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1、Subjects 5085 (506, 1585) (in reply, refer to Subject 5085) 1655 Scott Blvd. Santa Clara, CA 95050 July 31, 2001 TO: Industry Advisory Conference of UL for Class 2 and Class 3 Transformers, Industry Advisory Conference of UL for Specialty Transformers, Electrical Council of Underwriters Laboratories
2、 Inc., Subscribers to UL?s Standards Services for: Class 2 and Class 3 Transformers Specialty Transformers SUBJECT: Request for Comments on Preliminary Draft Requirements for the Binational Standard for Low Voltage Transformers, UL 5085. A Technical Harmonization Committee (THC) was formed in 1994 t
3、o harmonize requirements between the Standard for Specialty Transformers (UL 506), the Standard for Class 2 and Class 3 Transformers (UL 1585), and Specialty Transformers, CSA 22.2 No. 66. The result of that effort so far is this preliminary draft. UL wants to facilitate the harmonization process, a
4、ddress industry concerns, and seek input from interested parties before the document is officially proposed. UL is therefore making this draft available to industry, council members, and inspection authorities for preliminary review and comment only. RAT I O N AL E In light of the U.S. - Canada Free
5、 Trade agreement and NAFTA, a segment of industry requested the harmonization of Canadian and U.S. general purpose transformer requirements. The idea was to have one set of specifications to facilitate transformer evaluations. This preliminary draft of UL 5085 is a result of harmonization efforts be
6、tween authorities in Canada, the United States and representatives from Canadian Standards Association International (CSA) and Underwriters Laboratories, Inc. Requirements used to conceive this draft standard were derived from CSA C22.2 No. 66, Specialty Transformers; UL 506, the Standard for Specia
7、lty Transformers; and UL 1585, the Standard for Class 2 and Class 3 Transformers. The preliminary draft standard consists of three parts. Part 1 (5085-1) is entitled ?General Requirements? and consists of requirements that are applicable to both general purpose and Class 2 and Class 3 transformers.
8、Part 2 (5085-2) is entitled ?General Purpose Transformers? and consists of specific requirements for these transformers. Part 3 (5085-3) is entitled ?Class 2 and Class 3* Transformers.? This part consists of specific requirements for Class 2 transformers. Requirements for Class 3 transformers, which
9、 are only intended for use in the United States, are included in an annex since these are U.S. national deviations. Parts 2 and 3 are intended for use with Part 1. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/562000111
10、4 Not for Resale, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -2- July 31, 2001 Attached as Appendices A, B, and C for your review and comment is the preliminary draft Standard for Low Voltage Transformers (Parts 1, 2, and 3
11、). 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. As previously noted these requirements are for preliminary review and comment only. Cur
12、rent requirements are to be used to judge a product until these requirements are first proposed and then published in final form. REQUEST FOR COMMENTS Please provide your comments concerning this preliminary draft standard by October 22, 2001. Written comments should be sent by to the attention of P
13、aul Lloret at ULs Santa Clara office, 1655 Scott Blvd., Santa Clara, CA 95050. Please reference all correspondence to Subject 5085. If you respond by fax or E-mail, please include your full name and company address to ensure a reply. UNDERWRITERS LABORATORIES INC. REVIEWED BY: PAUL LLORET (Ext. 3241
14、0) Engineering Associate Standards Department Fax: (408) 556-61 51 E-mail: Paul.E.L CLAUDE NELSON (Ext. 32625) Engineering Group Leader Conform i ty Assess m en t Se rv i ces Department 301 6JSCL SR:GD Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University
15、of Texas Revised Sub Account/5620001114 Not for Resale, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -AI - July 31, 2001 PROPOSED REQUIREMENTS ARE OF A TENTATIVE AND EARLY NATURE AND ARE FOR REVIEW AND COMMENT ONLY CURRENT RE
16、QUIREMENTS ARE TO BEUSEDTO JUDGEA PRODUCT UNTIL THESE REQUIREMENTS ARE PUBLISHED IN FINAL FORM PRELIMINARY DRAFT OF THE BINATIONAL STANDARD FOR LOW VOLTAGE TRANSFORMERS, UL 5085 PART 1 - GENERAL REQUIREMENTS JULY 31, 2001 Copyright Underwriters Laboratories Inc. Provided by IHS under license with UL
