UL 1492-1996 UL Standard for Safety Audio-Video Products and Accessories (Second Edition Reprint with revisions through and including July 24 2013)《音频-视频产品和附件》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1492 Audio-Video Products and AccessoriesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR

2、FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Audio-Video Products and Accessories, UL 1492 Second Edition, Dated April 30, 1996 Summary of Topics These revisions to UL 1492 are being issued to revise the requirements for button cell batteries to clarify

3、that the construction requirement applies to the entire battery compartment door/cover and to remove reference to the withdrawal date of UL 873. 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 requireme

4、nts are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated May

5、3, 2013. 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, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kin

6、d, 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, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other d

7、amages 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 liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim.

8、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 reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an

9、 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 Standard having future effective dates as indicated in the note following the affected item. The prior text

10、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. The following table lists the future effective dates with the corresponding reference. JULY 24, 2013 UL 1492 tr1UL COPYRIGHTED MATERIAL

11、NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Future Effective Date Reference May 9, 2014 Paragraphs 3.8A and 130.8.1, and Supplement SC. JULY 24, 2013 UL 1492 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

12、ROM UL APRIL 30, 1996 (Title Page Reprinted: July 24, 2013) 1 UL 1492 Audio-Video Products and Accessories Prior to the rst edition, the requirements for the products covered by this standard were included in the Standard for Radio Receivers, Audio Systems, and Accessories, UL 1270; Low-Voltage Vide

13、o Products Without Cathode-Ray-Tube Displays, UL 1409; and Television Receivers and High-Voltage Video Products, UL 1410. Prior to these standards, the requirements were included in UL 492. First Edition August, 1992 Second Edition April 30, 1996 This UL Standard for Safety consists of the Second Ed

14、ition including revisions through July 24, 2013. 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 Safe

15、ty are copyrighted by UL. Neither 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 2013 UNDERWRITERS LABORATORIES INC.UL CO

16、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 28, 2004 AUDIO-VIDEO PRODUCTS AND ACCESSORIES - UL 1492 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS

17、INTRODUCTION 1 Scope .9 2 General .10 2.1 Components 10 2.2 Undated references 10A 3 Glossary .10A CONSTRUCTION ALL PRODUCTS 4 General .16 5 Combination Units .16 6 Double Insulated Products .16A 7 Undercabinet Products 16A 8 Outdoor-Use and Wet-Location Products .17 9 Multiple-Supply-Circuit-Voltag

18、e Products 18 10 In-Wall Mounted Product 18 11 Fire .18 12 Electric Shock 18 12.1 Product leakage current .18 12.2 Electric shock during user-servicing .18A 13 Injury to Persons .25 13.1 General .25 13.2 Power-operated moving parts 26 13.3 Carts .26 14 Product and Accessory Assembly .26 15 User-Serv

19、icing 27 16 Spacings 28 16.1 General .28 16.2 Insulating barrier in lieu of spacings .30A 16.3 Fuse and fuse clip 31 16.4 Picture tube conductive coating 31 16.5 Field-wiring terminals .31 17 Enclosures .32 17.1 General .32 17.2 Glass dial window 32 17.3 Polymeric enclosure 32 17.4 Special construct

20、ion option for other than high-voltage products .33 18 Accessibility of Parts .36A 18.1 Articulated probe 36A 18.2 Protective screens and barriers .36A 18.3 Chassis-mounting bolts 36A 18.4 Coin probe 38 18.5 Adjustment opening 39 18.6 Control shaft .39 19 Top Opening .40 MAY 28, 2004 AUDIO-VIDEO PRO

21、DUCTS AND ACCESSORIES - UL 1492 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 20 Materials .41 20.1 General materials 41 20.2 Small parts 43 20.3 Exempted parts 43 20.4 Molded-material insulation .43 20.5 Insulation materials .43 20.6 Bar

22、rier insulating material .45 21 Corrosion Protection 45 22 Metallized Plastic Parts 45 23 Conductive Internal Mechanical Parts .45 24 Supply Connections Cord-Connected Products .46 24.1 Power-supply cord 46 24.2 Power-supply-cord length measurement .46A 24.3 Attachment plug 47 24.4 Cord connector (a

23、ppliance coupler) .47 24.5 Cord strain relief .47 24.6 Power-supply cord exit 48 24.7 Cord-bearing surface .48 24.8 Bushing .48 24.9 Cord push-back relief 48A 25 Supply Connections Permanently Connected Products 49 25.1 General .49 25.2 Separation of circuits .50 25.3 Wiring terminals 50 26 Auxiliar

