1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 858A Safety-Related Solid-State Controls for Household Electric RangesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED
2、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Safety-Related Solid-State Controls for Household Electric Ranges, UL 858A Third Edition, Dated April 12, 2007 Summary of Topics This revision to ANSI/UL 858A is being issued to re
3、move the reference to the withdrawal date of UL 873 and UL 244A. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effecti
4、ve date note indicating the date of publication or the date on which the changed requirement becomes effective. 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 photocopying, recording, o
5、r 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, incidental, conseque
6、ntial, 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 event shall ULs liabi
7、lity 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 judgment (including re
8、asonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Stand
9、ard 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 future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. DECEMBER 17, 2013 UL 858A tr1UL C
10、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 17, 2013 UL 858A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL April 12, 2007 (Title Page Reprinted: De
11、cember 17, 2013) 1 UL 858A Standard for Safety-Related Solid-State Controls for Household Electric Ranges First Edition September, 1989 Second Edition February, 1995 Third Edition April 12, 2007 This ANSI/UL Standard for Safety consists of the Third Edition including revisions through December 17, 2
12、013. The most recent designation of ANSI/UL 858A as an American National Standard (ANSI) occurred on September 25, 2012. 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 any part of the
13、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 altered in any w
14、ay. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 858A-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PER
15、MISSION FROM UL JUNE 3, 2010 UL 858A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General Requirements .4 2.1 General .4 2.2 Components .5 2.3 Units of measurement .5 2.4 References
16、 5 3 Glossary .5 INVESTIGATION 4 General Requirements .6 4.1 General .6 4.2 Spacings 8 4.3 Temperature test .8 5 Limiting Controls 8 6 Failure Mode and Effect Analysis FMEA .9 7 Electrical Supervision .22 8 Demonstrated Test Method .23 8.1 General 23 8.2 Test unit-hours 24 8.3 Test procedure 27 ENVI
17、RONMENTAL STRESS TESTS 9 General .29 10 Transient Overvoltage Tests .31 11 Electromagnetic Susceptibility Tests 31 11.1 General .31 11.2 Electrical fast transient/burst test .31 11.3 Radiated EMI test 32 12 Humidity Test 32 POWER CYCLING TESTS 13 General 32 FOLLOW-UP PROGRAM 14 General 32 MARKINGS 1
18、5 General 33 APPENDIX A Standards for ComponentsA1 JUNE 3, 2010 UL 858A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 The requirements in this standard cover safety-related solid-state controls used in household e
19、lectric ranges. These requirements supplement and, in some cases, amend the requirements in the Standard for Household Electric Ranges, UL 858, the Standard for Temperature-Indicating and -Regulating Equipment, UL 873, and the Standard for Tests for Safety-Related Controls Employing Solid-State Devi
20、ces, UL 991. Compliance with the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 series fullls the UL 873 requirements. 1.1 revised December 17, 2013 1.2 These requirements cov
21、er a solid-state control that performs any of the following functions: a) Controls cooktop heating elements. b) Controls oven normal operating temperatures. c) Controls oven self-cleaning cycle operating temperatures. d) Controls oven self-cleaning cycle door lock system. e) Controls required signal
22、 lights or audible alarms. f) Serves as a temperature-limiting control for any of the functions noted in (a) (e). g) Controls a function essential for the appliance to comply with a specic requirement in the Standard for Household Electric Ranges, UL 858. 2 General Requirements 2.1 General 2.1.1 For
23、 the purpose of this standard, a control includes a complete control assembly, a subassembly, a circuit, or an individual component. 2.1.2 A description of the normal and intended operation of a control with respect to the controlled element shall be provided by the manufacturer and used as a guide
24、for analysis and test purposes. For example, the description might state that the control is intended to monitor certain temperatures and disconnect the controlled element from the electrical supply when a higher predetermined temperature is attained. 2.1.3 When a control is intended to perform mult
25、iple protective functions (such as temperature-regulating, temperature-limiting, self-clean door lock control, and similar functions), the manufacturer is to identify those components or circuits that are involved in each protective function, and also any component or circuits that are common to mul
26、tiple functions. DECEMBER 17, 2013 UL 858A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Components 2.2.1 Except as indicated in 2.2.2, a component of a product covered by this standard shall comply with the requirements for that comp
27、onent. See Appendix A for a list of standards covering components commonly used in the products covered by this standard. 2.2.2 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 produc
28、t covered by this standard, or b) Is superseded by a requirement in this standard. 2.2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.2.4 Specic components are incomplete in construction features or restricted in performance capabilities.
