M00050956
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CSA C22.2 NO. 66.2:21 Low voltage transformers - Part 2: General purpose transformers
standard by CSA Group, 08/01/2021
Preface
This is the harmonized CSA Group and UL standard for low voltage transformers . It is the second edition of CSA C22.2 No. 66.2 and the second edition of UL 5085-2. This edition of CSA C22.2 No. 66.2/UL 5085-2 supersedes the previous edition published on April, 2006.
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 cover: 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 requirements 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 modified by Part 2.
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CSA C22.2 No. 66.2:21
August 2021
Title: Low voltage transformers — Part 2: General purpose transformers
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CSA C22.2 No. 66.2:21
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R. P. de Lhorbe Schneider Electric Canada, Inc.,
North Vancouver, British Columbia, Canada
Category: Producer Interest
Chair
M. Smith Kitchener, Ontario, Canada
Category: General Interest
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Z. Tsisserev AES Engineering Ltd.,
Vancouver, British Columbia, Canada
Category: User Interest
Vice-Chair
M. Baldwin Baldwin Services Inc.,
Saskatoon, Saskatchewan, Canada
Category: General Interest
R. M. Bartholomew Electric Power Equipment Ltd.,
Vancouver, British Columbia, Canada
Category: Producer Interest
G. Benjamin ABB Electrification Canada SRI, Dorval, Québec, Canada Category: Producer Interest
R. B. Buckler ASCO Power Technologies Canada, Brantford, Ontario, Canada Category: Producer Interest
C. C. Cormier Alberta Municipal Affairs, Edmonton, Alberta, Canada Category: Regulatory Authority
Douglas QPS Evaluation Services Inc., Toronto, Ontario, Canada Category: General Interest
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Burlington, Ontario, Canada
Category: Producer Interest
R. Leduc Marex Canada Limited, Calgary, Alberta, Canada Category: User Interest
M. Lusk CSA Group,
Charlotte, North Carolina, USA
Category: General Interest
D. Mascarenhas Brampton, Ontario, Canada
Category: General Interest
S. Mercier Régie du bâtiment du Québec, Montréal, Québec, Canada Category: Regulatory Authority
M. Pilato Technical Safety BC,
Kelowna, British Columbia, Canada
Category: Regulatory Authority
L. Silecky Mersen Canada Toronto Inc., Mississauga, Ontario, Canada Category: Producer Interest
T. Simmons British Columbia Institute of Technology, Burnaby, British Columbia, Canada Category: General Interest
R. Yousef Electrical Safety Authority, Mississauga, Ontario, Canada Category: Regulatory Authority
C. Lee CSA Group,
Toronto, Ontario, Canada
Project Manager
A. Leslie Curtiss Wright Controls, Stratford, Ontario, Canada
Chair
R. Bhasin Honeywell Limited/Honeywell Limitée, Scarborough, Ontario, Canada
R. Cojocaru Transformateur Marcus du Canada. Limitée/Marcus Transformer of Canada Ltd.,
Montréal, Québec, Canada
F. Dabiet Allanson International Inc., Markham, Ontario, Canada
J. Feenstra University of the Fraser Valley, Chilliwack, British Columbia, Canada
G. Franco ATC-Frost Magnetics Inc., Oakville, Ontario, Canada
S. Hasserjian Rex Power Magnetics Div. of Transfactor Industries
Inc.,
Concord, Ontario, Canada
D. C. Hutt Hammond Electronics, Div. of Hammond Manufacturing Company Ltd.,
Waterloo, Ontario, Canada
M. A. Khan Muskego, Wisconsin, USA
W. Meng CSA Group,
Taipei City, Taiwan
D. S. Patel Hammond Power Solutions, Inc., Guelph, Ontario, Canada
J. S. Taylor Basler Electric Company, Highland, Illinois, USA
W. Wong Hammond Power Solutions, Inc., Guelph, Ontario, Canada
Tiracchia CSA Group,
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AUGUST 16, 2021 tr1
Standard for Safety for Low Voltage Transformers – Part 2: General Purpose Transformers Second Edition, Dated August 16, 2021
Summary of Topics
This new edition includes Alternate Temperature Rise Test Loading Methods
The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated January 22. 2021 and May 28, 2021.
tr2 AUGUST 16, 2021
No Text on This Page
CSA Group
CSA C22.2 No. 66.2:21
Second Edition
Underwriters Laboratories Inc. UL 5085-2
Second Edition
Low Voltage Transformers – Part 2: General Purpose Transformers
August 16, 2021
ANSI/UL 5085-2-2021
Commitment for Amendments
This standard is issued jointly by the Canadian Standards Association (operating as “CSA Group”) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or UL at anytime. 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 revisions to this Standard by means of a new edition or revised or additional pages bearing their date of issue.
ISBN 978-1-4883-3536-5 © 2021 Canadian Standards Association
All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.
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Copyright © 2021 Underwriters Laboratories Inc.
UL's Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of UL's Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL.
This ANSI/UL Standard for Safety consists of the Second Edition.
The most recent designation of ANSI/UL 5085-2 as an American National Standard (ANSI) occurred on August 16, 2021. 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 time. Proposals should be submitted via a Proposal Request in UL's On-Line Collaborative Standards Development System (CSDS) at https://csds.ul.com.