24、y Power Connections .52 27 Polarization .52A 27.1 General 52A 27.2 Polarized product receptacle .53 28 Grounding, Grounding Impedance, and Continuity 53 28.1 General .53 28.2 Basic insulation 54 28.3 Supplementary insulation 54 28.4 Reinforced insulation .55 28.5 Commercial products .55 28.6 Househo

25、ld or commercial products .55 28.7 Grounding interconnected products .56 28.8 Grounding conductor identication and connection .56 28.9 Grounding-type cord connector (appliance coupler) .56A 28.10 Grounding adapters 56A 28.11 Grounded product receptacle 56A 28.12 Permanently connected products 56A 28

26、.13 Optional grounding 57 29 Current-Carrying Parts 57 29.1 General .57 29.2 Contact material 57 30 Electrical Connections .58 30.1 General .58 30.2 Misalignment of parts .58 30.3 Wire-wrapped connections 58 30.4 Wire-wrapped wire .59 30.5 Wire-wrapped terminals .59 31 Securement 60 31.1 Friction-t

27、electrical connectors 60 JUNE 18, 2010 AUDIO-VIDEO PRODUCTS AND ACCESSORIES - UL 1492 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31.2 Component handling 60 31.3 Evaluation consideration .60A 31.4 Adhesive securement .60A 31.5 Telescopi

28、ng or rod antennas .60A 31.6 Lead-wire connection terminals 61 32 Captive Parts .62 32.1 General .62 32.2 Captive knobs .62 33 Interlocks 62 33.1 General .62 33.2 User-servicing guard 63 34 Electronic Components 63 34.1 Tube interchange and substitution 63 34.2 Standardized pin/socket arrangement .6

29、4 34.3 Octal-base tube socket .64 34.4 Picture-tube-base pins 64 35 Sleeving, Tape, Tubing, Wire Insulation, and Flexible Printed Wiring 64 35.1 General .64 35.2 Primary wiring to convenience receptacle .65 35.3 Small-gauge wire .66 35.4 Wire handling 66 35.5 Accessibility of internal wiring 66 35.6

30、 Low-energy circuit wiring 66 35.7 Cable and wiring subject to motion 66A 35.8 Wiring subject to handling .67 35.9 Openings in conductive material .67 35.10 Remote or interconnecting cable 67 35.11 Audio amplier circuit output connections external speaker connection wire and terminals .68 36 Devices

31、 and Applications 69 36.1 Mounting 69 36.2 Securing means 69 36.3 Unused receptacle .70 36.4 Receptacle separation 70 36.5 Receptacle conguration .70A 36.6 Receptacle mounting clearance conductive surface clearance 70A 36.7 Receptacle mounting clearance small outlet surface clearance .70A 36.8 Recep

32、tacle insertion clearance .72 36.9 Lampholder construction 72 36.10 General switch and relay applications 72 36.11 Receptacle switch or relay .73 36.12 Double-pole, TV-rated switches controlling two circuits .73 36.13 Transfer switch .74 36.14 Solenoids and motors .74 37 Protective Devices 74 38 Tra

33、nsformers .74 38.1 General .74 38.2 Transformer enclosure 74 39 Capacitors, Varistors, and Suppressors 75 39.1 Isolating components .75 39.2 Across-the-line component 76 39.3 Electrolytic capacitor 76 39.4 Capacitor employing liquid or wax dielectric medium 76 JUNE 18, 2010 AUDIO-VIDEO PRODUCTS AND

34、ACCESSORIES - UL 1492 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 40 Line-Connected or Direct-Connected Series Resistors .76A 41 Lasers .77 42 Batteries and Battery Circuits 77 42.1 General .77 42.2 Battery connections 77 42.3 Battery t

35、erminals .78 42.4 Automotive or marine battery cord connections 78 42.5 Battery-circuit fuse 78 43 Antenna Discharge Path .78A 44 Double Protection .78A 45 Accessories .78B 45.1 Accessory installation procedure 78B 45.2 Tripods .79 45.3 Accessory jumper plug 79 45.4 Accessory connection .79 LIQUID C

36、RYSTAL DISPLAY (LCD) VIDEO PRODUCTS 46 General 79 47 Overtemperature-Protective Device 80A 48 Lamp Compartment 80A 49 Ultraviolet Radiation Interlock .80B HIGH-VOLTAGE PRODUCTS 50 General 80B 50.1 Details .80B 50.2 Degaussing coil insulation .82 50.3 Picture-tube enclosure opening 82 50.4 Picture-tu

