushings during the
15、 Strain Relief Test. 4. Clarify the requirements for the Humidity Test. 5. Clarify the requirements for conducting the Elevated Temperature Test. COMMENTS DUE: November 22,2004 -,-,- SUBJECT 635 -2- SEPTEMBER 27,2004 Attached as Appendix A for your review and comment are proposed requirements for UL
16、 635. Attached as Appendix B for your review and comment are the impact statements and proposed effective date. Questions regarding interpretation of requirements should be directed to the responsible UL Staff. Please note that proposed requirements are of a tentative and early nature and are for re
17、view and comment only. Current requirements are to be used to judge a product until these requirements are published in final form. PRODUCTSANDINDUSTRIESAFFECTED BYTHE PROPOSAL UL requests your assistance in identifying other products or industries that might be affected by the requirements containe
18、d in this bulletin. UL suggests that all suppliers or customers for these products and industries be made aware of these requirements prior to their proposed effective date. Also, please forward your suggestions to UL so that these products and industries may be identified in future bu I let ins. Co
19、mments should be made in writing and may be sent by fax to (408) 556-6045 or by mail to the attention of Derrick L. C. Martin at UL?s Santa Clara office. Comments may also be sent via E-mail to Derrick.L.M. Please reference all correspondence to Subject 635. Note all comments received are public and
20、 may be circulated to others. If you respond by fax or E-mail, please include your full name and company name and address to ensure a reply. Unless specifically requested to do so, UL will not acknowledge comments indicating concurrence with these proposals. UNDERWRITERS LABORATORIES INC. REVIEWED B
21、Y: DERRICK L. C. MARTIN Project Manager Engineering Associate Standards Department SANTA CLARA OFFICE Phone: (408) 876-2565 Fax: (408) 556-6045 E-mail: Derrick.L.M http:/ TOM MAYERHOFER Principal Engineer - Electrical Insulation Systems and Materials NORTH BROOK OFF ICE Phone: (847) 664-2903 Fax: (8
22、47) 313-2903 E-mail: Thomas.L.M Copyright O 2004 Underwriters Laboratories Inc. SR: RKM bul-635.2-20040927 SUBJECT 635 -Al- SEPTEMBER 27,2004 APPENDIX A PROPOSED REQUIREMENTS FOR THE SECOND EDITION OF THE STANDARD FOR INSULATING BUSHINGS, UL 635 For your convenience in review, proposed additions to
23、existing requirements are shown underlined and proposed deletions are shown +me - 2. Insulatina bus hinas; - 3. Liauid-tiaht flexible cord fittinas; 0 Mesh arbs; - 5. Strain relief arbs; 6 Strain relief arbs for bus d rot) cab les; - 7. Strain relief arbs for flexible cords: and - 8. Strain relief w
24、ith wire mesh cord arbs. 2. MATERIALS RATIONALE UL proposes to reorganize the format of Section 5 by adding subsections for requirements for flammability, temperature ratings, materials substitution, and molding considerations. The intent of the proposal is to provide clarity to the current material
25、 requirements in UL 635. In addition, the proposal would clarify the material substitution requirements as well as the extent to which the materials may or may not be modified during the molding process. The proposed revision of Section 5 includes the following changes: 1. Paragraphs 5.1, 5.3, and 5
26、.4 have been re-designated as Paragraphs 5.1.1, 5.1.2, and 5.1.3 respectively. The proposed Paragraphs 5.1 .I, 5.1.2, and 5.1.3 have been transferred to the proposed Subsection 5.1, titled “General.” 2. Paragraph 5.2 has been revised to include a reference to the IEC Standard for Test Flames - 50 W
27、Horizontal and Vertical Flame Test Methods, 60695-11-10. Paragraph 5.2 has been re-designated as Paragraph 5.2.2 and has been transferred to the proposed Subsection 5.2, titled “Flammability.” 3. The proposed temperature rating requirements would appear in UL 635 as Subsection 5.3; the proposed requ
28、irements for materials substitution would appear in the standard as Subsection 5.4, and the proposed requirements for molding considerations would appear in the standard as Subsection 5.5. The proposed requirements in Paragraph 5.2.1 and Subsections 5.3 - 5.5 are based on requirements from the Stand
29、ard for Positioning Devices, UL 1565. UL determined that Standard UL 1565 was the most appropriate source for the proposed requirements because, like bushings, positioning devices are typically made from similar polymeric materials that are mechanically relied upon to maintain the relative position
30、of insulated wires. PROPOSAL (CURRENT VERSION OF SECTION 5) -,-,- SUBJECT 635 -A3- SEPTEMBER 27,2004 5 Materials 5.1 Ceramic materials and some molded compositions such as phenolic and urea formaldehyde are capable of being used as materials for a separate insulating bushing. Vulcanized fiber is not
31、 prohibited from being used when the bushing is not less than 3/64 inch (1.2 mm) thick, and when it is formed and secured in place so that it is not adversely affected by conditions of typical moisture. Other materials, such as nylon, are capable of being used after a suitable investigation. See Hum
32、idity Test, Section 11, and Elevated Temperature Test, Section 12. 5.2 Materials employed in the construction of insulating bushings shall be classified with a flammability rating of at least 94 HB as determined by the Standard for Safety for Tests for Flammability of Plastic Materials for Parts in
