1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 943B Appliance Leakage-Current Interrupters STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERI
2、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Appliance Leakage-Current Interrupters, UL 943B Second Edition, Dated August 17, 2011 SUMMARY OF TOPICS: This revision is being issued to indicate the most recent designation of ANSI/UL 9
3、43B as a Reaffirmed American National Standard (ANS). The requirements are substantially in accordance with Proposal(s) on this subject dated July 15, 2016. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All righ
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8、ard on the purchasers computer system. SEPTEMBER 16, 2016 UL 943B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 16, 2016 UL 943B tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI
9、BUTION WITHOUT PERMISSION FROM UL AUGUST 17, 2011 (Title Page Reprinted: September 16, 2016) 1 UL 943B Standard for Appliance Leakage-Current Interrupters First Edition May, 2001 Second Edition August 17, 2011 This ANSI/UL Standard for Safety consists of the Second Edition including revisions throug
10、h September 16, 2016. The most recent designation of ANSI/UL 943B as a Reaffirmed American National Standard (ANS) occurred on September 16, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of the St
11、andard 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. Neither a printed nor electronic copy of a Standard should be altered in any way
12、. 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 943B-2011 (R2016)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHO
13、UT PERMISSION FROM UL AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Glossary .7 3 Components .8 4 Units of Measuremen
14、t .9 5 References 9 CONSTRUCTION 6 Mechanical Assembly .9 7 Enclosure .12 7.1 General .12 7.2 Metal enclosures 12 7.3 Polymeric enclosures 13 7.4 Corrosion resistance .13 8 Accessibility of Uninsulated Live Parts and Film-Coated Wire .13 9 Electrical Insulation 14 10 Attachment Plug 14 11 Flexible C
15、ord .16 12 Terminations 17 13 Grounding 18 14 Spacings .18 15 Alternate Spacings Clearances and Creepage Distances .20 16 Live Parts 21 17 Internal Wiring 21 18 Operating Mechanism 22 19 Supervisory Circuit 22 PROTECTION AGAINST INJURY TO PERSONS 20 Sharp Edges .23 PERFORMANCE 21 General 23 22 Humid
16、ity Conditioning 25 23 Leakage Current Test 25 24 Drop Test 27 25 Voltage Surge Test 27 26 Trip Threshold Measurement .28 27 High-Resistance Ground Fault Test 29 28 Dielectric Voltage-Withstand Test 32 29 Resistance to False Tripping Test .33 30 Temperature Test .34 31 Overload Test .36 32 Low-Resis
17、tance Ground Fault Test 38 33 Endurance Test .39 34 Abnormal Operation .40 35 Extra-Low-Resistance Ground Faults Test 41 AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 36 Sho
18、rt Circuit Test 43 37 Security of Blades Test 43 38 Crushing Resistance Test 43 39 Strain-Relief Test 43 40 Security of Terminals 44 41 Dust Test .44 RATINGS 42 Details .44 MARKINGS 43 General 44 APPENDIX A Standards for ComponentsA1 AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 4
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20、 This page intentionally left blank. AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover appliance leakage-current interrupters (
21、ALCIs), intended for use only in 2- or 3- wire alternating-current circuits wherein one of the wires is grounded in accordance with the National Electrical Code, ANSI/NFPA 70. They are intended to interrupt the electric circuit to the load when a fault current to ground exceeds some predetermined va
22、lue that is less than that required to operate the overcurrent protective device of the supply circuit. An ALCI trips when the current to ground reaches a value in the range of46m A . 1.2 These requirements cover 2-wire appliance leakage-current interrupters for use only in cord-connected appliances
23、 intended for connection to alternating-current circuits of 250 V or less. An additional ground conductor may be provided. They are not to be provided with a general-purpose outlet receptacle, cord-connector body, or similar devices. Devices complying with these requirements are acceptable for use a
24、s components in an end product where the acceptability of the combination is to be determined. 1.3 The acceptability of an appliance leakage-current interrupter in any particular application depends upon its ability to be used continuously under the conditions that prevail in actual service. Accordi
25、ngly, for a particular application, an appliance leakage-current interrupter may be affected by the requirements for the equipment it is used in, and it may be necessary to additionally evaluate features or performance characteristics that are not specied in this standard. 1.4 This standard does not
26、 cover ground-fault circuit-interrupters, which are covered by the Standard for Ground-Fault Circuit-Interrupters, UL 943. 2 Glossary 2.1 For the purpose of this standard, the following denitions shall apply: 2.2 ACCESSIBLE PART A part so located that it can be contacted by a person, either directly
27、 or by means of a probe or tool. 2.3 AUTOMATIC RECLOSURE Denotes the act of an appliance leakage-current interrupter resetting itself after having been tripped. 2.4 CORD CONNECTED Denotes connection to a supply circuit by way of a exible cord terminating in an attachment plug. 2.5 DOUBLE INSULATION
28、The insulation system resulting from a combination of functional and supplementary insulation. 2.6 ENCLOSURE Any surface or surrounding structure intended to minimize access to energized parts or parts presenting real or potential risk of injury to persons. 2.7 ENERGIZED PART A part at some potentia