17、Licensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -A2- July 31, 2001 (Part of Preface) The Standard for Low Voltage Transformers is divided into the follo
18、wing parts: Part No. 1 General Requirements CSA 22.2 No.66-1/UL 5085-1 Part No. 2 Part No. 3 General Purpose Transformers CSAIUL 22.2 No.66-2/UL 5085-2 Class 2 and Class 3* Transformers CSAIUL 22.2 No.66-3/UL 5085-3 Part 1 covers the general requirements for transformer characteristics, marking, con
19、struction, and tests. Additional specific requirements are provided in the subsequent parts. The subsequent parts supplement requirements and/or modify the corresponding clauses in Part 1 and should be applied together with Part 1. The numbered clauses in the subsequent parts correspond to the numbe
20、red clauses in Part 1. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -A3
21、- July 31, 2001 LOW VOLTAGE TRANSFORMERS - PART 1: GENERAL REQUIREMENTS 1 Scope 1.1 These requirements cover the following types of transformers: . Air-cooled transformers and reactors for general use; . Autotransformers; . Ferroresonant transformers; . Class 2 and Class 3 transformers (which are ev
22、aluated in accordance with Part 3); . Cord-connected transformers (which are evaluated in accordance with Part 2); . Transformers incorporating overcurrent or over-temperature protective devices, transient voltage surge protectors, or capacitors; . Permanently- connected transformers rated 600 volts
23、 or less. Advisory Note: The Canadian Electrical Code, Part I , C22. I defines low voltage as any voltage from 31 to 750 V inclusive and high voltage as any voltage above 750 V. The National Electrical Code, NFPA 70, Section 710-2 defines high voltage as more than 600 V, nominal. Therefore in Canada
24、 only, a low voltage transformer may be rated up to 750V. Where information in clauses and tables in this standard reference ranges to 600V, these specifications also apply to Canada which would cover values from 600 to 750 V. 1.2 These transformers are intended to be used in accordance with the Nat
25、ional Electrical Code, NFPA 70 and Canadian Electrical Code, Part 1, C22.1-98. 1.3 The standard does not cover the following transformers: . Direct plug-in types . Ignition . Neon . High intensity lighting . Variable voltage . Fluorescent lamp types . Low voltage landscape . Transformers for welders
26、 . Swimming pool and spa . Distribution . (in the United States)Transformers with a nominal primary rating of more than 600 volts . Transformers incorporating rectifying or waveshaping circuitry . Transformers for use with radio- and television-type appliances . (in the United States)Transformers ha
27、ving overvoltage taps rated over 660 volts . Other special types of transformers covered in requirements for other electrical devices or appliances. . Liquid-im mersed . TOY 1.4 This standard and its subsequent parts establish the characteristics, construction, operating conditions, markings, and te
28、st conditions for each type of transformer. 1.5 The requirements in this standard may be modified by requirements in an end product standard if a transformer is intended for use only as a component in other equipment. 1.6 Autotransformers normally intended for industrial control applications, shall
29、also be evaluated to the requirements of UL 508, Industrial Control Equipment, and CSA C22.2 No. 14-M91, Industrial Control Equipment. 2 Definitions 2.1 The following definitions apply in this standard: CLASS 2 TRANSFORMER -A transformer that has a 30 volt rms maximum secondary potential under Copyr
30、ight Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -A4 July 31, 2001 any condition
31、 of loading. The impedance within an inherently-limited transformer limits the current output to a particular maximum value. It may or may not be provided with a thermostat or other temperature sensitive device to limit its maximum temperature. A non-inherently limited Class 2 transformer is provide
32、d with overcurrent protection to limit the maximum power output. CLASS 3 TRANSFORMER -A transformer that has a secondary potential over 30 volts rms and less than 100 volts for inherently-limited transformers, or less than 150 volts for not-inherently limited transformers. Advisory Note: These trans
33、fomers are intended for use only in the United States. See Annex D of Part 3. COMPOUND-FILLED TRANSFORMER - A transformer in which the windings are enclosed with an insulating fluid that becomes solid or remains elastic at intended operating temperatures. ENCAPSULATED COIL -A coil that is enclosed w
