UL 1676-2000 UL Standard for Safety Conductive-Path and Discharge-Path Resistors for Use in Radio- Video- or Television-Type Appliances (Third Edition Reprint with Revisions Throug.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1676 Conductive-Path and Discharge-Path Resistors for Use in Radio-, Video-, or Television-Type AppliancesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITH

2、OUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Conductive-Path and Discharge-Path Resistors for Use in Radio-, Video-, or Television-Type Appliances, UL 1676 Third Edition, Dated September 1,

3、 2000 Summary of Topics These revisions include a revised title page to reect the ANSI approval of the current edition of UL 1676. 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

4、 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 January 25, 2013.

5、The UL Foreword is no longer located within the UL Standard. For information concerning the use and application of the requirements contained in this Standard, the current version of the UL Foreword is located on ULStandardsInfoNet at: http:/ All rights reserved. No part of this publication may be r

6、eproduced, 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 kind, either expressed or implied, including but not limited to, the

7、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 damages arising out of the use of or the inability to use this Stan

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10、ements 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 for requirements that have been revised and that have a future eff

11、ective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. MARCH 21, 2013 UL 1676 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 21, 2013 UL 1676 tr2 No Text on This PageUL COPYRIGHTED MATERIA

12、L NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL September 1, 2000 (Title Page Reprinted: March 21, 2013) 1 UL 1676 Standard for Conductive-Path and Discharge-Path Resistors for Use in Radio-, Video-, or Television-Type Appliances The First and Second Editions wer

13、e titled Standard for Discharge Path Resistors. First Edition August, 1990 Second Edition July, 1995 Third Edition September 1, 2000 This ANSI/UL Standard for Safety consists of the Third Edition including revisions through March 21, 2013. The most recent designation of ANSI/UL 1676 as an American N

14、ational Standard (ANSI) occurred on March 21, 2013. 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 Standard may be submitted to UL at any time. Proposals should be subm

15、itted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 1676-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 21, 2013 UL 1676 2

16、No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 2.1 Units of measurement .5 2.2 Undated references .5 3 Glossary .5 CONSTRUCTION 4 General 6 4A Creepage Distances and Clearance

17、s for Conductive Path Resistors 6A PERFORMANCE 5 Discharge-Path Resistor Tests 6A 5.1 Resistance test .6A 5.2 Humidity test .6B 5.3 Discharge test 7 5.4 Dielectric voltage-withstand test 9 6 Conductive-Path Resistor Tests .9 6.1 General .9 6.2 Humidity conditioning .9 6.3 Discharge test 10 7 Overvol

18、tage Test 10 8 Strain Relief Test 11 9 Torque Test .11 RATING 10 General 11 MARKING 11 General 12 MARCH 21, 2013 UL 1676 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. MARCH 21, 2013 UL 1676 4UL COPYRIGH

19、TED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover discharge-path resistors that are intended to be connected between the antenna and the supply circuit of a radio-, video-, or television-type appliance. T

20、he resistors are intended to reduce the risk of re or electric shock due to the buildup of a static electrical charge on the antenna connected to the appliance. These resistors are: a) Rated 1/2 W or greater, b) Rated 480 kW to 12 MW for use in a 50/60 Hz, 125 V or less circuit, and c) Rated 960 kW

21、to 12 MW for use in a 50/60 Hz, 126 250 V circuit. 1.2 These requirements cover conductive-path resistors, of any rating, intended to be connected between live parts and accessible conductive parts of a radio-, video-, or television-type appliance. 1.3 Deleted October 16, 2001. 2 General 2.1 Units o

22、f measurement 2.1.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.2 Undated references 2.2.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to th

23、e latest edition of that code or standard. 3 Glossary 3.1 For the purpose of this Standard, the following denitions apply. 3.2 Relocated as 3.4 October 16, 2001. 3.2.1 CLASS I PRODUCT A construction in which protection provided to reduce the risk of electric shock does not rely on basic insulation o

24、nly, but which includes an additional means of protection. The additional means of protection provides for the connection of accessible current-carrying parts to the grounding conductor of the equipment so the accessible parts do not present a risk of electric shock due to breakdown of the basic ins

25、ulation. 3.2.1 added October 16, 2001 3.2.2 CLASS II PRODUCT A construction in which protection provided to reduce the risk of electric shock does not rely on basic insulation only, but in which additional means of protection, such as double insulation or reinforced insulation, are provided when no

26、provision for grounding is provided. 3.2.2 added October 16, 2001 3.2.3 CLEARANCE The shortest distance through air between two conductive parts. 3.2.3 added October 16, 2001 OCTOBER 16, 2001 UL 1676 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

27、FROM UL 3.3 CONDUCTIVE-PATH RESISTOR A resistor that provides a conductive path between live parts and accessible conductive parts of a radio-, video-, or television-type device. 3.3.1 CREEPAGE DISTANCE The shortest distance along the surface of an insulating material between two conductive parts. 3

28、.3.1 added October 16, 2001 3.4 DISCHARGE-PATH RESISTOR A resistor that provides a discharge path between the supply circuit and a terminal or lead provided for the connection of an external antenna or cable-system input. 3.2 relocated as 3.4 October 16, 2001 3.5 INSULATION, BASIC Insulation applied

29、 to live parts to provide basic protection to reduce the risk of electric shock. 3.5 added October 16, 2001 3.6 INSULATION, DOUBLE Insulation comprised of both basic insulation and supplementary insulation. 3.6 added October 16, 2001 3.7 INSULATION, REINFORCED Single insulation applied to live parts

