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1、BRITISH STANDARD BS CECC 31500:1982 Harmonized system of quality assessment of electronic components Sectional specification: Fixed ceramic capacitors of dielectric class 2, for electrical shock hazard protection UDC 621.319.4-784.37 Licensed Copy: London South Bank University, London South Bank Uni
2、versity, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 198
3、2 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 78/20793 DC ISBN 0 580 12925 X Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of re
4、presentatives from the following: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Electronic Engineering Association* Institution of Electronic and Radio Engineers National Supervising Inspec
5、torate* Post Office* Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association (TEMA) The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the pr
6、eparation of this British Standard: British Broadcasting Corporation Electrical Research Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c)
7、 BSI BS CECC 31500:1982 BSI 10-1999i Contents Page Cooperating organizationsInside front cover National forewordii Forewordiii Text of CECC 315001 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006,
8、Uncontrolled Copy, (c) BSI BS CECC 31500:1982 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is identical with CENELEC Electronic Components Committee (CECC) 31500 “Harmonized system of quality assessm
9、ent for electronic components. Sectional specification: Fixed ceramic capacitors of dielectric class 2, for electrical shock hazard protection”. This standard is a harmonized specification within the CECC system. Terminology and conventions. The text of the CECC specification has been approved as su
10、itable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current
11、practice to use a full point on the baseline as the decimal marker. Cross-references. The British Standard harmonized with CECC 00100 is BS 9000 “General requirements for a system for electronic components of assessed quality” Part 1: “Specification of basic rules and procedures”. IEC 65:1976, which
12、 is referred to in 1.1 and 1.2 for information, is related to BS 415:1979 “Specification for safety requirements for mains-operated electronic and related apparatus for household and similar general use”. Clause 14.2 of IEC 65, which is referred to in particular, is identical to 14.2 in the British
13、Standard. International StandardCorresponding British Standard CECC 30000:1975BS E9070:1975 Harmonized system of quality assessment for electronic components: Generic specification for fixed capacitors (Identical) CECC 30700:1979BS CECC 30700:1980 Harmonized system of quality assessment for electron
14、ic components. Sectional specification: Fixed capacitors with ceramic dielectric, class 2 (Identical) IEC 62:1974BS 1852:1975 Marking codes for resistors and capacitors (Identical) IEC 63:1963BS 2488:1966 Schedule of preferred numbers for the resistance of resistors and the capacitance of capacitors
15、 for telecommunication equipment (Technically equivalent) BS 2011 Basic environmental testing procedures IEC 68-1:1978Part 1.1:1980 General (Identical) IEC 68-2-20:1979Part 2.1T:1981 Test T. Soldering (Identical) IEC 68-2-21:1975Part 2.1U:1977 Test U. Robustness of terminations and integral mounting
16、 devices (Identical) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 BSI 10-1999iii The reference to IEC 384-14, for which there is no corresponding British Standard, is for information only.
17、 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises
18、 a front cover, an inside front cover, pages i to iv, the CECC title page, pages ii to iv, pages 1 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside f
19、ront cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Lic
20、ensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 ii BSI 10-1999 Contents Page Forewordiii Section 1. General 1.1Scope1 1.2Related documents1 1.3Terminology1 1.4Marking1 Section 2. Ratings and cha
21、racteristics 2.1Climatic categories2 2.2Rated temperature2 2.3Rated voltage2 2.4Category voltage2 2.5Rated capacitance2 2.6Tolerance on rated capacitance2 2.7Maximum current2 Section 3. Quality assessment procedure 3.1Primary stage of manufacture3 3.2Certified test records3 3.3Qualification approval
22、3 3.4Quality conformance inspection3 Section 4. Test and measurement procedures 4.1Standard atmospheric conditions8 4.2Visual inspection and check of dimensions8 4.3Capacitance8 4.4Tangent of loss angle8 4.5Insulation resistance8 4.6Voltage proof9 4.7Tests of Groups 1a and C1a9 4.8Tests of Groups 1b
23、 and C1b9 4.9Climatic sequence10 4.10 Test Ca: Damp heat, steady state11 4.11 Endurance11 4.12 Maximum current test12 4.13 Surge12 Appendix A Test circuit of surge test13 Table 1 Test schedule for qualification approval5 Table 2 Lot-by-lot tests6 Table 3 Periodic tests7 Licensed Copy: London South B
24、ank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 BSI 10-1999iii Foreword The CENELEC Electronic Components Committee (CECC) is composed of those member countries of the European Committee for Electrotechnical Standardizat
25、ion (CENELEC) who wish to take part in a harmonized System for electronic components of assessed quality. The object of the System is to facilitate international trade by the harmonization of the specifications and quality assessment procedures for electronic components, and by the grant of an inter
26、nationally recognized Mark, or Certificate, of Conformity. The components produced under the System are thereby accepted by all member countries without further testing. This specification has been formally approved by the CECC, and has been prepared for those countries taking part in the System who
27、 wish to issue national harmonized specifications for FIXED CERAMIC CAPACITORS OF DIELECTRIC CLASS 2, FOR ELECTRICAL SHOCK HAZARD PROTECTION. It should be read in conjunction with document CECC 00100: Basic Rules 1974). Preface This sectional specification was prepared by CECC Working Group 3: “Capa
28、citors”. It is one of a series of sectional specifications all relating to the generic specification CECC 30000. In accordance with the requirements of document CECC 00100 it is based, wherever possible, on the Recommendations of the International Electrotechnical Commission. As there are more than