29、Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.3 Units of measurement 2.3.1 Values stated without parentheses are the requirement. Values in parentheses are explana
30、tory or approximate information. 2.4 References 2.4.1 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 SUPERVISION The monitoring of a circuit so that a malfunct
31、ion results in a trouble indication. 3.2 THERMAL-LINK A non-resettable device incorporating a thermal element which will open a circuit once only when exposed for a sufficient length of time to a temperature in excess of that which it has been designed. 3.3 TROUBLE INDICATION An audible signal, whic
32、h may be supplemented by a visual signal, intended to indicate a fault or trouble condition, such as the open-circuit or short-circuit of a component in the control or an open-circuit or short-circuit to grounded metal in the connected wiring. APRIL 12, 2007 UL 858A 5UL COPYRIGHTED MATERIAL NOT AUTH
33、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INVESTIGATION 4 General Requirements 4.1 General 4.1.1 Unless otherwise specied in this standard, a solid-state control shall comply with the Standard for Solid-State Controls for Appliances, UL 244A. Compliance with the Stan
34、dard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 series fullls these requirements. 4.1.1 revised December 17, 2013 4.1.2 A solid-state control shall comply with the applicable requi
35、rements in the Standard for Temperature-Indicating and -Regulating Equipment, UL 873. Compliance with the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 series fullls these re
36、quirements. 4.1.2 revised December 17, 2013 4.1.3 A transient voltage suppression assembly supplied as part of a solid-state control shall comply with the Standard for Surge Protective Devices, UL 1449. 4.1.3 revised June 3, 2010 4.1.4 All solid-state controls are to be subjected to each of the foll
37、owing: a) The Environmental Stress Tests, Sections91 5a n d1 71 9 ,i nt h eStandard for Tests for Safety-Related Controls Employing Solid-State Devices, UL 991, b) The Power Cycling Test, Section 13, c) The Failure Mode and Effect Analysis, Section 6, and d) The Production Tests requirements specied
38、 in Section 14 in UL 858A and Supplement SA, in UL 991. 4.1.5 Other than indicated in 8.1.1, Demonstrated Test Method, Section 8, is to be conducted on each complete control assembly, subassembly, circuit, or individual component: a) That is critical, b) That is a required supervising circuit, c) Th
39、e failure mode of which is undened, as determined by the Failure Mode and Effect Analysis, or d) That performs a temperature-limiting function (See 5.2). DECEMBER 17, 2013 UL 858A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.1.6 When a
40、 risk of re is to be determined, a risk of re test indicator is to be used that consists of two layers of cheesecloth draped over the control when the control alone is tested or over the complete appliance when the appliance is tested. Ignition of the cheesecloth is indication of a risk of re. See 4
41、.1.8. 4.1.7 The cheesecloth is to be bleached cotton cloth running 14 15 yd 2 /lb (26 28 m 2 /kg) and having what is known in the trade as a count of 32 by 28, that is, for any square inch, 32 threads in one direction and 28 threads in the other direction (for any square centimeter, 13 threads in on
42、e direction and 11 threads in the other direction). Tests involving cheesecloth are to be conducted in a closed draft-free room. 4.1.8 When a risk of shock is to be determined, a risk of shock test indicator is to be used that consists of a 3-A nontime-delay fuse connected in the grounding conductor
43、 of the supply to the control or to the product. Any neutral bonding conductor or strap is to be open-circuited. Opening of the fuse is indication of a risk of electric shock. 4.1.9 A control is able to be assigned one or two temperature ratings, T max or T a .T max refers to the maximum control amb
44、ient temperature to which the control is intended to be exposed in the end-use application under any operating mode for which component temperature measurements are specied in the Standard for Household Electric Ranges, UL 858, and is used in conjunction with 8.2.5, 9.2, and 13.3. T a refers to the
45、control use ambient temperature and is the same as T max , unless the Exception to 8.2.4 is used. 4.1.10 When a control performs a safety-related function that is not specically addressed in this standard, the criteria for identifying any critical components, Demonstrated Test Method test level, and
46、 usage level shall be determined by a separate investigation. Factors to be evaluated shall include: a) The severity of possible risks of electric shock, re, and injury to persons resulting from a component failure, b) The extent and frequency of exposure to possible risks of electric shock, re, and
47、 injury to persons, c) Whether or not a component malfunction directly results in a risk of electric shock, re, or injury to persons, d) The extent of user involvement in initiating or reducing the risk of electric shock, re, or injury to persons, or where additional abnormal conditions are required
48、 to exist, and e) Whether or not a control malfunction is evident to the user prior to the user being exposed to a risk of electric shock, re, or injury to persons. See 1.2(g). JUNE 3, 2010 UL 858A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FR
49、OM UL 4.2 Spacings 4.2.1 Spacings within a control shall be maintained in accordance with the spacing requirements in the Standard for Temperature-Indicating and -Regulating Equipment, UL 873. Compliance with the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 series fullls these requirements. Exception: Spacings within a control that are reduced in accordance with the appli
