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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Subject 248-1 (248-2, 248-3, 248-4, 248-5, 248-6, 248-7, 248-8, 248-9, 248-11, 248-12, 248-13, 248-14, 248-15) (In reply, refer to Subject 248-1) 12 Laboratory Drive Research Triangle Park, NC
2、27709 May 5, 2005 TO:Standards Technical Panel (STP) for Fuses and Fuseholders, STP 248; Subscribers to ULs Standards Service for Low-Voltage Fuses General Requirements, UL 248-1 Low-Voltage Fuses Class C Fuses, UL 248-2 Low-Voltage Fuses Class CA and CB Fuses, UL 248-3 Low-Voltage Fuses Class CC Fu
3、ses, UL 248-4 Low-Voltage Fuses Class G Fuses, UL 248-5 Low-Voltage Fuses Class H Non-Renewable Fuses, UL 248-6 Low-Voltage Fuses Class H Renewable Fuses, UL 248-7 Low-Voltage Fuses Class J Fuses, UL 248-8 Low-Voltage Fuses Class K Fuses, UL 248-9 Low-Voltage Fuses Plug Fuses, UL 248-11 Low-Voltage
4、Fuses Class R Fuses, UL 248-12 Low-Voltage Fuses Semiconductor Fuses, UL 248-13 Low-Voltage Fuses Supplemental Fuses, UL 248-14 Low-Voltage Fuses Class T Fuses, UL 248-15 Other Interested Parties SUBJECT:Comments and Substantive Changes received on the ANSI Ballot of November 4, 2004, Proposed Requi
5、rements for the Second Edition of the Standard for Low- Voltage Fuses, UL 248: Parts 1-9 and Parts 11-15; SUMMARY OF TOPICS This bulletin proposes the following changes in requirements: The attached comment matrix documents the comments received on the November 4, 2004 proposal bulletin and the resp
6、onses to these comments. Revisions to proposed requirements based upon these comments are attached to this bulletin. COMMENTS DUE: June 2, 2005 The attached comment matrix provides the proposed comment dispositions from the balloting of the proposal bulletin dated November 4, 2004. The ballots were
7、due to the Project Manager by December 6, 2004. The matrix contains all of the comments that were received. The effective dates are the same as stated in the proposal bulletin dated November 4, 2004 unless noted otherwise. UL has determined that consensus has been achieved regarding the ANSI approva
8、l of the proposed revisions to UL 248. The initial consensus count for UL 248 Part 1 is 8 yes, 0 no, and 0 abstain. The initial consensus counts for UL 248, Parts 2, 3, 4, 5, 6, 8, 9, 12, and 13 are 6 yes, 1 no, and 1 abstain. The initial consensus counts for UL 248, Parts 7, 11, and 15 are 7 yes, 0
9、 no, and 1 abstain. The initial consensus count for UL 248, Part 14 is 7 yes, 1 no, and 0 abstain. If you wish to change your vote in light of the dispositions/actions or the proposed changes, please respond to us in writing by June 2, 2005. If we do not hear from you by this date, your original vot
10、e will be maintained. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 MDTNo reproduction or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
11、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL If the STP concurs with the dispositions/actions, UL plans to adopt the revised versions of UL 248 Parts 1-9 and 11-15 as ANSI standards. Anyone who has submitted an objection has the right to appeal this action on a procedural basis throug
12、h ULs Appeals Process. If you wish to appeal, please respond by June 2, 2005. Please note only appeals based on a procedural issue will be heard, technical issues should be resolved at the consensus body level. Guidelines on how to register an appeal can be obtained on http:/ or by contacting the S
13、TP Project Manager. UL appreciates the time and effort you have put forth to review this standard, and looks forward to your continued participation in this UL/ANSI standard activity. UNDERWRITERS LABORATORIES INC. PATTI VAN LAEKE Project Manager for STP 248 Standards Department Phone: (919) 549-172
14、3 Fax: (919) 547-6172 E-mail: http:/ REVIEWED BY: BRADLEY J. SCHMIDT Chair for STP 248 Global Standards Phone: (847) 664-3064 Email: Copyright 2005 Underwriters Laboratories Inc. SR:PVL bul-248.2_20050425 Attachments: Appendix A Comment Resolution Matrix - General Information and Defi nitions Appe
