UL 141421.docx

1、UL 141421June 1 1994 1 UL1414Standard for Across- the- line,Antenna-Coupling and Line-by-pass Capacitors for Radio- and Television Type Appliances Fifh EditionApproval as an American National Standard (ANSI ) covers the numbered paragraphs on pages dated June 1 1994.These pages should not be discard

2、ed when revised or additional pages are issued if it is desired to retain the ANSI approved text.An effective date included as a note immediately following certain requirements is one established by UL Approved as ANSI /UL 1414 1978,July 17 1978Approved as ANSI /UL1414 1983 ,March 17 ,1983Approved a

3、s ANSI /UL 1414 1988,October 6,1988Approved as ANSI /UL 1414-1994 February 14,1994Revisions of this standard will be made by issued revised or additional pages bearing their date of issue .A UL Standard is current only if it incorporates the most recently adopted revision, all of which are itemized

4、on the transmittal notice that accompanies the latest published set of revision pagesISBN 1-55989-570-5 Copyright 19751994 UNDERWRITERS LABORTORIES INC.CONTENTSFOREWORD INTRODUCTION 1 SCOPE5 2 Terminology 5 3 Glossary5 4 Reference.5 5 Units of Measurement.5CONSTRUCTION 6 Enclosure .6 7 Sleeving ,Tap

5、e ,Tubling and wire insulation6 8 Spacings6PERFORMANCE ALL CAPACITORS 9 Capacitor Flammability Test.8 10 Dielectric Voltage-withstand Test .8ANTENNA- COUPLING CAPACITOR 11General 9ACROSS-THE-LINE CAPACITOR 12 General9 13 Discharge test .9 14 Life test .13LINE-BY-PASS CAPACITOR 15 General .14 16 Disc

6、harge test14 17 Life test .16DOUBLE-PROTECTION CAPACITORS 18 General .16 19 Across-the-line discharge test16 20 Across- the- line life test.17 21 Antenna-coupling discharge test 18 22 Antenna-coupling life test.19MANUFACTURING AND PRODUCTION TESTS 23Dielectric Voltage-withstand.19 24 Capacity measur

7、ement.22MARKING 25 Details.22FOREWORDA. This standard contains basic requirements for products covered by UL under its Follow-Up service for this category with the limitations given below and in the scope section of this standard .These requirements are based upon sound engineering principles, resea

8、rch ,records of test and field experience ,and an appreciation of the problems of manufacture,installation,and use derived from consultation with and information obtained from manufactures, users,inspection authorities ,and other having specialized experience.They are subject to revision as further

9、experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the condition of the continued coverage of the manufacturers product.C. A product which complies with the text of this Standard will not necessary be ju

10、dged to comply with the Standard if ,when examined and tested ,it is found to have other features which impair the level of safety contemplated by these requirements.D. A product employing materials or having forms of construction differing from those detailed in the requirement of this standard may

11、 be examined and tested according to the intent of the requirement and ,if found to be substantially equivalent, may be judged to comply with the Standard.E. UL. In performing its functions inaccordance with its objectives ,does not assume or undertake to discharge any responsibility of the manufact

12、urer or any other party. The opinions and findings of UL represent its professional judgment given with due consideration to the necessary limitations of practical operation and state of the art at the time the standard is processes. UL shall not be responsible to anyone for the use of or reliance u

13、pon this Standard by anyone. UL shall not incur any obligation or liability for damages ,including consequential damages ,arising out of or in connection with the use,interpretation of or reliance upon this Standard.F. Many tests required by the standard of UL are inherently hazardous and adequate s

14、afeguards for personnel and property shall be employed in conducting such tests.INTRODUCTION1 Scope 1.1 These requirements cover capacitors rated not more than 1.0 microfarad,85 250 voltages,and 60hertz that are employed in radio ,television receiving,and similar appliance circuit where breakdown of

15、 the capacitor may result in a risk of fire ,electic shock ,or injury to persons. 1.2 These requirements also cover double protection capacitors rated more than 1.0 microfarad,85,125Voltages,and 60 hertz that are employed in video ,television receiving,and similar appliance circuits where breakdown

16、of the capacitor may result in a risk of fire ,electic shock ,or injury to persons. 1.3 A product that contains features characteristics, components,materials or systems new or diffient from those in use when the standard was developed ,and that involves a risk of fire electric rock,or injury to per

