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1、Subject 506 (1561, 1585, 5085) (in reply, refer to Subject 506) 1655 Scott Blvd. Santa Clara, CA 95050-4169 September 17, 2004 TO: Standards Technical Panel of UL for Low Voltage Transformers, STP 506 Subscribers to ULs Standards Service for Class 2 and Class 3 Transformers Dry-Type General Purpose
2、and Power Transformers Specialty Transformers Other Interested Parties SUBJECT: Report of the Joint Meeting of the UL Standards Technical Panel for Low Voltage Transformers and the CSA Technical Committee on Specialty Transformers, CSA C22.2 No. 66 Summary of Topics The following topics were discuss
3、ed at the meeting: 1. Announcements 2. Suggested revisions of the draft CSNUL Standard for Low Voltage Transformers, C22.2 No. 66/UL 5085, and related items 3. Projected schedule of harmonization activities A joint meeting of the Standards Technical Panel of UL for Low Voltage Transformers (STP 506)
4、 and of CSAs Technical Subcommittee on Specialty Transformers, CSA C22.2 No. 66 was held on August 18 and 19, 2004 at ULs Northbrook, Illinois office. The purpose of the meeting was to discuss the draft CSAIUL Standard for Low Voltage Transformers, C22.2 No. 66/UL 5085, and other topics regarding ST
5、P 506 and low voltage transformers. UL will send a copy of the draft CSAIUL Standard for Low Voltage Transformers, C22.2 No. 66/UL 5085, to recipients of this Report on November 14, 2004 for review. Comments should be made in writing and may be sent by fax to (408) 556-6045 or by mail to the attenti
6、on 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 506. If you respond by fax or E-mail, please include your full name and company name and address to ensure a reply. Attached as Appendix A is a li
7、st of those persons who attended the meeting. SUBJECT 506 -2- SEPTEMBER 17,2004 * * * * * * The following report is not intended to be a verbatim transcript of the discussion at the meeting, but is intended to record the significant features of those discussions. 1. ANNOUNCEMENTS 1.1 Call for new me
8、mbers for STP 506 The Chairman informed the meeting attendees that Standards Technical Panel (STP) 506 needed at least one General Interest or User category member on the STP in order to meet the minimum balance requirements needed to summit a document for ANSI certification. The request was prompte
9、d by the current imbalance of the membership on STP 506. The Chairman indicated there were 23 voting members of STP 506: 12 Producers, 9 Users, and 2 representatives of the General interest category. ULs goal for the formation of STPs is that an STP not have more than a third of its membership from
10、one interest category; however, if the desired balance cannot be achieved, in no case shall the STP have more than 50 percent of its membership from one interest category. The Chairman asked the meeting attendees to submit potential candidates for membership for STP 506 to UL. The Chairman also than
11、ked the STP members for their previous efforts which resulted in three new STP members. 1.2 Status of harmonization effort and future of harmonized standard The Chairman noted that the harmonization effort has required an extended period of time and is nearing completion. Representatives of CSA conc
12、urred with this assessment. The Chairman also noted that while UL has been leading this effort, once that harmonized standard is published UL will no longer be acting in the capacity of the documents secretariat. It was suggested that an industry trade organization could fulfill this role, as could
13、an STP member. CSA representative Brian Haydon concurred with this approach. The advantages of placing the harmonized standard on a revision cycle (e.g., 3-year, 5-year, etc.) were also discussed. 2. SUGGESTED REVISIONS OF THE DRAFT CSAIUL STANDARD FOR LOW VOLTAGE TRANSFORMERS, C22.2 NO. 66/UL 5085,
14、 AND RELATED ITEMS Note: References to clauses in this Report are from the draft Standard for Low Voltage Transformers, C22.2 No. 66/UL 5085. Unless otherwise noted, references to the clauses in this Report appear in the draft standard provided with the agenda for the meeting, ULs Subject 506 Bullet
15、in dated July 19, 2004. 2.1 Review of comments of STP member David Bloesch as contained in ULs Subject 506 Bulletin dated July 19, 2004 A detailed review of Mr. Bloeschs comments, contained in Appendix B, item 1 of the July 19, 2004 meeting agenda was conducted. Some of the suggested items were acce
16、pted by the meeting attendees, others were not accepted, and some were modified based on the meeting discussion. One comment from Mr. Bloesch suggested in concept revised time-related current interruption test methods if the current in Clause 28.1.2, Part 3 of the draft standard is interrupted prior
17、 to 1 minute. After considering the information presented, the meeting attendees determined that actual proposed text changes from the commentor were needed to further evaluate the concept presented at the meeting. 2.2 Table for marking requirements -,-,- SUBJECT 506 -3- SEPTEMBER 17,2004 During the
18、 meeting of STP 506 held on December 2 and 3, 2003, a Working Group was formed by the STP Chair to review the format of Table 7, Part 2 of the draft standard, to determine the appropriate locations for the markings specified in that table, and to include additional markings that are currently missin
19、g from the draft standard. It was reported that the Working Group completed the task by creating a table intended to replace the current version of Table 7, Part 2. The draft table was discussed and changes were suggested. The proposed Table 7 with the suggested revisions will be reviewed by CSA and
20、 UL and may appear in the version of the draft standard that will be published on November 14, 2004. 2.3 Proposed alternate test method for the maximum power of not inherently limited transformers During the meeting of STP 506 held on December 2 and 3, 2003, the STP Chair formed a Working Group to r
21、eview and develop an alternate procedure for measuring the maximum power of not inherently limited transformers described in Clause 28.3.1, Part 3 of the draft standard. The Chair of the Working Group, Ken McKinney, completed the task assigned to the group by creating a revised version of Clause 28.
