UL 943B-2017 UL Standard for Safety Appliance Leakage-Current Interrupters (Third Edition).pdf

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 Third Edition, Dated December 4, 2017 SUMMARY OF TOPICS: This new edition of ANSI/UL 943B is being issued to address editorial corrections

3、and maintenance of UL Standards for Safety. These changes 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 photoco

4、pying, recording, or otherwise without prior permission 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, i

5、ncidental, consequential, indirect or similar damages, 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 ev

6、ent shall ULs liability for any damage ever exceed the 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 jud

7、gment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. DECEMBER 4, 2017 UL 943B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMIS

8、SION FROM UL DECEMBER 4, 2017 UL 943B tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 4, 2017 1 UL 943B Standard for Appliance Leakage-Current Interrupters First Edition May, 2001 Second Edition August, 2011

9、Third Edition December 4, 2017 This ANSI/UL Standard for Safety consists of the Third Edition. The most recent designation of ANSI/UL 943B as an American National Standard (ANSI) occurred on October 26, 2017 ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title P

10、age. 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 https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed

11、 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 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 943B-2017UL COPYRIGHTED MATERIAL NOT AU

12、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 4, 2017 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 Scop

13、e .5 2 Glossary .5 3 Components7 4 Units of Measurement .7 5 References.7 CONSTRUCTION 6 Mechanical Assembly .7 7 Enclosure .11 7.1 General 11 7.2 Metal enclosures 11 7.3 Polymeric enclosures 12 7.4 Corrosion resistance .12 8 Accessibility of Uninsulated Live Parts and Film-Coated Wire .12 9 Electri

14、cal Insulation 13 10 Attachment Plug 13 11 Flexible Cord .15 12 Terminations .16 13 Grounding .17 14 Spacings 17 15 Alternate Spacings Clearances and Creepage Distances 19 16 Live Parts20 17 Internal Wiring20 18 Operating Mechanism .21 19 Supervisory Circuit 21 20 Auto-Monitoring Function 22 PROTECT

15、ION AGAINST INJURY TO PERSONS 21 Sharp Edges .22 PERFORMANCE 22 General23 23 Humidity Conditioning .25 24 Leakage Current Test .25 25 Drop Test 26 26 Voltage Surge Test .27 27 Trip Threshold Measurement .28 28 High-Resistance Ground Fault Test .29 29 Dielectric Voltage-Withstand Test .32 30 Resistan

16、ce to False Tripping Test 33 31 Temperature Test.34 32 Overload Test 36 33 Low-Resistance Ground Fault Test .38 34 Endurance Test 39 35 Abnormal Operation.41 DECEMBER 4, 2017 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU

17、TION WITHOUT PERMISSION FROM UL 36 Extra-Low-Resistance Ground Faults Test .41 37 Short Circuit Test .43 38 Security of Blades Test 43 39 Crushing Resistance Test43 40 Strain-Relief Test .43 41 Security of Terminals44 42 Dust Test 44 43 Auto-Monitoring Function Test44 RATINGS 44 Details.46 MARKINGS

18、45 General46 APPENDIX A Standards for ComponentsA1 DECEMBER 4, 2017 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover appliance leakage-current

19、 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 p

20、redetermined 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 of46mA. 1.2 These requirements cover 2-wire appliance leakage-current interrupters for use only in cord-connect

21、ed 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 accepta

22、ble 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 ser

23、vice. 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 stan

24、dard 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, ei

25、ther 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 DOUBL

26、E 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. DECEMBER 4, 2017 APPLIANCE LE

27、AKAGE-CURRENT INTERRUPTERS - UL 943B 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.7 ENERGIZED PART A part at some potential with respect to another part, or to earth. 2.8 FUNCTIONAL INSULATION The insulation necessary for the proper fu

28、nctioning 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. 2.10 GROUND FAULT An unintentional electrical path between a part operating normally at some potential to ground, and groun

29、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

30、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

31、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

32、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 28.1. 2.17 SUPPLEMENTARY INSULATION An independent insulation provided in addition to the functional

33、 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. DECEMBER 4, 2017 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943

34、B 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Components 3.1 Except as indicated in 3.2, 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 c

35、overing 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 characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded

36、by a requirement in this standard. 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 limi

37、ted 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 un

38、dated 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 th

39、e 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 defe

40、cts. 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

41、 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. DECEMBER 4, 2017 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 7UL COPYRIGHTED

42、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.5 Lampholders, switches, and other similar components shall be mounted securely and turning shall be restricted from turning by more than friction between surfaces. For example, the use of a lockwasher is

43、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 indicator light in which the lamp is sealed-in by a nonremovable jewel), is not be prohibited from turning if rot

44、ation 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 shall be minimized, unless the turning of such a component is part of the design of the unit and introduces no

45、 additional risk of re or electrical shock, or both, such as reduced spacings below the minimum acceptable values or stress on a connection. 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

46、 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 maximum acceptable moment, center of gravity, dimensions, and weight of a direct plug-in unit shall comply with the req

47、uirements specied 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 excee

48、d 28 ounces (794 g). This is generated text for gtxt. DECEMBER 4, 2017 APPLIANCE LEAKAGE-CURRENT INTERRUPTERS - UL 943B 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.9 Denitions for the symbols used in 6.8 are as follows: a) W is the we

49、ight of the unit in ounces (g). b) Y is the distance illustrated in Figure 6.1 in inches (mm). c) Z is the lesser of the two distances, Z 1 or Z 2 , as illustrated in Figure 6.1 in inches (mm). d) S is the lesser of the two distances, S 1 or S 2 , as illustrated in Figure 6.1 in inches (mm). e) X is the greater of the two distances, X 1 or X 2 , as illustrated in Figure 6.1 in inches (mm). 6.10 The moment and weight specied in 6.8 are to be determined as follows: a) For units wit