UL 506-2017 UL Standard for Safety Specialty Transformers (Fourteenth Edition Reprint with Revisions Through and Including November 29 2017).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 506 Specialty Transformers STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED

2、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Specialty Transformers, UL 506 Fourteenth Edition, Dated June 2, 2017 Summary of Topics This new edition of ANSI/UL 506 is being issued to address universal upkeep of UL Standards for Safety. These revisi

3、ons are considered to be non-substantive and not subject to ULs STP process. 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 permissio

4、n of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,

5、 including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the

6、 price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting

7、from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JUNE 2, 2017 UL 506 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 2, 2017 UL 506 tr2 No Text on This PageUL

8、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 2, 2017 1 UL 506 Standard for Specialty Transformers First Edition November, 1921 Second Edition June, 1931 Third Edition June, 1940 Fourth Edition October, 1952 Fifth Edition December, 1967

9、 Sixth Edition May, 1973 Seventh Edition May, 1973 Eighth Edition July, 1977 Ninth Edition December, 1979 Tenth Edition December, 1989 Eleventh Edition July, 1994 Twelfth Edition May, 2000 Thirteenth Edition June, 2008 Fourteenth Edition June 2, 2017 This ANSI/UL Standard for Safety consists of the

10、Fourteenth Edition. The most recent designation of ANSI/UL 506 as a Reaffirmed American National Standard (ANS) occurred on October 12, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 506 on Decembe

11、r 22, 1989. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. 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 ULs On-Line Collaborative S

12、tandards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusi

13、ve property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 506-2008 (R2012)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZE

14、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 General 7 2.1 Components .7 2.2 Units of measurement.7 2.3 Undated references .7 3 Glossary .8 ALL TRANSFORMERS CONSTRUCTION 4 Mechanical Assembly .8 5 Enclosure 8 6 Corrosion Resistance.11 7 Wir

15、ing Terminals.11 8 Leads Including Flexible Cords 11 9 Internal Wiring .12 10 Bushings for Low Voltage Wiring Nominal 600 Volts or Less .13 11 Insulating Material for Mounting Low-Voltage Live Parts Nominal 600 Volts or Less .14 12 Coil Insulation 14 13 Wiring Devices .14 PERFORMANCE 14 General14 15

16、 Temperature Test.15 16 Pullout, Bending, and Twisting Tests 16 MARKINGS 17 Details.17 SPECIALTY STEP-UP TRANSFORMERS GENERAL 18 Details.17 CONSTRUCTION 19 General17 20 Enclosure 18 21 Insulating Materials .19 22 Connections19 22.1 Primary terminals and leads .19 22.2 Secondary terminals and leads 2

17、2 23 Spacings 25 24 Guarding of Live Parts and Grounding 27 JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 25 Capacitors .28 PERFORMANCE 26 General29 27 Open-Circuit Secondary Voltage Test .29 2

18、8 Input Test30 29 Heating Test .30 30 Short-Circuit Secondary Current Test .31 31 Dielectric Voltage-Withstand Test .31 32 Burnout Test .32 33 Open-Circuit Secondary Operation Test .33 34 Switch Tests .33 34.1 General .33 34.2 Overload 33 34.3 Endurance 33 TEST BY THE MANUFACTURER 35 Production Line

19、 Grounding Continuity Test.34 RATINGS 36 Details.34 MARKINGS 37 Details.35 IGNITION TRANSFORMERS GENERAL 38 Details.35 CONSTRUCTION 39 General36 40 Enclosure 37 41 Primary Connections 38 42 Secondary Terminals39 43 Spacings 39 44 Grounding .40 45 Capacitors .40 PERFORMANCE 46 General41 47 Open-Circu

20、it Secondary Voltage Test .41 48 Input Test43 49 Interchangeability Test 43 50 Heating Test .44 51 Dielectric Voltage-Withstand Test .45 JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 52 Short-C

21、ircuit Operation Test46 RATINGS 53 Details.46 MARKINGS 54 Details.47 APPENDIX A Standards for ComponentsA1 JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requireme

22、nts cover ignition transformers for use with gas burners and oil burners and specialty step-up transformers used in applications such as insect electrocuting. Transformers incorporating overcurrent or over-temperature protective devices, transient voltage surge protectors, or power factor correction

23、 capacitors are also covered by these requirements. These transformers are intended to be used in accordance with the National Electrical Code, NFPA 70. 1.2 These requirements do not cover liquid-immersed transformers, variable voltage autotransformers, transformershavinganominalprimaryratingofmoret

24、han600volts,transformershavingovervoltagetaps rated over 660 volts, cord and plug connected transformers, garden light transformers, voltage regulators, swimming pool and spa transformers, or other special types of transformers covered in requirements for other electrical devices or appliances. 1.3

25、These requirements do not cover: a) Autotransformers used in industrial control equipment, which are evaluated in accordance with the Standard for Industrial Control Equipment, UL 508. b) Class 2 or Class 3 transformers, which are evaluated in accordance with the Standard for Low Voltage Transformer

26、s Part 1: General Requirements, UL 5085-1, and the Standard for Low Voltage Transformers Part 3: Class 2 and Class 3 Transformers, UL 5085-3. c) Toy transformers, which are evaluated in accordance with the Standard for Toy Transformers, UL 697. d) Transformers for use with radio- and television-type