22、 The proposed alternate procedure was discussed, as were written comments made by STP member David Bloesch. In his comments, Mr. Bloesch indicated disagreement with the maximum current portion of the test with respect to the extrapolation methods proposed. Part of the development of the proposed tes
23、t method involved correlating with test approaches used in the Standard for Class 2 Power Units, UL 1310. The meeting attendees determined that at present the existing test methods work well, and that additional revision would require more discussion and consideration than time presently allows. It
24、was suggested that possible development of an alternate test method could be an item for future consideration. 2.4 Scope of the draft standard During the meeting of STP 506 held on December 2 and 3, 2003, the STP Chair formed a Working Group to review and revise the requirements of the Scope of the
25、draft standard to ensure that they provide a comprehensive description of the transformers covered by the document. The Chair of the Working Group, Ken McKinney, sought assistance from the meeting attendees in completing the task assigned to the group. Following a discussion, the meeting attendees c
26、oncluded that the present Scope accurately specifies what is and what is not covered by the draft standard, and that no changes should be made at present. 2.5 Use of encapsulants in Class 2 and Class 3 transformers UL proposed to add Clause 11.4.9 to Part 3 of the draft standard, and to revise Parag
27、raph 21.4 of the Standard for Class 2 and Class 3 Transformers, UL 1585, by allowing the use of encapsulants, epoxy resin, or equivalent material in Class 2 and Class 3 transformers in lieu of compliance with the spacing requirements for those products. UL noted that it considers the terms “encapsul
28、ants,” “potting compound,” and “epoxy resin” to be interchangeable when used in the context of the proposed requirement. SUBJECT 506 -4- SEPTEMBER 17,2004 UL has allowed (and continues to allow) epoxy resin to be used with encapsulated coil constructions for use as Class A (105) insulation without s
29、pecial tests, provided the epoxy is minimum 1/32 inch thick. UL has determined that because coil insulations generally anticipate a maximum operating voltage of 600 V AC, epoxy resin is an acceptable insulation for coils operating at 600 V AC or less. The meeting attendees discussed the proposed tex
30、t and offered suggestions to improve the proposed requirements. The suggested changes to Clause 11.4.9, Part 3 of the draft standard will be reviewed by CSA and UL and may appear in the version of the draft standard that will be published on November 14, 2004. 2.6 Inherently limited versus not inher
31、ently limited Class 2 transformers The meeting attendees discussed what should be considered a limiting impedance (.e. internal resistance of the winding, a resistor, a PTC) during the meeting. UL has determined that a fuse should not be considered a limiting impedance, and that any transformer rely
32、ing on a fuse or any other overcurrent protection device, such as a thermal cutout or similar device, should be classified as not inherently limited. UL also noted that an overcurrent device should be defined as a fuse, thermal protector, and the like instead of as a resistor or PTC. The meeting att
33、endees concurred with ULs suggested definitions and determined that there were no additional comments or further issues to consider on this item. 2.7 Energy efficiency testing in standards The issue of energy efficiency testing in product test standards was briefly discussed in response to a CSA inq
34、uiry. It was determined that the subject should more appropriately be discussed outside of the technical meeting environment by management representatives of the standards operations of CSA and UL. 2.8 Review of comments made by CSA editorial staff Prior to the meeting the CSA editorial staff conduc
35、ted a detailed review of the draft document and suggested editorial changes to be made to the draft standard. The meeting attendees reviewed each comment made by the CSA staff. It was determined that numerous changes to the draft suggested by CSA should be included in the next updated version of the
36、 document. It was also suggested that the Preface of the harmonized document should include a statement indicating why differences exist between the harmonized North American document and the IEC document. The meeting attendees agreed that the statement should appear in Part 1 of the draft standard.
