1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 943B Appliance Leakage-Current InterruptersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
2、R 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 to ANSI/UL 943B is being issued to remove the reference to the withdrawal date of UL 873
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10、d are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 9, 2014 UL 943B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 9, 2014 UL 943B tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
11、 DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 17, 2011 (Title Page Reprinted: January 9, 2014) 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 th
12、rough January 9, 2014. The most recent designation of ANSI/UL 943B as an American National Standard (ANSI) occurred on August 15, 2011. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on a
13、ny 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. Neither a printed nor electronic copy of a Standard should be a
14、ltered 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 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 943B-2011UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT
15、ION WITHOUT 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 Me
16、asurement .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 Fl
17、exible Cord .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
18、 22 Humidity 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
19、32 Low-Resistance 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 F
20、ROM UL 36 Short 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 INTERRUPTE
21、RS - UL 943B 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 5 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERM
22、ISSION FROM UL 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
23、interrupters (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 pr
24、edetermined value 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-connec
25、ted appliances 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 accept
26、able for use as 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 se
27、rvice. Accordingly, 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 sta
28、ndard does not 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, e
29、ither directly 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 DOUB
30、LE INSULATION 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
31、 some potential 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 occ
32、ur. AUGUST 17, 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 groun
33、d. 2.11 LEAKAGE 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 cu
34、rrent. 2.14 RATED 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 in
35、sulation providing 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 resi
36、stance of 500 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
37、 insulation to 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 pr
38、oduct 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. 3.2 A component is not required to comply with a specic requirement that: a) Involves a feature or
39、 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. AUGUST 17, 2011 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI
40、BUTION WITHOUT 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 limit
41、ed conditions, 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 und
42、ated 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. CONSTRUCTION 6 Mechanical Assembly 6.1 An appliance leakage-current interrupter shall be formed and assembled so that it will have the
43、 strength and 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 defec
44、ts. 6.2 An appliance 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
45、with, or as an 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
46、and turning shall 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 ne
47、on pilot or indicator 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 mount
48、ed and turning 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-
49、CURRENT INTERRUPTERS - 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 as 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 maxi
