1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1097 Double Insulation Systems for Use in Electrical Equipment STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL
2、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Double Insulation Systems for Use in Electrical Equipment, UL 1097 Sixth Edition, Dated February 1, 2012 Summary of Topics Revision pages dated April 26, 2016 are being
3、 issued to reect the recent reaffirmation of UL 1097 as an American National Standard. No changes in requirements are included with this revision. The requirements are substantially in accordance with Proposal(s) on this subject dated March 11, 2016. All rights reserved. No part of this publication
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8、e requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a fu
9、ture effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. APRIL 26, 2016 UL 1097 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 26, 2016 UL 1097 tr2 No Text on This PageUL COPYRIGHTED
10、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 1, 2012 (Title Page Reprinted: April 26, 2016) 1 UL 1097 Double Insulation Systems for Use in Electrical Equipment First Edition November, 1978 Second Edition April, 1983 Third Edition June, 1993 Fo
11、urth Edition September, 1997 Fifth Edition July, 2004 Sixth Edition February 1, 2012 The most recent designation of ANSI/UL 1097 as an American National Standard (ANSI) occurred on April 26, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effecti
12、ve date information. 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 Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Ne
13、ither 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 exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 1097-2012 (R2016)UL COPY
14、RIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI
15、SSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 2.1 Units of measurement .4 2.2 Undated references .4 3 Glossary 4 CONSTRUCTION 4 General 6 5 Reinforced Insulation 7 5.1 General 7 5.2 Brush caps and brush holders 7 5.3 Commutator and end turns of the armature winding .8 5.4 Switches 9 5.5
16、 Power-supply cord .10 5.6 Internal wiring .10 5.7 Other locations 11 6 Flexible Cord .11 7 Strain Relief .11 8 Bushings .11 9 Capacitors 12 10 Transformers .12 11 Spacings .12 12 Internal Wiring 13 PERFORMANCE 13 Leakage Current Test .14 14 Dielectric Voltage-Withstand Tests .18 15 Insulation Resis
17、tance Test 18 16 Resistance to Impact Tests .19 17 Overload Tests on Isolating Transformers 20 18 Overload Test on Motors .22 19 Abnormal Operation Test .23 20 Investigation of Armature Employing Reinforced Insulation Test .23 21 Moisture Resistance Test .24 MANUFACTURING AND PRODUCTION TESTS 22 Pro
18、duction-Line Dielectric Voltage-Withstand Test 24 MARKINGS 23 General 25 FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These req
19、uirements cover electrically operated equipment marked Double Insulation or Double Insulated to be used in accordance with the National Electrical Code, ANSI/NFPA 70. 1.2 Equipment marked Double Insulation or Double Insulated shall comply with the applicable requirements in this standard and the sta
20、ndard covering the particular type of equipment the end-product standard. In cases where the end-product standard contains requirements for double insulation, that standard takes precedence. 2 General 2.1 Units of measurement 2.1.1 Values stated without parentheses are the requirement. Values in par
21、entheses are explanatory or approximate information. 2.2 Undated references 2.2.1 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. 3 Glossary 3.1 For the purpose of this standa
22、rd the following denitions apply. 3.2 ACCESSIBLE PART or SURFACE A part or surface subject to contact by persons under any condition of operation or user function. In a determination of whether a live or dead part or surface is accessible to such contact, the criteria specied in the product standard
23、 are to be applied. 3.3 BASIC INSULATION (formerly FUNCTIONAL INSULATION) The insulation applied to live parts to provide basic protection against electric shock. Basic insulation does not necessarily include insulation used exclusively for functional purposes. 3.4 DEAD METAL PART A metal or other e
24、lectrically conductive part, accessible or inaccessible, that is not conductively connected to a live part. 3.5 DOUBLE INSULATION An insulation system comprised of basic (formerly functional) insulation and supplementary insulation, with the two insulations physically separated and arranged so that
25、they are not simultaneously subjected to the same deteriorating inuences (temperature, contaminants, and the like) to the same degree. See Figure 3.1. This is generated text for gtxt. FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 4UL COPYRIGHTED MATERIAL NOT AU
26、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 3.1 Examples illustrating 3.5 FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F
27、ROM UL 3.6 LIVE PART A part that is conductively connected either to the power-supply circuit, or a secondary circuit that operates at more than 42.4 V peak with reference to ground or accessible metal, and in which the available current measured through a 1500-ohm resistor shunted with a 0.15-F cap
28、acitor connected from the part to ground or to any other accessible part exceeds 0.25 mA. 3.7 REINFORCED INSULATION An improved basic (formerly functional) insulation with such mechanical and electrical qualities that it, in itself, provides the same degree of protection against electric shock as do
29、uble insulation. It may consist of one or more layers of insulating material. Its acceptance in place of double insulation is described in 4.1 and Reinforced Insulation, Section 5. 3.8 SUPPLEMENTARY (PROTECTING) INSULATION An independent insulation provided in addition to the basic (formerly functio