37、 The statement will appear in the version of the standard that will be published on November 14, 2004. 2.9 Other comments received In addition to the named commentors specified in the above-referenced discussions, it should be noted that other written comments were also received prior to the meeting
38、. Some of the comments were in response to previous comments regarding various requirements in the draft standard, and others were original suggestions for changes to the draft standard. All comments received in this manner were addressed even though the persons who submitted them are not named in t
39、his Report. In most instances those comments were, in effect, incorporated into the discussions of the related comment with which they dealt. -,-,- SUBJECT 506 -5- 3. PROJECTED SCHEDULE OF HARMONIZATION ACTIVITIES SEPTEMBER 17,2004 As UL and CSA are working towards a Co-publication of the transforme
40、r standard, both the UL and CSA review processes need to be completed prior to publication. CSA is currently following their review process of this proposed bi-national standard. Comments received from the CSA Technical Committee, ULs STP 506, UL subscribers and other interested parties will be join
41、tly resolved by CSA and UL. Completion of the project and publication of the standard is estimated to occur sometime during the first quarter of 2005. It was reemphasized that the harmonization project for the development of the draft standard has taken considerable time and effort. Therefore, any c
42、omments received on new issues will be addressed after the bi-national standard is published. As noted in Item 1.2 of this Report, harmonization is intended to be an industry-driven activity. Future revisions to the binational standard will be coordinated through a Technical Harmonization Committed
43、(THC). Anyone interested in becoming a member of the THC and helping to lead the direction of future revisions to the transformer standard is invited to state hidher intent. UL will collect proposed changes and share them, along with any outstanding issues remaining at the completion of this project
44、, with the THC for future consideration and coordination with CSA. UNDERWRITERS LABORATORIES INC. REVIEWED BY: CHARLES McCALL Substitute Project Manager Standards Department Northbrook Office Phone: (847) 664-2320 Fax: (847) 313-2320 DERRICK L. C. MARTIN Project Manager for STP 506 Engineering Assoc
45、iate Standards Department SANTA CLARA OFFICE Phone: (408) 876-2565 Fax: (408) 556-6045 E-mail: Derrick.L.M http:/ulstandardsinfonet.uI.com BRADLEY J. SCHMIDT Chair for STP 506 Corporate Standards NORTHBROOK DIVISION Phone: (847) 664-3064 Copyright O 2004 Underwriters Laboratories Inc. SUBJECT 506 SR
46、: RKM bul-506.1220040917 -6- SEPTEMBER 17,2004 -,-,- SUBJECT 506 -Al- SEPTEMBER 17,2004 APPENDIX A ATTENDANCE AT THE AUGUST 18 AND 19,2004 JOINT MEETING OF THE UL STANDARDS TECHNICAL PANEL FOR LOW VOLTAGE TRANSFORMERS, STP 506, AND CSAs TECHNICAL SUBCOMMITTEE ON SPECIALTY TRANSFORMERS, CSA C22.2 NO.
47、 66 CTP and CSA Representatives Joe Ashley Raymond Birley David Bloesch ?ex Brandt Steven Ensign William Fiske Brian Haydon Joseph Hertel William Horvath Derrick Martin (Project Manager of STP 506) Charles McCall (Acting Project Manager for the meeting) Ken McKinney Lanny McMahill Cynthia Nyberg Tho
48、mas Parchim *Dhiru Patel *Mitchell Rhine Victor Scheele Brad Schmidt (Chair of STP 506) *Devendra (Dave) Shah *Andrew Shemo *Carlos Siqueiros *Alan Smith *Robert Spehalski *Albert Walls Keith Williams Eng Yap Invited Guests Sam Masri Jeff Taylor Acme Electric Corp. International Coil Winding Associa
49、tion Tyco Electronics - CII/Products Unlimited Taylor Company Ensign Corp. Intertek Canadian Standards Association State of Wisconsin Basler Electric UL UL UL City of Phoenix Electrical Apparatus Service Association V 13 Producers, 5 Users, and 2 representatives of the General interest category. ULs goal for the formation of STPs is that an STP not have more than a third of its membership from one interest cate