17、son shall be evaluated using the appropriate additional component and end- product requirements as detemined necessary to maintain the level of safety for the user of the product as originally anticipated by the intent of this Standard.2 Terminology 2.1 For the purpose of these requirements ,the ter

18、m capacitor also refers to combinations of capacitor and resistors.3 Glossary 3.1 ACROSS-THE LINE CAPACITOR- A capacitor that is connected either across a supply circuit or between one side of a supply circuit and conductive part that may be connected to the earth ground. 3.2 Antenna-coupling capaci

19、tor A capacitor that is connected from an antenna terminal to circuit within an appliance. 3.3 Double-protection capacitor A capacitor that provides protection against the risk of electric shock in accordance with the requirements for double protection in the standard for television receivers and hi

20、gh-voltage video produce,UL1410. 3.4 LINE-BY-PASS CAPACITOR A capacitor that is connected between one side of a supply circuit and an accessible conductive part.4 references 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referri

21、ng to the latest edition of that code or standard5.Units of measurement5.1 If a value for measurement is followed by a value in other units in parentheses ,the second value may be only approximate.The first state value is the requirement.CONSTRUCTION6 Enclosure6.1 A nonmetallic material used as all

22、or part of the enclosure of a capacitor shall either: a) Be classified 94V-0 as the determined by the test described in the standard for test for flammability of plastic Materials for parts in devices and appliances,UL 94, orb) Perform acceptably when tested in accordance with capacitor flammability

23、 test, section9. 6.2 A material classified 94V-0 or better using 1/16-inch (1.6mm)thick flat-stock samples may be used in lesser thickness7 Sleeving ,Tape, Tuping and Wire insulation 7.1 Sleeving ,tape,tubing and wire insulation shall be rated for the voltage involved and the temperature attained un

24、der any condition of actual use.Tape shall be flame-retardant .Sleeving ,tubing,and wire insulation shall have a flame retardant rating VW-18 Spacings 8.1 General 8.1.1 The spacing between uninsulated live parts of opposite polarity,and between an uninsulated live part and a dead metal part ,shall n

25、ot be less than the applicable value specified in table 8.1 Table 8.1 spacingsCapacitor rating voltsMinimum spacing through air and over surface ,inch(mm)125 or less 1/16(1.6)125 to 2501/8(3.2) 8.2 Double-protection capacitor 8.2.1 The spacing between uninsulated live parts of opposite polarity,and

26、an uninsulation live part and a dead metal part shall not be less than 1/8inch(3.2mm) over surface or through air . 8.2.2 The spacing between uninsulationed live part of the same polarity but of a different potential shall not be less than 1/16inch(1.6mm) over surface or through air, see figure 8.1.

27、Figure8.1Polaritles in double-protection capacitorsleaderEnlosureDCBAFor the purpose of judging spacings in doule-protection capacitors:a) Capacitor elements A and D are considered to be at opposite polarity and b) Capacitor elements A and B ,C and D ,A and C,and B and D are considered to be at diff

28、erent potiential but of the same polarity.PERFORMANCEALL CAPACITORS9 Capacitor Flammability Test 9.1 IF a nonmetallic capacitor enclosure material is not classified 94V-0 ,three samples of the capacitor shall be subjected to three 15 -second applications of a test flame,the period between applicatio

29、ns of the flame being 15 seconds.The material of the enclosure is acceptable if each capacitor does not continue to flame for more than 15 seconds after the first and second applications, and for not more than 60 seconds after the third application . 9.2 For the test required by 9.1,a supply of gas

30、having heating value of approximately 1000 btu per cubic foot(37.6MJ/m3 ) at normal pressure and 3/8 inch (9.5mm)diameter thrill burner are to be used. The test flame is to be 3/4 inch (19mm) high with air ports of the burner closed. 9.3 Each capacitor is to be mounted in a position that is most con

31、ductive to the ignition of the capacitor and which is permitted by the physical condstruction of the capacitor .The tip of the test flame is to be applied at any location on the body of each capacitor. 10 Dielectric Voltage-withstand test 10.1 As received samples10.1.1 Ten capacitors shall withstand without indication of unacceptable performance for 1 minute a sinusoidal potential,having a frequency of 60 hertz,applied from lead to lead .The potential shall be 1250 volts rms for capacitors rated up to 125 volts, and 1500 Vrms for capacitors rated 126250 v