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AUGUST 16, 2021 CSA C22.2 No. 66.2:21 ♦ UL 5085-2 3
CONTENTS
Preface 5
Scope 7
Units of Measurement 7
Referenced Publications 7
Mechanical Assembly 8
Enclosure 8
6.5 Openings 8
8 Connections 8
8.1 General 8
Pressure terminal connectors 8
Leads 8
Splice compartment 9
Wiring compartment 9
Wire bending space 9
Receptacles 10
11 Spacings and Insulation 11
11.4 Insulation used in lieu of spacings 11
Current-Carrying Parts 11
Cord-Connected Transformers 11
Strain Relief 12
17 Markings. 12
17.1 General 12
Environmental condition enclosures 12
Details 13
Wiring 13
18 Tests 15
21 Bonding Conductor Test 16
Temperature (Heating) Test 16
Voltage Measurement Test 17
Impedance Test 17
Dielectric Voltage-Withstand Test 17
Applied potential 17
Induced potential 18
Overload Test. 18
Repeated Dielectric Voltage-Withstand Test 19
Maximum Output Power and Short Circuit Tests for Line Cord-Connected Transformers 19
Short Circuit Test on Transformers with Output Receptacles 19
Maximum Output Power Test on Transformers with Output Receptacles 20
Leakage Current Test 20
Power Input Test 21
Lifting or Mounting Means Test 22
Strain Relief Test 22
TABLES 23
FIGURES 31
Annex A (Informative) Manufacturing and Production Line Tests
A1 Dielectric Voltage-Withstand Test 34
Annex C (Informative)
C1 French Translations of Markings 35
4 CSA C22.2 No. 66.2:21 ♦ UL 5085-2 AUGUST 16, 2021
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AUGUST 16, 2021 CSA C22.2 No. 66.2:21 ♦ UL 5085-2 5
Preface
This is the harmonized CSA Group and UL standard for low voltage transformers. It is the second edition of CSA C22.2 No. 66.2 and the second edition of UL 5085-2. This edition of CSA C22.2 No. 66.2/UL 5085- 2 supersedes the previous edition published on April, 2006.
This harmonized Standard was prepared by a Technical Harmonization Committee comprised of members from CSA Group, Underwriters Laboratories Inc. (UL), and 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 Standard was reviewed by the CSA Subcommittee on Specialty Transformers, 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.
Application of Standard
Where reference is made to a specific number of samples to be tested, the specified number is to be considered a minimum quantity.
Note: Although the intended primary application of this Standard is stated in 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 considered equivalent to, an IEC standard. This Standard 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 accordance with NAFTA Article 905, for example, because of fundamental climatic, geographical, technological, or infrastructural factors, scientific justification, or the level of protection that the country considers appropriate. Presentation is word for word except for editorial changes.
Reasons for Differences from IEC
The THC determined that the safe use of transformers and reactors is critically dependent on the electrical system in which they are intended to be installed. Significant 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 addressed 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.
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 organization. If more than one interpretation of the literal text has been
6 CSA C22.2 No. 66.2:21 ♦ UL 5085-2 AUGUST 16, 2021
identified, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reflect the intent.
Parts
The Standard for Low Voltage Transformers is divided into the following parts:
Part Number | Standard Title | Standard Number |
1 2 3 | General Requirements General Purpose Transformers Class 2 and Class 3 Transformers | CSA C22.2 No. 66.1/UL 5085-1 CSA C22.2 No. 66.2/UL 5085-2 CSA C22.2 No. 66.3/UL 5085-3 |
NOTES –
|
AUGUST 16, 2021 CSA C22.2 No. 66.2:21 ♦ UL 5085-2 7
PART 2: GENERAL PURPOSE TRANSFORMERS
Scope
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 cover:
Air-cooled transformers and reactors for general use;
Autotransformers;
Ferroresonant transformers;
Cord-connected transformers; and
Transformers incorporating overcurrent or over-temperature protective devices, transient voltage surge protectors, or capacitors.
These requirements do not cover Class 2 and Class 3 transformers (which are evaluated in Part 3).
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 modified by Part 2.
Units of Measurement
Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.
Referenced Publications
Any undated reference to a code or standard appearing in the requirements of this Standard shall be interpreted as referring to the latest edition of that code or standard.
When a reference is made to a code or standard, the product shall comply with the code or standard of the country in which the product is intended to be used.
In Canada, general requirements applicable to this Standard are given in CSA C22.2 No. 0, General Requirements – Canadian Electrical Code, Part II.
Throughout this Standard, the CSA standard references apply to products intended for use in Canada, and the UL standard references apply to products intended for use in the United States. Combined references are separated by a slash (“ / ”) to denote the difference between the applicable requirements specified for use in Canada and the United States.
The following publications are referenced in this Standard:
CSA C22.2 No. 0, General Requirements – Canadian Electrical Code, Part II
CSA C22.2 No. 66.1, Low Voltage Transformers – Part 1: General Requirements
CSA C22.2 No. 94.2, Enclosures for Electrical Equipment, Environmental Considerations