33、Devices and Appliances, UL 94. 5.3 Wood, hot-molded shellac, tar compositions, or rubber are not to be used as materials for a separate insulating bushing. 5.4 The wall thickness of an insulating bushing shall not be less than 3/64 inch (1.2 mm) unless a thickness has been determined to be capable o
34、f being used as a result of an investigation (see reference to vulcanized fiber in 5.1). This requirement does not preclude the use of narrow slots or openings in the wall of an insulating bushing when the intended cable, flexible cord, or insulated wire is not capable of being pressed into such slo
35、ts or openings. (PROPOSED VERSION OF SECTION 5) 5 Materials 5.1 General 5.1.1 Ceramic materials and some molded compositions such as phenolic and urea formaldehyde are capable of being used as materials for a separate insulating bushing. Vulcanized fiber is not prohibited from being used when the bu
36、shing is not less than 3/64 inch (1.2 mm) thick, and when it is formed and secured in place so that it is not adversely affected by conditions of typical moisture. Other materials, such as nylon, are capable of being used after a suitable investigation. See Humidity Test, Section 11, and Elevated Te
37、mperature Test, Section 12. 5.1.2 Wood, hot-molded shellac, tar compositions, or rubber shall not to be used as materials for a separate insulating bushing. 5.1.3 The wall thickness of an insulating bushing shall not be less than 3/64 inch (1.2 mm) unless a thickness has been determined to be capabl
38、e of being used as a result of an investigation. See reference to vulcanized fiber in 5.1 .I. This requirement does not preclude the use of narrow slots or openings in the wall of an insulating bushing when the intended cable, flexible cord, or insulated wire is not capable of being pressed into suc
39、h slots or openings. -,-,- SUBJECT 635 -A4- SEPTEMBER 27,2004 5.2 Flammability 5.2.1 Materials employed in the construction of insulating bushings shall be classified with a flammability rating of at least HB as determined by the Standard for Tests for Flammability of Plastic Materials for Parts in
40、Devices and Appliances, UL 94 or IEC 60695-1 1-10, Test Flames - 50 W Horizontal and Vertical Flame Test Methods. 5.3 Temperature Rating 5.3.1 The temperature rating of the device, as indicated in 10.1, 12.3, and 15.4, is to be based on the mechanical-without-impact relative thermal index (RTI - Str
41、ength) of the material used in the device. The relative thermal index shall be determined in accordance with the Standard for Polymeric Materials - Long Term Property Evaluations, UL 746B. Note: The relative thermal index of a material is an indication of the materials ability to retain a particular
42、 property (such as physical or electrical) when exposed to an elevated temperature for an extended period of time. For each material, a number of relative thermal indices are established, each related to a specific property, and specific thickness of the material. 5.3.2 The temperature rating of a p
43、olymeric device shall not exceed the relative thermal index of the material that is selected for the device, in the devices minimum critical thickness. 5.4 Substitution of Materials 5.4.1 Another polymeric material shall be allowed to be substituted in a device having met the requirements of this St
44、andard only when all of the following conditions are met and compliance is determined through appropriate investigation: a) There is an identical generic description (for example: Type 66, 30 percent glass filled, FR type, polyamide). b) Tensile strength of materials, determined in accordance with t
45、he Standard for Polymeric Materials - Short Term Property Evaluations, UL 746A or IS0 527-1, Plastics - Determination of Tensile Properties - Part 1 : General Principles, and IS0 527-2, Plastics - Determination of Tensile Properties - Part 2: Test Conditions for Moulding and Extrusion Plastics, shal
46、l be compared, and shall indicate that the substitute material has a strength of at least 95 percent of that of the original material. The tensile strengths used in this comparison shall be generated by either: 1) A previous investigation or 2) Side-by-side testing of both materials. c) The material
47、s relative thermal indices shall be used for the temperature rating of the device as specified in 5.3.1. -,-,- SUBJECT 635 -A5- SEPTEMBER 27,2004 5.5 Molding Considerations 5.5.1 Except as indicated in (a) and (b), polymeric materials used to mold or fabricate devices covered by this Standard shall
48、be made from materials that are 100 percent virgin and unmodified by the molder: a) Devices made from thermoplastic materials are limited to 25 percent regrind by weight of the same material, unless the results of a separate investigation indicate acceptable performance for the material or the speci
49、fic device. The Standard for Polymeric Materials - Fabricated Parts, UL 746D, includes guidelines to be considered in such a separate investigation. b) Devices covered by this Standard shall be allowed to employ colorants, flame retardants, fillers, mold-release lubricants, color concentrates, dyestuff, chemical blowing agents or