37、be neck protection .82 50.5 Picture-tube implosion protection .83 50.6 High-voltage component 83 50.7 High-voltage part .83 51 Overload-Protective Device for High-Voltage Products 84 52 Double Protection for High-Voltage Products .85 VIDEO PRODUCTS INTENDED FOR USE IN HEALTH-CARE FACILITIES 53 Gener

38、al 94 54 Cords and Plugs 95 54.1 Attachment plug 95 54.2 Flexible cord .95 54.3 Supply cord length .95 55 Grounding .95 55.1 Product grounding 95 55.2 Double insulation .96 55.3 Accessible conductive parts .96 55.4 Isolated, accessible conductive parts .96 55.5 Grounding conductor .96 56 Separation

39、of Circuits 96A 56.1 Parts touched by patient .96A 57 Pendant Controls .97 57.1 Pendant-control enclosure .97 JUNE 18, 2010 AUDIO-VIDEO PRODUCTS AND ACCESSORIES - UL 1492 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 57.2 Pendant-control

40、cord strain relief .97 57.3 Holders and hooks .97 58 Switches .97 59 Transformers .97 60 Products Having Signaling and Nurse-Call Feature .98 61 Wheels and Casters 98 62 Cleaning and Disinfecting 98 62.1 General .98 62.2 Entry of spilled materials 98 PERFORMANCE ALL PRODUCTS 63 General 98A 63.1 Deta

41、ils .98A 63.2 Voltmeters .99 63.3 Leads, connectors, and components 99 63.4 Cheesecloth indicators 99 63.5 Supply-circuit voltage and frequency 99 64 Power Input Test 100 65 Peak Inrush Current Test .103 65.1 General 103 65.2 Test circuit .104 65.3 Product operating condition .104A 65.4 Test procedu

42、re 104A 65.5 Calculation of peak inrush current 104B 65.6 Qualication tests for peak inrush-current measuring circuit .104B 66 Grounding Path Test .108 67 Product-Leakage and Shock-Current Test 108 67.1 General 108 67.2 Product leakage current 109 67.3 Electric shock at audio output circuit terminat

43、ions .109 67.4 Electric shock at an audio output circuit under fault conditions .110A 67.5 Product shock-current .113 67.6 Stored-energy electric shock 113 67.7 Component electric shock 113 67.8 Picture-tube anode lead 113 68 Temperature Test 114 68.1 General 114 68.2 Thermal equilibrium 114A 68.3 A

44、mbient temperatures 114A 68.4 Product test conditions .116 68.5 Product operating conditions .117 68.6 Thermocouples .118 68.7 Winding temperature measurement 118 69 Maximum Voltage Measurement .118A 69.1 General .118A 69.2 Maximum voltage V 1 .119 69.3 Maximum voltage V 2 .119 70 Audio Output Power

45、 Limitation Measurement Test .119 71 Dielectric Voltage-Withstand Tests .120 71.1 General 120 NOVEMBER 20, 2000 AUDIO-VIDEO PRODUCTS AND ACCESSORIES - UL 1492 6AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 71.2 Primary circuit when factor

46、y dielectric voltage-withstand test potential exceeds 1300 V, 50 or 60 Hz, or is applied for more than 2 seconds 120 71.3 Primary circuit when factory dielectric voltage-withstand test potential exceeds 2000 V, 50 or 60 Hz, or 2828 V DC, or is applied for more than 4 seconds .120 71.4 Requirements f

47、or AC test equipment 120 71.5 Requirements for dc test equipment .122 71.6 Accessible part .122 71.7 Elevated-voltage system .123 71.8 High-voltage isolating component .123 72 Primary Insulation Voltage Test .125 73 Special Option Tests .125 73.1 Limited-power determination 125 73.2 Limited-power re

48、 tests 125 73.3 Limited power .126 73.4 Maximum power 126 74 Abnormal Operation Test Method 126 74.1 General 126 74.2 Supply-circuit fuse rating .126 74.3 Product supporting surface .126 74.4 Cheesecloth indicator 126 74.5 User-removable parts 126A 74.6 Fuse indicator .126A 74.7 Polarization .127 74

49、.8 Inherent overheating protection .127 74.9 Test duration .127 74.10 Unacceptable conditions 127 74.11 Circuit interruption 128 75 Component Abnormal-Operation Test 128 76 Receptacle Overload Test 128 77 Power Supply Tests 128 77.1 General 128 77.2 Measurement procedure .131 77.3 Power measurement tolerance 133 77.4 Referee procedures .133 77.5 Additional test details 134 77.6 Conduction of dielectric voltage-withstand test 134 77.7 Multiple-pin integrated circuits (ICs) .134 78 Picture-Tube Filament Short-Circui