34、ith an insulating fluid that becomes solid. EXPOSED CORE TRANSFORMER - A transformer with exposed core lamination. NONVENTILATED DRY-TYPE TRANSFORMER - A dry-type transformer other than of the compound- filled or exposed core-type constructed to provide no intentional circulation of ambient air thro
35、ugh the transformer and is intended to operate at normal ambient room air pressure. VENTILATED DRY-TYPE TRANSFORMER -A dry-type transformer constructed so that ambient air may circulate through the enclosure to cool the transformer core and windings. WINDING -A continuous conductor made up of a numb
36、er 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 to form intermediate voltage taps, current taps, or similar items are considered a single winding. The winding can consist of singl
37、e or parallel-wound conductors. 3 General 3.1 Components 3.1.1 Except as indicated in Clause 3.1.2, a component of a product covered by this standard shall comply with the requirements for that component. See Annex B for a list of standards covering components generally used in the products covered
38、by this standard. A component shall comply with the Canadian Standards Association or the Underwriters Laboratories Inc., standards as appropriate for the country where the product is to be used. 3.1.2 A component is not required to comply with a specific requirement that: a) involves a feature or c
39、haracteristic 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. 3.1.3 A component shall be used in accordance with its ratings for the intended conditions of use. 3.1.4 Specific components are incomplete i
40、n construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as temperatures not exceeding specified limits, and shall be used only under those specific conditions. 3.1.5 In Canada the following applies: General requireme
41、nts applicable to this standard are given in In CSA Standard C22.2 No. O, Definitions and General Requirements - Canadian Electrical Code, Part II. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale
42、, 02/18/2008 00:15:50 MSTNo reproduction or networking permitted without license from IHS -,-,- Subjects 5085 (506, 1585) -A5- July 31, 2001 3.2 Reference Publications 3.2.1 Where reference is made to CSA or UL standards, such reference shall be considered to refer to the latest edition and all amen
43、dments published to that edition up to the time when this standard was approved . CSA Standards C22.2 No. O, Definitions and General Requirements - Canadian Electrical Code, Part II C22.2 No. 0.15-95, Standard for Adhesive Labels C22.2 No. 0.17, Evaluation of Properties of Polymeric Materials C22.2
44、No. 18, Outlet Boxes, Conduit Boxes, and Fittings C22.2 No. 65, Wire Connectors C22.2 No. 94, Special Purpose Enclosures C22.2 No. 153, Quick-Connect Terminals C22.2 No. 209, Thermal Cutoffs UL Standards UL 50, Enclosures for Electrical Equipment UL 94, Tests for Flammability of Plastic Materials fo
45、r Parts in Devices and UL 31 O, Electrical Quick-Connect Terminals UL 486A, Wire Connectors and Soldering Lugs for Use With Copper Conductors UL 486B, Wire Connectors for Use with Aluminum Conductors UL 486E, Equipment Wiring Terminals for Use with Aluminum and/or Copper UL 508, Industrial Control E
46、quipment UL 514C, Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers UL 746B, Polymeric Materials - Long Term Property Evaluations UL 746C, Polymeric Materials - Use in Electrical Equipment Evaluations UL 969, Marking and Labeling Systems UL 1020, Thermal Cutoffs for Use in Electrical Applianc
47、es and Components UL 1446, Systems of Insulating Materials - General Appliances Conductors 3.2.2 When this standard refers to the following publications; where reference is made, it shall be to the edition listed below. ANSI Standards ANSVNFPA 70-1 999, National Electrical Code ASTM3 Standards ASTM
48、A90, Standard Test Method for Weight (Mass) of Coating on Iron and Steel Articles with Zinc or ASTM A653/A653M, Standard Specification for Steel Sheet, Zinc-Coated, (Galvanized) or Zinc-Iron Alloy- ASTM D396-86, American Society for Testing and Materials Specification for Fuel Oils IEEE4 Standards Z
49、inc-Alloy Coatings Coated (Galvannealed) by the Hot-Dip Process, IEEE C57.12.91 Test Code for Dry-Type Distribution and Power Transformers. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/18/2008 00:15:50 MSTN