30、 which provides a degree of protection to reduce the risk of electric shock equivalent to double insulation. The insulation is not required to be one homogeneous piece. Insulation comprised of several layers that are not tested singly as supplementary or basic insulation is included. 3.7 added Octob

31、er 16, 2001 3.8 INSULATION, SUPPLEMENTARY Independent insulation applied in addition to basic insulation in order to provide protection to reduce the risk of electric shock in the event of breakdown of the basic insulation. 3.8 added October 16, 2001 CONSTRUCTION 4 General 4.1 A discharge-path resis

32、tor shall be constructed such that the resistor complies with Sections 5,79 , 10, and 11. 4.2 A conductive-path resistor shall be constructed such that the resistor complies with Sections 6, 10, and 11. A conductive-path resistor intended for use in equipment that complies with the Standard for Audi

33、o/Video and Musical Instrument Apparatus for Household, Commercial, and Similar General Use, UL 6500, shall also comply with Section 4A. 4.2 revised October 16, 2001 OCTOBER 16, 2001 UL 1676 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4

34、A Creepage Distances and Clearances for Conductive Path Resistors 4A added October 16, 2001 4A.1 With reference to 4.2, a conductive-path resistor that is used in a Class I product, as specied in 3.2.1, shall have the following internal and external creepage distances and clearances between end-lead

35、 termination assemblies: a) A minimum of 1.5 mm for voltages in the range of 105 130 V, and b) A minimum of 3.0 mm for voltages in the range of 220 250 V. 4A.1 added October 16, 2001 4A.2 With reference to 4.2, a conductive-path resistor that is used in a Class II product, as specied in 3.2.2, shall

36、 have the following internal and external creepage distances and clearances between end-lead termination assemblies: a) A minimum of 3.0 mm for voltages in the range of 105 130 V, and b) A minimum of 6.0 mm for voltages in the range of 220 250 V. 4A.2 added October 16, 2001 4A.3 Creepage distances a

37、nd clearances between end-lead termination assemblies and dead-metal parts or current-carrying parts shall comply with the spacing requirements of the end-product standard. 4A.3 added October 16, 2001 PERFORMANCE 5 Discharge-Path Resistor Tests 5.1 Resistance test 5.1.1 The initial resistance of 20

38、as-received, discharge-path resistors is to be measured. The initial resistance of each resistor: a) Shall be 480 kW to 12 MW for a resistor to be used in a 125 V or less circuit, or b) Shall be 960 kW to 12 MW for a resistor to be used in a 126 250 V circuit. OCTOBER 16, 2001 UL 1676 6AUL COPYRIGHT

39、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.2 Humidity test 5.2.1 Following the resistance measurements specied in 5.1.1, the discharge-path resistors are to be subjected to humidity conditioning as described in 5.2.2. Within 5 minutes after the c

40、onditioning, the resistance of each resistor: a) Shall be 12 MW or less, and b) Shall be within 50 percent of the initial resistance measured. See 5.1.1. 5.2.2 Each resistor is to be conditioned for 21 days at a temperature of 40 2C in a chamber maintained at 90 95 percent relative humidity. The cha

41、mber is to be constructed so that: a) Condensed water is continuously drained from the chamber, and b) Condensed water from the walls and roof of the chamber does not fall on the resistor. 5.2.2 revised October 16, 2001 OCTOBER 16, 2001 UL 1676 6BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE

42、PRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.3 Discharge test 5.3.1 Each resistor tested as specied in 5.1.1 5.2.2 is to be subjected to discharges from a capacitor as described in 5.3.2. The resistance of each resistor, measured at least 15 min after the conditioning and not more than 1

43、h after the conditioning: a) Shall be 12 MW or less, and b) Shall be within 50 percent of the initial resistance measured. See 5.1.1. 5.3.2 Each resistor is to be subjected to ten discharges from a dump capacitor that has been charged to a potential of 10 kV. The discharge is to be applied across th

44、e resistor leads. The interval between successive discharges is to be 5 s. Figure 5.1 illustrates the circuit to be used when performing this test. Table 5.1 Supply source potential Intended resistor circuit potential, volts Supply source potential, volts 125 or less 120 126 to 250 240 This is gener

45、ated text for gtxt. SEPTEMBER 1, 2000 UL 1676 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 5.1 Test circuit for discharge-path resistors Figure 5.1 revised October 16, 2001 V ac The supply source is to have: a) A potential as spec

46、ied in Table 5.1; b) A frequency of 60 Hz; and c) A sufficient capacity to supply 30 A to the test circuit. T Optional isolation transformer for pulse blocking, having a 1:1 turn ratio and output capability of at least 25 A. F Fuse rated 30 A, 250 V. L Choke Consists of two coils of No. 16 AWG (1.3

47、mm 2 ) solid lm-coated copper wire wound on insulating tubes placed on a 82.5 by 88.9 by 15.9 mm ferrite core. Each coil is to consist of 2.3 m of wire wound into 30 turns. The two coils are to be connected so that the magnetic ux is aiding, thereby producing an effective inductance and resistance o

48、f each coil of approximately 3 mH and 0.03 W , respectively. R Resistor under test. S High-voltage switch. C d Dump capacitor having a capacitance value of 0.01 f. V dc 10 kV dc source of supply. OCTOBER 16, 2001 UL 1676 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTIO

49、N WITHOUT PERMISSION FROM UL 5.4 Dielectric voltage-withstand test 5.4.1 Each resistor tested as specied in 5.1.1 5.3.2 shall be subject to the test specied in 5.4.2 5.4.5. The resistance of each resistor, measured at least 15 min after the test and not more than 1 h after the test: a) Shall be 12 MW or less, and b) Shall be within 50 percent of the initial resistance measured. See 5.1.1. 5.4.2 The test potential a