27、 appliances, which are evaluated in accordance with the Standard for Transformers and Motor Transformers for Use in Audio-, Radio-, and Television-Type Appliances, UL 1411. e) Transformers for use with high intensity discharge lamps, which are evaluated in accordance with the Standard for High-Inten

28、sity-Discharge Lamp Ballasts, UL 1029. f) Transformers for use with uorescent lamps, which are evaluated in accordance with the Standard for Fluorescent-Lamp Ballasts, UL 935. g) Ventilated transformers for general use or non-ventilated transformers for general use (other than compound lled or expos

29、ed core types), which are evaluated in accordance with the Standard for Dry-Type General Purpose and Power Transformers, UL 1561. h) Dry-type distribution transformers rated over 600 volts, which are evaluated in accordance with the Standard for Transformers, Distribution, Dry-Type Over 600 Volts, U

30、L 1562. i) Transformers incorporating rectifying or waveshaping circuitry evaluated in accordance with the Standard for Power Units Other Than Class 2, UL 1012. j) Transformers of the direct plug-in type evaluated in accordance with the Standard for Class 2 Power Units, UL 1310. k) Transformers for

31、use with electric discharge and neon tubing, which are evaluated in accordance with the Standard for Neon Transformers and Power Supplies, UL 2161. JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL

32、 l) General purpose and industrial control transformers evaluated in accordance with the Standard for Low Voltage Transformers Part 1: General Requirements, UL 5085-1, and the Standard for Low Voltage Transformers Part 2: General Purpose Transformers, UL 5085-2. 2 General 2.1 Components 2.1.1 Except

33、 as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.1.2 A component is not required to comply with a spec

34、ic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended con

35、ditions of use. 2.1.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditio

36、ns. 2.2 Units of measurement 2.2.1 When a value for measurement is followed by a value in other units in parentheses, the rst stated value is the requirement. 2.2.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-mean-square (rms). 2.3 Undated reference

37、s 2.3.1 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. JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI

38、BUTION WITHOUT PERMISSION FROM UL 3 Glossary 3.1 For the purpose of this standard, the following denitions apply. 3.2 COMPOUND-FILLED TRANSFORMER A transformer in which the windings are enclosed with an insulating uid that becomes solid, or remains plastic, at intended operating temperatures. 3.3 EN

39、CAPSULATED COIL A coil that is enclosed with an insulating uid that becomes solid. 3.4 EXPOSED CORE TRANSFORMER A transformer with exposed core lamination. 3.5 NONVENTILATED DRY-TYPE TRANSFORMER A dry-type transformer other than of the compound-lled or exposed core-type that is constructed so as to

40、provide no intentional circulation of ambient air through the transformer and is intended to operate at normal ambient room air pressure. 3.6 VENTILATED DRY-TYPE TRANSFORMER A dry-type transformer that is constructed so that ambient air may circulate through the enclosure to cool the transformer cor

41、e and windings. 3.7 WINDING A continuous conductor made up of a number of turns magnetically coupled to a magnetic core, to which a voltage is either applied or induced. Two or more such conductors that are permanently factory connected together to form intermediate voltage taps, current taps, or th

42、e like are considered to be a single winding. The winding can consist of single or parallel-wound conductors. ALL TRANSFORMERS CONSTRUCTION 4 Mechanical Assembly 4.1 A transformer shall be formed and assembled so that it will have the strength and rigidity necessary to resist the abuses to which it

43、is likely to be subjected. A risk of re, electric shock, or injury to persons shall not result from a reduction of spacings, loosening or displacement of parts, or other serious defect due to total or partial collapse of the transformer. 5 Enclosure 5.1 In addition to the overall enclosure, the requ

44、irements in 5.2 5.15 apply to those portions of an enclosure surrounding a terminal or wiring compartment. 5.2 A sheet steel enclosure shall be formed from stock having a thickness of not less than 0.026 inch (0.66 mm) if uncoated or not less than 0.029 inch (0.74 mm) if zinc coated. Exception: Shee

45、t steel having a thickness of not less than 0.020 inch (0.51 mm) if uncoated or not less than 0.023 inch (0.58 mm) if zinc coated may be used for drawn end bells having a maximum width or length of 2-1/4 inches (57.2 mm) on the at portion and 1-1/2 inches (38.1 mm) at the base of the drawn portion.

46、Figure 5.1 illustrates these portions of an end bell. This is generated text for gtxt. JUNE 2, 2017 SPECIALTY TRANSFORMERS - UL 506 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.3 A sheet aluminum enclosure shall be formed from stock ha

47、ving a thickness of not less than 0.040 inch (1.02 mm). 5.4 The thickness of a sheet steel enclosure is determined by taking the numerical average of ve micrometer readings equally spaced across the full width of the sheet as rolled. 5.5 The thickness of an enclosure of nonferrous sheet metal shall

48、provide strength and rigidity not less than that of an enclosure of sheet steel as described in 5.2. 5.6 A cast iron enclosure shall not be less than 1/8 inch (3.2 mm) thick at any point and of greater thickness at reinforcing ribs and edges of doors or covers. 5.7 A cast iron enclosure shall not be

49、 less than 1/4 inch (6.4 mm) thick at tapped holes for conduit. 5.8 If threads for the connection of conduit are tapped all the way through a hole in a transformer enclosure, or if an equivalent construction is used, there shall not be less than 3-1/2 or more than 5 threads in the metal. The construction shall enable the secure attachment of a standard conduit bushing. 5.9 If threads for the connection of conduit are tapped only part of the way through a hole in the en