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1、Subject 429 333 Pfingsten Road Northbrook, IL 60062 November 14, 2003 TO: SUBJECT: Standards Technical Panel (STP) for Electrically Operated Valves, STP 429; Subscribers to ULs Standards Service for Other Interested Parties Electrically Operated Valves; Request for Comments on Proposed Requirements
2、for the Fifth Edition of the Standard for Electrically Operated Valves, UL 429; PROPOSED EFFECTIVE DATE SUMMARY OF TOPICS This bulletin proposes the following changes in requirements: Addition of alternate spacing requirements - clearances and creepage distances ALL COMMENTS DUE: December 15,2003 At
3、tached as Appendix A for your review and comment are proposed requirements for UL 429. Attached as Appendix B for your review and comment are the impact statement and proposed effective date. Attached as Appendix C is the STP membership roster. Questions regarding interpretation of requirements shou
4、ld be directed to the responsible UL Staff. Please see Appendix D of this bulletin regarding designated responsibility for the subject product categories. Please note that proposed requirements are of a tentative and early nature and are for review and comment only. Current requirements are to be us
5、ed 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 contained in this bulletin. UL suggests that all suppliers or cu
6、stomers 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. Copyright Underwriters Laboratories Inc. Provided by IHS u
7、nder license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 -2- NOVEMBER 14,2003 Comments should be made in writing and may be sent by fax to (847) 313-3411 or by mail to the
8、attention of Megan Cahill at ULs Northbrook Office, 333 Pfingsten Road, Northbrook, IL 60062. Comments may also be sent via E-mail to Megan.M.C. Please reference all correspondence to Subject 429. Note all comments received are public and may be circulated to others. If you respond by fax or E-mail,
9、 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 BY: MEGAN CAHILL Secretary for STP 429 Project Engineer Standar
10、ds Department Phone: (847) 664-341 1 Fax: (847) 313-3411 E-mai I: Megan. M .Ca hi Hus . u I .com http:/ DENNIS APOSTOLOU Chair for STP 429 PDE Manager Primary Designated Engineers, 3615DSNK Phone: (847) 664-2847 Fax: (847) 313-2847 E-mail: Dennis.W.A Copyright O 2003 Underwriters Laboratories Inc. C
11、opyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 -Al- NOVEMBER 14,2003 APPENDIX A PROPOSED REQUIREMENTS FOR
12、 THE FIFTH EDITION OF THE STANDARD FOR ELECTRICALLY OPERATED VALVES, UL 429 For your convenience in review, proposed additions to existing requirements are shown underlined and proposed deletions are shown tmd-e 2) The phase-to-ground rated system voltage used in the determination of clearances shal
13、l be the equipment rated supply voltage rounded to the next higher value (in the table for determining clearances for equipment) for all points on the supply side of an isolating transformer or the entire product when no isolating transformer is provided. The measured clearance distance used in the
14、evaluation of isolated secondary circuitry shall be interpolated when the secondary voltage occurs between voltages in the supply voltage column; 3) To determine equivalence with current through-air spacing requirements, an impulse test potential having a value as determined in UL 840 shall be appli
15、ed. b) For creepage: 1) Any printed-wiring board, which complies with the requirements in the Standard for Printed-Wiring Boards, UL 796, provides a Comparative Tracking Index (CTI) of 100, and when it complies with the requirements for direct support in UL 796, it provides a CTI of 175: 2) Unless s
16、pecified elsewhere in this standard, equipment shall be evaluated for Pollution Degree 3; 3) Printed-wiring boards are evaluated as Pollution Degree 2 when adjacent conductive material is covered by any coating, such as a solder mask, which provides an uninterrupted covering over at least one side a
17、nd the complete distance up to the other side of conductive material: 4) Printed-wiring boards shall be evaluated as Pollution Degree 1 under one of the following conditions: i) A coating, which complies with the requirements for conformal coatings in the Standard for Polymeric Materials - Use in El
18、ectrical Equipment Evaluations, UL 746C; or Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 -A3- NOVEMBER
19、 14,2003 i) At a specific printed-wiring board location by application of at least a 1/32 inch (0.79 mm) thick layer of silicone rubber or through potting, without air bubbles, in epoxy or potting material. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army N
20、orthwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 Standard Number 429 -BI- Paragraphs, Tables, Figures, or Section Proposed Effective Number Impact Date 21.1.4, 21.2.1 and Impact 1 Effective upon Sect
21、ion 21A DU blication NOVEMBER 14,2003 APPENDIX B IMPACT STATEMENT AND PROPOSED EFFECTIVE DATE Impact Statement Impact 1 Since the proposed changes provide alternative spacing requirements and will not necessitate a review or additional testing of currently Listed or Recognized products, the new requ
22、irements will become effective upon publication. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 Ruggieri
23、, James Angelo Walch, Otto Apostolou, Dennis W. Cahill, Megan -CI- General Machine Corp. User Burkert Werke GmbH PROPOSED EFFECTIVE DATE SUMMARY OF TOPICS This bulletin proposes the following changes in requirements: 1. Leads - Revise paragraph 14.2.3 to delete the word “nafurar from the term “natur
24、al gray when identifying a lead to be connected to a neutral or grounded conductor. 2. External Leakaae Test - Revise the external leakage requirements in paragraphs 28. I - 28.3, 28.6, 30. IO, 35.3, and add paragraph 28.3.1. 3. Immersion-Extraction Test - Delete paragraph 41.2 since this requiremen
25、t is referenced in the Standard for Gasket and Seals, UL 157. COMMENTS DUE: MARCH 26,2003 Attached as Appendix A for your review and comment are proposed requirements for UL 429. Attached as Appendix B for your review and comment are the impact statements and proposed effective date. Attached as App
