ANSI UL 5085-2-2006 UL Standard for Safety Low Voltage Transformers C Part 2 General Purpose Transformers (First Edition Reprint with Revisions Through and Including November 29 20.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 5085-2 Low Voltage Transformers Part 2: General Purpose TransformersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED M

2、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low Voltage Transformers Part 2: General Purpose Transformers, UL 5085-2 First Edition, Dated April 17, 2006 Summary of Topics This revision to ANSI/UL 5085-2 is being issued to inco

3、rporate the following: Clarication of Requirements for Transformer Leads Correction of Requirements for the Temperature Test Correction of the Title of Section 32 Revision to Maximum Temperature Rise for Class 120 (E) Insulation System Clarication of Requirements for Cord Types for Cord-Connected Tr

4、ansformers Clarication of the Requirements for the Dielectric Voltage-Withstand Test Correction of References to Part 1 for the Induced Potential Test Correction of Reference to Part 1 for Lifting or Mounting Means Test Addition of Class 220(R) Insulation Systems to Table 9 for the Maximum Temperatu

5、re Rises for Transformers Rated More Than 10 kVA Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated June 29, 201

6、2. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, eit

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10、ronic Standard on the purchasers computer system. NOVEMBER 30, 2012 UL 5085-2 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/o

11、r other elements of the Standard having future effective dates as indicated in the preface. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. NOVEMBER 30, 2012 UL 5085-2 t

12、r2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Group CSA C22.2 No. 66.2-06 First Edition Underwriters Laboratories Inc. UL 5085-2 First Edition Low Voltage Transformers Part 2: General Purpose Transformers April 17, 2006 (Title Page R

13、eprinted: November 30, 2012) ANSI/UL 5085-2-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Canadian Standards Association (operating as “CSA Group”) and Underwriters Labor

14、atories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of CSA Group and UL. CSA Group and UL will issue revisio

15、ns to this standard by means of a new edition or revised or additional pages bearing their date of issue. ISBN 1-55436-210-5 2006 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. This Standard is subjec

16、t to periodic review, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquirescsagroup.org and include “Proposal for change” in the subject line: Standard designation (number); relevant claus

17、e, table, and/or gure number; wording of the proposed change; and rationale for the change. To purchase CSA Group Standards and related publications, visit CSA Groups Online Store at shopcsa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2012 Underwriters Laboratories Inc. ULs Standa

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19、 50852 as an American National Standard (ANSI) occurred on November 30, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any ti

20、me. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION

21、WITHOUT PERMISSION FROM UL CONTENTS Preface .5 1 Scope .7 5 Mechanical Assembly .7 6 Enclosure 7 6.5 Openings 7 8 Connections 7 8.1 General .7 8.4 Pressure terminal connectors 8 8.5 Leads .8 8.6 Splice compartment .9 8.7 Wiring compartment 9 8.8 Wire bending space .9 8.9 Receptacles 10 11 Spacings a

22、nd Insulation .10 11.4 Insulation used in lieu of spacings 11 13 Current-Carrying Parts 11 14 Cord-Connected Transformers .11 15 Strain Relief 12 17 Markings .12 17.1 General .12 17.3 Environmental condition enclosures 13 17.4 Details 13 17.5 Wiring .14 18 Tests 15 21 Bonding Conductor Test .16 26 T

23、emperature (Heating) Test 17 27 Voltage Measurement Test 18 28 Impedance Test 18 29 Dielectric Voltage-Withstand Test .18 29.1 Applied potential .18 29.2 Induced potential .19 30 Overload Test 19 31 Repeated Dielectric Voltage-Withstand Test 20 32 Maximum Output Power and Short Circuit Tests for Lin

24、e Cord-Connected Transformers 20 33 Short Circuit Test on Transformers with Output Receptacles .20 34 Maximum Output Power Test on Transformers with Output Receptacles 21 35 Leakage Current Test .21 36 Power Input Test .23 37 Lifting or Mounting Means Test .23 38 Strain Relief Test .23 Annex A (Info

25、rmative) A1 Dielectric Voltage-Withstand Test .34 NOVEMBER 30, 2012 CSA C22.2 NO. 66.2-06 UL 5085-2 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex C (Informative) C1 French Translations of Markings .35 APRIL 17, 2006 CSA C22.2 NO. 66

26、.2-06 UL 5085-2 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the harmonized CSA Group and UL standard for low voltage transformers. It is the rst edition of CSA C22.2 No. 66.2 and the rst edition of UL 5085-2. This harmon

27、ized standard has been jointly revised on November 30, 2012. For this purpose, CSA Group and UL are issuing revision pages dated November 30, 2012. This harmonized standard was prepared by a Technical Harmonization Committee comprised of members from CSA Group, Underwriters Laboratories Inc. (UL), a

28、nd representatives of the low voltage transformer manufacturing industry. The efforts and support of members of the Technical Harmonization Committee are gratefully acknowledged. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This stan