15、ndix B Comment Resolution Matrix Appendix C Proposed Changes to the requirements in the November 4, 2004 Bulletin MAY 5, 2005SUBJECT 248-1-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 M
16、DTNo reproduction or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX A COMMENTS RESOLUTION MATRIX General Information and Defi nitions The Comment Resolution Matrix provides the co
17、mment dispositions from the Ballot of BSR/UL 248, Parts 1-9 and 11-15, proposal bulletin dated November 4, 2004. The Standard for Low-Voltage Fuses. STP Project Manager: Patti Van Laeke, Phone: (919) 549-1723, E-mail: STP Chair: Bradley J. Schmidt, Phone: (847) 664-3064, E-mail: Description of Pro
18、posal: The columns in the comment resolution matrix can be defi ned as follows: Comment SubmitterName of person who submitted comment. Para. # / Text Ref. Indicates the specifi c reference for the comment CommentThis comment matrix presents a summary of the comment and the suggested wording of propo
19、sals. ActionThe action, such as accepted or disagree, and the justifi cation for the action, if needed. DispositionThe proposed disposition such as resolved or unresolved. MAY 5, 2005SUBJECT 248-1-A1- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwe
20、stern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 MDTNo reproduction or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX B Subject or Topic: Comment Resolution bulletin for
21、UL 248, the Standard for Low-Voltage Fuses, Parts 1-9 and 11-15, comments received form the proposal bulletin dated November 4, 2004. Comment Submitter Paragraph / Text Reference Comment or Comment SummaryAction/Disposition Hiroo ArikawaPage A2, Preferred symbols It is thought that IEC 417 No. 5032-
22、a, IEC 417 No. 5031-a and IEC 417 No. 5033-a should be IEC 60417 No. 5032, IEC 60417 No. 5031 and IEC 60417 No 5033 respectively. Please check with IEC 60417-1, 3rd edition 2002-5, Graphical symbols for use on equipment Part 1: Overview and application. Accepted. The Standard will be amended accordi
23、ngly. UL-STP Member Hiroo ArikawaPage A15, sub- clause 6.1, Marking of fuses In UL 248 Series, the symbol “V” is used for volts, so it is thought that “125 volts” should be “125 V” (2 places) Accepted. The Standard will be amended accordingly. UL-STP Member Hiroo ArikawaPage A16, the last two senten
24、ces in sub-clause 8.4 Verifi cation of operation at rated voltage It is not clear that the phrase “For other than surface mounted fuses” should be also applied to the last sentence, and some people might interpret that any pinhole is not permitted for surface mounted fuses. Accepted in principle. Th
25、ank you for your suggestion. UL-STP Member Some surface mounted fuses are classifi ed as microfuse and the others are classifi ed as supplemental fuse. Any reason, that a pinhole is not permitted only for surface mounted fuses, cannot be found out and it is thought that a pinhole not exceeding 1.6 m
26、m should be permitted for surface mounted fuses as well. In order to avoid the ambiguity that you have suggested may exist, paragraph 8.4.4 will be amended to read: To avoid the ambiguity and to permit the pinhole for surface mounted fuses, it is proposed for the last two sentences to be substituted
27、 each other and it should be as follows: For fuses with capped ends, a pinhole not exceeding 1.6 mm (0.063 in) is permitted in the fl at portion of each cap. A pinhole not exceeding 1.6 mm (0.063 in) is permitted in the fl at portion of each cap. For other than surface mounted fuses, the fuse shall
28、be readily removable from the fuseholder. The fuse shall be readily removable from the fuseholder. George GregoryItem 10 Removal of body temperatures Item 10 Removal of body temperaturesRejected. Thank you for your comments and for your active participation in the fuse STP process. Let us take the o
29、pportunity to address these comments in the order that youve presented them: MAY 5, 2005SUBJECT 248-1-B1- Table Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 MDTNo re
30、production or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued Comment Submitter Paragraph / Text Reference Comment or Comment SummaryAction/Disposition My vote is negative.
