ANSI 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 T.pdf

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 Appliances STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

2、OR DISTRIBUTION WITHOUT 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

3、, Dated September 1, 2000 Summary of Topics This revision to ANSI/UL 1676 is being issued to reect the recent reaffirmation of this standard as an American National Standard. No changes have been made to the requirements within this standard. Text that has been changed in any manner or impacted by U

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9、eUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL September 1, 2000 (Title Page Reprinted: May 30, 2017) 1 UL 1676 Standard for Conductive-Path and Discharge-Path Resistors for Use in Radio-, Video-, or Television-Type Appliances The First an

10、d Second Editions were 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 May 30, 2017. The most recent designation of ANSI/UL 16

11、76 as a Reaffirmed American National Standard (ANS) occurred on May 30, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submi

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13、egarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 1676-2013 (R2017)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 30, 2017 UL 1676 2 No Text on This PageUL

14、 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 Clearances for Conductive Path

15、Resistors .6 PERFORMANCE 5 Discharge-Path Resistor Tests 6A 5.1 Resistance test .6A 5.2 Humidity test .6A 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 Overvoltage Test 10 8 Strain

16、Relief Test 11 9 Torque Test .11 RATING 10 General 11 MARKING 11 General 12 MAY 30, 2017 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 COPYRIGHTED MATERIAL NOT AUTHORI

17、ZED 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. The resistors are intende

18、d 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 k to 12 M for use in a 50/60 Hz, 125 V or less circuit, and c) Rated 960 k to 12 M for use in a 50/60

19、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 of measurement 2.1.1 Values s

20、tated 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 the latest edition of that cod

21、e 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 only, but which includes an a

22、dditional 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 insulation. 3.2.2 CLASS II PROD

23、UCT 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 provision for grounding is provided. 3.2.3 CLEARANCE The

24、shortest distance through air between two conductive parts. 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. MAY 30, 2017 UL 1676 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT

25、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.3.1 CREEPAGE DISTANCE The shortest distance along the surface of an insulating material between two conductive parts. 3.4 DISCHARGE-PATH RESISTOR A resistor that provides a discharge path between the supply circuit and a terminal or lead

26、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 to live parts to provide basic protection to reduce the risk of electric shock. 3.6 INSULATION, DOUBLE Insulation comprised of both basic insulatio

27、n and supplementary insulation. 3.7 INSULATION, REINFORCED Single insulation applied to live parts 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 l

28、ayers that are not tested singly as supplementary or basic insulation is included. 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. CONST

29、RUCTION 4 General 4.1 A discharge-path resistor 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 equipm

30、ent that complies with the Standard for Audio/Video and Musical Instrument Apparatus for Household, Commercial, and Similar General Use, UL 6500, shall also comply with Section 4A. 4A Creepage Distances and Clearances for Conductive Path Resistors 4A.1 With reference to 4.2, a conductive-path resist

31、or 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 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

32、220 250 V. 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 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

33、 130 V, and b) A minimum of 6.0 mm for voltages in the range of 220 250 V. MAY 30, 2017 UL 1676 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4A.3 Creepage distances and clearances between end-lead termination assemblies and dead-metal pa

34、rts or current-carrying parts shall comply with the spacing requirements of the end-product standard. PERFORMANCE 5 Discharge-Path Resistor Tests 5.1 Resistance test 5.1.1 The initial resistance of 20 as-received, discharge-path resistors is to be measured. The initial resistance of each resistor: a

35、) Shall be 480 k to 12 M for a resistor to be used in a 125 V or less circuit, or b) Shall be 960 k to 12 M for a resistor to be used in a 126 250 V circuit. 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 c

36、onditioning as described in 5.2.2. Within 5 minutes after the conditioning, the resistance of each resistor: a) Shall be 12 M 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

37、chamber maintained at 90 95 percent relative humidity. The chamber 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. MAY 30, 2017 UL 1676 6AUL COPYRIGHTED MATERIAL NO

38、T AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 30, 2017 UL 1676 6B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.3 Discharge test 5.3.1 Each resistor tested as specied in 5.1.1 5.

39、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 h after the conditioning: a) Shall be 12 M or less, and b) Shall be within 50 percent of the initial resistance measured.

40、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 the resistor leads. The interval between successive discharges is to be 5 s. Figure 5.1 illustrates the circuit to be used wh

41、en 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 generated text for gtxt. SEPTEMBER 1, 2000 UL 1676 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT

42、ION WITHOUT PERMISSION FROM UL Figure 5.1 Test circuit for discharge-path resistors V ac The supply source is to have: a) A potential as specied 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

43、, 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 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 i

44、nto 30 turns. The two coils are to be connected so that the magnetic ux is aiding, thereby producing an effective inductance and resistance of each coil of approximately 3 mH and 0.03 , respectively. R Resistor under test. S High-voltage switch. C d Dump capacitor having a capacitance value of 0.01

45、f. V dc 1 0k Vd cs o u r c eo fs u p p l y . MAY 30, 2017 UL 1676 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION 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 specie

46、d 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 M or less, and b) Shall be within 50 percent of the initial resistance measured. See 5.1.1. 5.4.2 The test potential applied to each resistor is to be 1000

47、V rms, sinusoidal, 60 Hz, and is to be applied across the resistor leads for 1 min. 5.4.3 The test potential is to be obtained from a transformer that provides a variable output voltage. The applied potential is to be increased at a uniform rate from zero to the specied test value within 5 s. A manu

48、al or automatic means shall be used to control the rate of rise. 5.4.4 The sensitivity of the test equipment is to be such that when a resistor having a value of 120,000 is connected across the output, the test equipment indicates that the resistor has performed as intended for any output voltage le

49、ss than the specied test voltage, and has not performed as intended for any output voltage equal to or greater than the specied test voltage. 5.4.5 In the event a resistor being tested dissipates more than rated power while the dielectric voltage-withstand potential is applied, cooling the resistor by articial means complies with the requirement. 6 Conductive-Path Resistor Tests 6.1 General 6.1.1 The initial resistance of 10 as-received,