29、dard was reviewed by the CSA Subcommittee on C22.2 No. 66, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This Standard has bee

30、n approved by the American National Standards Institute (ANSI) as an American National Standard. Where reference is made to a specic number of samples to be tested, the specied number is to be considered a minimum quantity. Note: Although the intended primary application of this standard is stated i

31、n its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose. Level of harmonization This standard uses the IEC format but is not based on, nor is it to be considered equivalent to, an IEC standard. This st

32、andard is published as an equivalent standard for CSA Group and UL. An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical national differences are allowed for codes and governmental regulations as well as those recognized as being in a

33、ccordance with NAFTA Article 905, for example, because of fundamental climatic, geographical, technological, or infrastructural factors, scientic justication, or the level of protection that the country considers appropriate. Presentation is word for word except for editorial changes. Reasons for Di

34、fferences from IEC The Technical Harmonization Committee identied the following IEC Standard within the scope of this standard: IEC 61558-1 (1998-07), Safety of power transformers, power supply units, and similar - Part 1: General requirements. The THC determined that the safe use of transformers an

35、d reactors is critically dependent on the electrical system in which they are intended to be installed. Signicant investigation is required to assess safety and system compatibility issues that may lead to harmonization of traditional North American transformers and reactors with those presently add

36、ressed in the known IEC standards. The THC agreed such future investigation might be facilitated by completion of harmonization of North American standards for transformers and reactors. NOVEMBER 30, 2012 CSA C22.2 NO. 66.2-06 UL 5085-2 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO

37、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development

38、 organization. If more than one literal interpretation has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. CSA Group Effective Date The effective date for CSA Group will be announced through CSA I

39、nforms or a CSA Group certication notice. UL Effective Date This Standard is now in effect. Parts The Standard for Low Voltage Transformers is divided into the following parts: Part Number Standard Title Standard Number 1 General Requirements CSA C22.2 No. 66.1/UL 5085-1 2 General Purpose Transforme

40、rs CSA C22.2 No. 66.2/UL 5085-2 3 Class 2 and Class 3 Transformers CSA C22.2 No. 66.3/UL 5085-3 NOTES 1. Part 1 covers the general requirements for transformer characteristics, marking, construction, and tests. Additional specic requirements are provided in the subsequent parts. 2. Part 2 and Part 3

41、 supplement requirements and/or modify the corresponding clauses in Part 1 and should be applied together with Part 1. The numbered clauses in Part 2 and Part 3 correspond to the numbered clauses in Part 1. NOVEMBER 30, 2012 CSA C22.2 NO. 66.2-06 UL 5085-2 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR

42、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART 2: GENERAL PURPOSE TRANSFORMERS 1 Scope 1.1 As noted in Low Voltage Transformers Part 1: General Requirements, UL 5085-1, or CSA C22.2 No. 66.1, Low Voltage Transformers Part 1: General Requirements, the requirements of Part 2 cov

43、er: a) Air-cooled transformers and reactors for general use; b) Autotransformers; c) Ferroresonant transformers; d) Cord-connected transformers; and e) Transformers incorporating overcurrent or over-temperature protective devices, transient voltage surge protectors, or capacitors. 1.7 These requirem

44、ents do not cover Class 2 and Class 3 transformers (which are evaluated in Part 3). 1.8 Part 2 is intended to be used in conjunction with Part 1. The numbering of the clauses in Part 2 corresponds to the numbered clauses in Part 1. The requirements in Part 1 apply unless modied by Part 2. 5 Mechanic

45、al Assembly 5.4 A transformer weighing more than 45 kg (100 lbs) shall be provided with a means for lifting by a fork lift, cable, sling, or similar method. The lifting means may be provided on the transformer core or frame if the transformer has a removable top cover. The lifting means shall be sub

46、jected to the Lifting or Mounting Means Test in Clause 37. Note: The lifting means test does not apply to a transformer that is intended to be lifted from underneath by a fork lift or other method. 6 Enclosure 6.5 Openings 6.5.2 Openings shall prevent passage of a straight rod 12.7 mm (0.5 in) in di

47、ameter. When the distance between live parts and the enclosure and between the plane of the ventilation opening and live parts is 102 mm (4 in) or more, openings shall be constructed so that they will prevent passage of a rod 19 mm (0.75 in) in diameter. When the distance between the plane of the op

48、ening and uninsulated live parts is less than 102 mm, the rod shall have a cross-section of 13.4 mm (0.53 in). 8 Connections 8.1 General 8.1.4 A transformer shall have provision for the connection of supply and load conductors, either in the form of busbars, leads, pressure terminal connectors, or t

49、erminal pads for pressure terminal connectors. APRIL 17, 2006 CSA C22.2 NO. 66.2-06 UL 5085-2 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Note: Studs or wire binding screws may be used for eld connections when the full load current of the terminal is 24 A or less and the transformer is marked in accordance with Clause 17.5.5. The studs or wire binding screws may be used for the eld connect