26、endix C is the STP membership roster. Questions regarding interpretation of requirements should be directed to the responsible UL Staff. Please see Appendix D of this bulletin regarding designated responsibility for the subject product categories. Please note that proposed requirements are of a tent
27、ative and early nature and 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
28、affected by the requirements 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
29、identified in future bu I let ins. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 -2- FEBRUARY 26,2003 C
30、omments should be made in writing and may be sent by fax to (408) 556-6045 or by mail to the attention of Marcia Kawate at ULs Santa Clara office at 1655 Scott Blvd, Santa Clara, CA 95050. Comments may also be sent via E-mail to Marcia.M.Kawateus.uI.com. Please reference all correspondence to Subjec
31、t 429. Note all comments received are 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 prop
32、osals. UNDERWRITERS LABORATORIES INC. REVIEWED BY: MARCIA KAWATE (Ext. 32996) Secretary for STP 429 Standards Department Santa Clara office Phone: (408) 985-2400 Fax: (408) 556-6045 E-mail: Marcia.M.Kawateus.uI.com http:/ Copyright O 2003 Underwriters Laboratories Inc. DENNIS APOSTOLOU (Ext. 42847)
33、Chair for STP 429 Conformity Assessment Services 301 3FNBK Northbrook office Ph: (847) 272-8800 SR:MK bul-429-20030226 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or ne
34、tworking permitted without license from IHS -,-,- SUBJECT 429 -Al- FEBRUARY 26,2003 APPENDIX A PROPOSED REQUIREMENTS FOR THE FIFTH EDITION OF THE STANDARD FOR ELECTRICALLY OPERATED VALVES, UL 429 For your convenience in review, proposed additions to existing requirements are shown underlined and pro
35、posed deletions are shown tmd-e& . Proposed new requirements are identified by (NEW). In the case of extensively revised paragraphs, the original text is identified by (CURRENT) and is tmd-e&, followed by the proposed text identified by (PROPOSED). A paragraph that is proposed to be deleted is ident
36、ified by (DELETED) and is shown tmd-e&. 1. LEADS RATIONALE UL 429 currently requires that a lead intended to be connected to an insulated grounded conductor be identified by a white or natural gray outer finish. However, the term “natural gray“ is an undefined term that is no longer used in the Nati
37、onal Electrical Code. Therefore, UL proposes that the word “natural“ be deleted from the term “natural gray“ in paragraph 14.2.3. This proposal is consistent with Article 200 of the National Electrical Code, ANSVNFPA 70-2002. PROPOSAL 14.2.3 A lead intended for connection of a neutral or grounded su
38、pply conductor shall be finished white or mtmi gray, and shall be distinguishable from the other leads. No other lead shall be so identified. 2. EXTERNAL LEAKAGE TEST RATIONALE UL 429, paragraph 28.3 limits external leakage for general-purpose air and inert gas valves to 1.5 cubic feet per hour (42,
39、500 cm3/h). This leakage limit is currently applied to sealed joints on a valve body but not applied to valve parts that are designed to vent air to the same surrounding environment. The need for external leakage testing to determine the effects of torque, endurance or burnout testing for a general-
40、purpose air valve will not be affected by these proposals. Also, eliminating the external leakage limit for a general-purpose air valve does not adversely affect the level of safety for these types of valves. Because excessive leakage from an inert gas could accumulate in a closed environment and wo
41、uld not sustain respiration, this proposal does not apply to general purpose valves controlling inert gases. Therefore, UL proposes to revise paragraphs 28.1, 28.2, 28.3, 28.6, 30.10, 35.3, and add paragraph 28.3.1 to clarify the external leakage test requirements. This inconsistency would be elimin
42、ated with adoption of these proposals. PROPOSALS 28 External Leakage Test 28.1 A valve shall be tested for external leakage as sDecified in the toraue. endurance and burnout tests Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130
43、 Not for Resale, 08/30/2006 01:54:35 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 429 -A2- FEBRUARY 26,2003 28.2 Except as indicated in 28.3 and 28.3.1, a valve shall not leak externally at a rate in excess of 200 cubic centimeters per hour (cm3/hr) when tested w
44、ith air or nitrogen gas at a pressure of one and one-half times the maximum rated pressure but not less than 1/2 psig (3.5 kPa) with the valve in the open position and the outlet closed. 28.3 A general purpose valve for airei0 inert gas shall not leak externally at a rate in excess of 1.5 cubic feet
45、 per hour (42,500 cm3/hr) when tested at maximum rated pressure. 28.3.1 A aeneral Dumose a ir valve that is subjected to a n external leakaae test followina a to raue, endurance or burnout test. s hall not leak externallv in excess o f value measured du rina the as-received st CO ndition. The test I
46、S to be CO nducted at maximum rated D ressure. No other external leakaae limits are sDecified for aeneral Dumose air valves. 28.6 Leakage of test fluid through a diaphragm-type gas valve, when pressure is applied to one side of the diaphragm only, shall not exceed that specified in 29.6 for seat lea
47、kage, when the valve is tested with a pressure of one and one-half times maximum rated pressure but not less than 1/2 psig (3.5 kPa). 30.10 The appropriate tests for external leakaae and seat leakages are to be conducted before and afte r - t h e endurance test. 35.3 If the valve body is nonmetallic
48、, three samples are to be tested. The external leakaae test is to be conducted before and after the burnout test and is to comDIv with the reauirements in n T I e * Section 28. 3. IMMERSION-EXTRACTION TEST RATIONALE UL 429, paragraph 41 .I references the Immersion-Extraction Test in the Standard for Gaskets and Seals, UL 157. This test is to be conducted in accordance with paragraph 11.4.2.3 of UL 157. Because paragraph 11.4.2.3 of UL 157 describes the selection of test