UL-471-BULLETINS-2004.pdf
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1、Subject 635 (197, 250, 471, 507, 745, 859, 923, 998, 1017, 1026, 1082, 1083, 1240, 1363, 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
2、 Cooking Appliances Commercial Electric Personal Grooming Appliances Commercial Refrigerators 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 Househ
3、old Electric Coffee Makers and Brewing-Type Appliances Household Electric Personal Grooming Appliances Household Electric Skillets and Frying-Type Appliances Household Refrigerators and Freezers Humidifiers Information Technology Equipment Microwave Cooking Appliances Personal Hygiene and Health Car
4、e Appliances Portable Electric Tools Relocatable Power Taps Vacuum Cleaners, Blower Cleaners, 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
5、 This bulletin proposes the following changes in requirements: 1. Revision of the Scope 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
6、, Section 5. 3. Clarify requirements for conditioning strain relief bushings during the 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 Copyright Underwriters Laboratories
7、Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 04:15:38 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 635 -2- SEPTEMBER 27,2004 Attached as Appendix A for your review and comment are proposed require
8、ments for UL 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 an
9、d are for review 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 requireme
10、nts contained 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
11、 let ins. Comments 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 ULs 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
12、 public and 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.
13、 REVIEWED BY: 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) 664-2
14、903 Fax: (847) 313-2903 E-mail: Thomas.L.M Copyright O 2004 Underwriters Laboratories Inc. SR: RKM bul-635.2-20040927 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 04:15:38 MDTNo reproduction or net
15、working permitted without license from IHS -,-,- 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 existing requirements are shown underlined and proposed de
16、letions 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 with wire mesh cord arbs. 2. MATERIALS RATIONALE UL propose
17、s 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 requirements in UL 635. In addition, the proposal would c
18、larify 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 5.4 have been re-designated as Paragraphs 5.1.1, 5.1.2, and
19、 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 Horizontal and Vertical Flame Test Methods, 60695-11-10. P
20、aragraph 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 requirements for materials substitution would appear in the st
21、andard 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 Standard for Positioning Devices, UL 1565. UL determined that S
22、tandard 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 of insulated wires. PROPOSAL (CURRENT VERSION OF SECTION 5
23、) Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 04:15:38 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 635 -A3- SEPTEMBER 27,2004 5 Materials 5.1 Ceramic material
24、s 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 bushing is not less than 3/64 inch (1.2 mm) thick, and when it is formed and secured in place so
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