31、The THC takes an unfounded position that, “Body temperature has minimal effect on equipment.” The THC has provided no basis, no test, no fact fi nding study, and no proof that body temperature has no effect on equipment. As a manufacturer of fused equipment, our records demonstrate a major increase
32、in fi eld issues with fused equipment incurring excessive temperature conditions. Removing the body temperature is a reduction of a requirement in a critical area of fuse testing which impacts enclosed equipment without any basis at all. 1. The THC has never taken the position that body temperature
33、has minimal effect on equipment. Naturally, any source of heat contained in a piece of fused equipment will have an effect on that equipment. By their very nature, overcurrent protection devices such as fuses are thermodynamic and, as with any device that creates a voltage drop, the I2R loss that en
34、ables the fuse to operate, will generate heat that ultimately must be dissipated. Further, it is well understood that the mechanical and electrical properties of polymeric materials degrade as a function of time and temperature. The rate of this decline is a dependant upon the specifi c material som
35、e are better, (slow rate of decline, relatively impervious to elevated temperatures) some are worse. MAY 5, 2005SUBJECT 248-1-B2- Table Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/2
36、9/2006 21:58:37 MDTNo reproduction or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued Comment Submitter Paragraph / Text Reference Comment or Comment SummaryAction/Dispositi
37、on Since this proposal comes from the THC, I understand that harmonization is one reason for making this proposal. While I support of the harmonization with Canadian requirements, I want to assure that harmonization does not mean reducing the level of protection. As regards to harmonization with IEC
38、 standards, that move is admirable in direction, however, there are great differences between IEC and UL standards for fused switches such that a fuse rated to IEC standards would not generally apply to North American equipment. Harmonization should not mean reducing the requirement to the least req
39、uirement in order to make them the same. 2. You indicate that no equipment STP has been included in the discussion of this revision. This is true and it is not a common practice. As you know, the STP is a balanced body whose role is, in part, to prepare and process Proposals and Comments to amend ex
40、isting Standards. STP 248 has 4 members that represent manufacturers of fused equipment and, as with all voting members, each has the opportunity to provide comments and vote on Proposals for revision to the 248 series of Standards. Yours are the only negative comments that have been received regard
41、ing the current Proposals. MAY 5, 2005SUBJECT 248-1-B3- Table Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 MDTNo reproduction or networking permitted without license
42、 from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued Comment Submitter Paragraph / Text Reference Comment or Comment SummaryAction/Disposition The application of fuses in fused switches and equipment must be consid
43、ered and at this point no equipment STP has been included in the discussion of this revision. We notice that the bulletin was not sent to manufacturers of fused switches and equipment even though this equipment is where the impact of a change in fuses will appear. The potential for excessive tempera
44、tures in fused equipment is a very serious consideration and should not be overlooked. Imagine, for example, a fused panelboard in which there are a number of fused switches grouped together. A small increase in watts loss for each fuse could cause a signifi cant increase in the operating temperatur
45、e of the panelboard. 3. You conclude, by reference to the fact that UL 1429 requires a measurement of fuse body temperature, that body temperature is not always a function of fuse terminal temperature. Logically, one does not proceed from the other. As noted above, the heat generated by a fuse is a
46、function of the I2R loss that enables the fuse to operate. This loss is developed at the fuse link, which is generating the voltage drop. Since (in a cartridge fuse) the fuse link is contained within the fuse body, no one would argue that one natural point to measure temperature would be the center
47、point of the fuse body. This is not the same as saying that as the fuse body increases in temperature that the fuse terminals will not also increase in temperature or even that the fuse body would represent the highest temperature. MAY 5, 2005SUBJECT 248-1-B4- Table Continued on Next Page Copyright
48、Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/29/2006 21:58:37 MDTNo reproduction or networking permitted without license from IHS -,-,- UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued Comment Submitter Paragraph / Text Reference Com