29、nine sectional specifications related to CECC 30000: Generic Specification, Fixed Capacitors, the CECC Management Committee decided that these extra specifications should be numbered in the series 31100, 31200, 31300 etc. There is no generic specification numbered 31000. This specification is an exa
30、mple of this extended numbering series. It is based on CECC 30000 and all clauses etc. cross references are based on this generic specification. The text of this specification was circulated to the CECC for voting in the documents listed below and was ratified by the CECC Management Committee for pr
31、inting as a CECC Specification: DocumentVoting dateReport on the Voting CECC(Secretariat)944 March 1980CECC(Secretariat)1024 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South
32、Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 BSI 10-19991 Section 1. General 1.1 Scope This specification relates to fixed ceramic capacitors of dielectric class 2 for shock hazard protection used in mains operated e
33、lectrical and electronic equipment such as given in IEC 65, Clause 14.2. These capacitors offer protection against mains originated electrical shock hazard. They are not necessarily able to withstand voltages in an aerial arising from lightning. This specification does not cover chip capacitors. Rad
34、io interference suppression capacitors are not covered by this document, but by IEC 384-14. 1.2 Related documents The following documents and any other documents to which they may relate are mandatory unless otherwise stated. 1.3 Terminology See 2.2 of CECC 30000 with the following additional defini
35、tions: 1.3.1 Ceramic capacitors, dielectric class 2 A ceramic capacitor of dielectric class 2 with a high permittivity is a capacitor suited for by-pass and coupling applications or for frequency discriminating circuits where low losses and high stability of capacitance are not of major importance.
36、The ceramic dielectric is characterized by the maximum change of capacitance in % over the category temperature range with respect to the capacitance at 20 C. 1.3.2 Sub-class (for information only, not applicable for shock hazard protection purpose) A sub-class is defined by the maximum percentage c
37、hange of capacitance within the category temperature range with respect to the capacitance at 20 C. The sub-class may be expressed in code form. 1.4 Marking The following marking information, in the order of importance given below, is required: 1) Rated capacitance and tolerance on rated capacitance
38、 in clear or in code according to IEC 62 2) Rated voltage 3) Manufacturers name or trade-mark 4) Year and month (or week) of manufacture in code form according to IEC 62 5) Climatic category 6) Manufacturers type designation 7) Reference to the national or CECC number of the detail specification. Th
39、e capacitors shall be marked with rated capacitance and with as many as possible of the remaining items as is considered useful. This is not applicable to non-encapsulated capacitors.1) The package containing the capacitors shall be clearly marked with all the information above. Any additional marki
40、ng shall be applied so that no confusion can arise. CECC 30000(1975)Generic Specification: Fixed Capacitors IEC 65(1976)Safety requirements for mains operated electronic and related apparatus for household and similar use. IEC 62(1974)Marking codes for resistors and capacitors. 1) Any duplication of
41、 information on the capacitor shall be avoided. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 31500:1982 2 BSI 10-1999 Section 2. Ratings and characteristics 2.1 Climatic categories The capacitors cov
42、ered by this specification are classified into climatic categories according to the general rules given in IEC 68-1. The severities for the cold, dry heat and damp heat (steady state) tests for the capacitors covered by this document shall be within the following ranges: Values selected within these
43、 ranges shall be chosen from those listed in IEC 68-2. The severities for the cold and dry heat tests are the lower and upper category temperature respectively. 2.2 Rated temperature For capacitors covered by this specification the rated temperature is the upper category temperature. 2.3 Rated volta
44、ge (UR) The standard value of rated voltage is 250 V r.m.s. 2.4 Category voltage (UC) Since the rated temperature is defined as the upper category temperature, the category voltage is equal to the rated voltage. 2.5 Rated capacitance (CR) Preferred rated capacitance values shall be taken from the E3
45、, E6 and E12 series of IEC 63. 2.6 Tolerance on rated capacitance Standard values of rated capacitance tolerance are given in the table below: 2.7 Maximum current The 50 Hz current through class 2 ceramic capacitor has a non-linear dependence on temperature and applied voltage. In order to satisfy e
46、quipment safety requirements for a maximum 50 Hz leakage current from phase to earth it is necessary to specify a maximum current for each capacitor. The test method will be found in 4.12. Lower category temperature : 55 C to 10 C Upper category temperature :+ 70 C to + 125 C (the detail specificati
47、on may prescribe an upper category temperature 125 C). Damp heat, steady state :21 and 56 days. SeriesTolerances % E 3 AND E 6 20/+ 80 20/+ 50 20 10 E 12 10 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CE
48、CC 31500:1982 BSI 10-19993 Section 3. Quality assessment procedure 3.1 Primary stage of manufacture The primary stage of manufacture is the metallizing of the dielectric to form the electrodes. 3.2 Certified test records When certified test records are prescribed in the detail specification, the inf
49、ormation required in 3.6 of CECC 30000, Generic Specification: Fixed Capacitors, shall be made available when requested by a purchaser. After the endurance test the parameters for which variables information is required are capacitance change, tan $ and insulation resistance. 3.3 Qualification approval 3.3.1 Sampling The sample shall be representative of the range of capacitance values of the style for which approval is sought. This may be the complete range or part of the range corresponding to the detail specification. The sample shall consist