29、l with respect to another part, or to earth. 2.8 FUNCTIONAL INSULATION The insulation necessary for the proper functioning of the device, and for basic protection against the risk of electric shock. 2.9 INDOOR USE Use in an indoor location or where exposure to rain is not likely to occur. AUGUST 17,
30、 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.10 GROUND FAULT An unintentional electrical path between a part operating normally at some potential to ground, and ground. 2.11 LEAKAG
31、E CURRENT All currents including capacitively coupled currents which may be conveyed between energized parts of a circuit and ground or other parts. 2.12 ORDINARY TOOLS Pliers, and at-bladed and cross recessed-head (Phillips type) screwdrivers. 2.13 RATED CURRENT The marked value of current. 2.14 RA
32、TED VOLTAGE For devices with a marked voltage within the range of 110 125 V, the rated voltage is to be considered to be 120 V. For devices with an additional marked voltage within the range of 190 250 V, the rated voltage is considered to be 120/240 V. 2.15 REINFORCED INSULATION An insulation provi
33、ding protection against the risk of electrical shock that is equivalent to double insulation. 2.16 RISK OF ELECTRIC SHOCK A risk of electric shock hazard is considered to exist at a part of an appliance leakage-current interrupter if: a) There would be current of 6 mA or more in a resistance of 500
34、ohms connected between the part in question and the grounded supply conductor, and b) The device would not operate to open the circuit to the 500-ohm resistor within the time allowed in 27.1. 2.17 SUPPLEMENTARY INSULATION An independent insulation provided in addition to the functional insulation to
35、 insure protection against the risk of electric shock in the event that functional insulation should fail. 2.18 TRIP Automatic interruption by the appliance leakage-current interrupter of the electric circuit to the load. 3 Components 3.1 Except as indicated in 3.2, a component of a product covered
36、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. 3.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristi
37、c 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. AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
38、 PERMISSION FROM UL 3.3 A component shall be used in accordance with its rating established for the intended conditions of use. 3.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions,
39、 such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 4 Units of Measurement 4.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 5 References 5.1 Any undated reference
40、 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. CONSTRUCTION 6 Mechanical Assembly 6.1 An appliance leakage-current interrupter shall be formed and assembled so that it will have the strength and
41、rigidity necessary to resist abuses to which it is likely to be subjected, without producing or increasing a risk of re, electric shock or injury to persons due to total or partial collapse with resulting reduction of spacings, loosening or displacement of parts, or other serious defects. 6.2 An app
42、liance leakage-current interrupter shall have all parts reliably secured in place. 6.3 An appliance leakage-current interrupter shall be constructed so that it will not be necessary to open or remove the enclosure when used as intended. 6.4 Male contact devices such as plugs, provided with, or as an
43、 integral part of, an appliance leakage-current interrupter shall also comply with the applicable construction and performance requirements from the Standard for Attachment Plugs and Receptacles, UL 498. 6.5 Lampholders, switches, and other similar components shall be mounted securely and turning sh
44、all be restricted from turning by more than friction between surfaces. For example, the use of a lockwasher is acceptable to restrict the turning of a device having a single hole mounting means. Exception No. 1: A lampholder of a type in which the lamp cannot be replaced, (such as a neon pilot or in
45、dicator light in which the lamp is sealed-in by a nonremovable jewel), is not be prohibited from turning if rotation cannot reduce spacings below the minimum acceptable values or produce stress on a connector. Exception No. 2: A switch or other similar component shall be securely mounted and turning
46、 shall be minimized, unless the turning of such a component is part of the design of the unit and introduces no additional risk of re or electrical shock, or both, such as reduced spacings below the minimum acceptable values or stress on a connection. AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERR
47、UPTERS - UL 943B 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.6 An indicator light shall be one in which the lamp is sealed-in, such as by a nonremovable jewel. 6.7 A switch shall be located within the unit enclosure in such a manner a
48、s not to be accessible or exposed to tampering, nor subject to damage during normal use. This requirement does not apply to the actuating means of a switch. 6.8 The maximum acceptable moment, center of gravity, dimensions, and weight of a direct plug-in unit shall comply with the requirements specie
49、d in (a), (b), (c) and (d). See 6.9, 6.10 and Figure 6.1. a) The quotient of WY/Z shall not exceed 48 ounces (1361 g). b) The quotient of WY/S shall not exceed 48 ounces (1361 g). c) The product of WX shall not exceed 80 ounce-inches (0.56 Nm). d) The weight of a unit shall not exceed 28 ounces (794 g). This is generated text for gtxt. 6.9 Denitions for the symbols used in 6.8 are as follows: a) W is the weight of the unit in ounces (g). b) Y is the distance illustrated in Figure