30、nal) insulation to protect against electric shock in case of mechanical rupture or electrical breakdown of the basic insulation. An enclosure of insulating material may form a part or the whole of the supplementary insulation. CONSTRUCTION 4 General 4.1 The equipment shall be constructed so that dou
31、ble insulation is interposed between all live parts and each of the following: a) All accessible surfaces of the equipment; b) All inaccessible dead parts and surfaces that are conductively connected to accessible dead parts or surfaces or both. Exception No. 1: A construction that provides increase
32、d through-air and over-surface spacings between live parts and accessible dead parts and surfaces specied in the end-product standard (refer to Table 11.1) is acceptable in place of double insulation. This construction may be used only where it is impractical to provide double insulation. Exception
33、No. 2: A construction using Reinforced Insulation, Section 5, is acceptable in place of double insulation. This construction may be used only where it is impractical to provide double insulation. 4.2 The thickness and the resistance to deterioration with aging of insulation employed as supplementary
34、 insulation shall not be less than that required for the same material employed as basic insulation. A greater thickness of supplementary insulation is required if severe environmental or use conditions are likely. 4.3 The insulation qualities and resistance to deterioration with aging of materials
35、employed as reinforced insulation shall not be less than the combination of basic and supplementary insulation. 4.4 The equipment shall be constructed so that the added protection provided by the supplementary or reinforced insulation is not reduced by the normal use and reasonable abuse (see Resist
36、ance to Impact Tests, Section 16, and Abnormal Operation Test, Section 19) to which the equipment is likely to be subjected. FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
37、ERMISSION FROM UL 4.5 The equipment shall be constructed so that the following parts are not accessible: a) A live part; b) A dead part that is insulated from live parts by basic insulation only, unless it is Reinforced Insulation, Section 5; c) Basic insulation itself, unless it is Reinforced Insul
38、ation, Section 5. 4.6 The equipment shall be constructed so that all parts straps, screws, nuts, washers, springs, and the like are secured so that they are not likely to become loosened or displaced if such loosening or displacement reduces the spacings to values below those specied in Table 11.1.
39、4.7 Parts secured by two independent fastenings or by means of screws or nuts provided with lock washers are to be regarded as not likely to become loose, provided that these fastening means are not required to be removed during routine servicing. Exception: Where loosening or displacement of the pa
40、rt causes malfunctioning of the equipment and does not result in an accessible live part. 4.8 Leakage, rupture, or overlling of a reservoir, pipe, tube, or the like for storing or conducting water or other uid associated with the equipment shall not render either basic, reinforced, or supplementary
41、insulation ineffective or result in deterioration of the insulation. 5 Reinforced Insulation 5.1 General 5.1.1 Reinforced insulation can be accepted in place of double insulation in the locations described in 5.2.1.1 5.7.1. 5.2 Brush caps and brush holders 5.2.1 General 5.2.1.1 Reinforced insulation
42、 can be accepted in an accessible brush cap or brush holder if the construction complies with each of the following: a) The brush cap or brush holder shall be recessed so that, when it is mounted normally, its top is inside the plane of the opening in the surrounding portion of the enclosure of the
43、equipment. b) The brush cap or brush holder shall be entirely of insulating material. c) The brush cap or brush holder shall acceptably withstand the impact test described in 16.2. FEBRUARY 1, 2012 DOUBLE INSULATION SYSTEMS FOR USE IN ELECTRICAL EQUIPMENT - UL 1097 7UL COPYRIGHTED MATERIAL NOT AUTHO
44、RIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.2.2 Brush holders in enclosures of insulating material 5.2.2.1 Reinforced insulation is acceptable in place of double insulation at a brush holder assembly that is supported in the insulating-material housing of the equipmen
45、t. The total insulation thickness shall not be less than 3/16 inch (4.8 mm) provided that any path between parts of the enclosure is broken by barriers or the like so that there is no direct path from the outside to live parts of the brush holder assembly. 5.2.3 Brush holders in enclosures of conduc
46、tive material 5.2.3.1 Reinforced insulation is acceptable in place of double insulation at a brush holder assembly that has its own enclosure of insulating material if the construction complies with both of the following: a) All live parts of the brush holder assembly shall be enclosed in the enclos
47、ure of insulating material. Exception: The wiring terminals and the brush itself need not comply with this requirement. b) The enclosure of the brush holder assembly shall be separated from accessible dead metal parts by any one or more of the following constructions: 1) Mica not thinner than 0.005
48、inch (0.13 mm); 2) Other inorganic insulation having electrical properties at least equivalent to those of mica; 3) Acceptable organic insulating material not less than 1/16 inch (1.6 mm) thick. 5.3 Commutator and end turns of the armature winding 5.3.1 Reinforced insulation is acceptable between th
49、e commutator segments and the shaft, the end turns and the shaft, and in both locations if the insulation consists of one or more of the following: a) Sheet mica that is not less than 0.005 inch (0.13 mm) thick. b) Other inorganic insulation having electrical properties at least equivalent to those of mica. If such insulation is used under the commutator segments, the thickness of the insulation shall not be less than 0.080 inch (2.0 mm). If such insulation is used under the end turn
