इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 13703-2-2 (1993): Low-voltage fuses for voltages not exceeding 1 000 V AC or 1 500 V DC, Part 2: Fuses for use by authorized persons, Section 2: Examples of standardized fuses [ETD 39: Fuses] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 13703 ( Part 2/Set 2 ) : 1993 IEC Pub 269-2-l ( 1987 ) LOW VOLTAGE FUSES FOR VOLTAGE NOT EXCEEDING 1000 V AC OR 1500 V DC - SPECIFICATION PART 2 FUSES FOR USE BY AUTHORIZED PERSONS Section 2 Examples of Standardized Fuses UDC 62 l-3 16.923.027~3 @ BIS 1993 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 enuJ 3991 Prioe Gronp 14 (30731SI teS/2 34!91:)2 Part CEI Pnb 269-2-l ( 1987 ) Indian Standard LOW VOLTAGE FUSES FOR VOLTAGE NOT EXCEEDING 1OOOV AC OR 15OOV DC- SPECIFICATION PARl- 2 FUSES FOR USE BY AUTHORIZED PERSONS Section 2 Examples of Standardized Fuses NATIONAL FOREWORD This Indian Standard ( Part 2/Set 2 ) which is identical with IEC Pub 269-2-1 issued by the International Electrotechnical Commission ( IEC ) is being brought out to align the standardized designs of industrial fuses with the corresponding designs at the IEC level. The text of the IEC standard has been considered and approved by ETD 39, Fuses Sectional Committee of BIS as suitable for publication as Indian Standard. This Section together with Section 1 of this part supersedes IS 9224 ( Part 2 ). CROSS REPERENCES The Technical Committee responsible for the preparation of this standard has decided that IEC Pub 685-2-2 ( 1983 ) quoted in this standard is acceptable for use with this Indian Standard. NATIONAL ANNEX Keeping in view the use of this standard in Indian conditions, the technical committee responsible for this standard has felt the need to provide elaboration and interpretation where felt necessary. These are summarized in a national annex. The text of this standard shall be read in conjunction with this annex which is an integral part of it. As in the Original Standard, this Page is Intentionally Left Blank IS 13703 (Part t/Set 2) : 1993 IEC Pub 269-2-l (1987) CONTENTS EXPLANATORYNOT. E. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ClaUU General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SECTION I - FUSESW ITH FUSE-LINKS WITH BLADE CONTATACTS 1.1 scope ........................................................... 5 5.2 Rated voltage ....................................................... 5 5.3.1 Rated current of the fuse-link ............................................. 5. 5.3.2 Rated current of the fuse-holder ........................................... 6 5.5 Rated power dissipation of a fuse-link and rated power acceptance of a fuse-holder .............. -6 5.6 Limits of time-current characterisiics ......................................... 6 5.6.1 Time-current characteristics, time-current zones and overload curves ....................... 56.2 Conventional times and currents ........................................... 2 56.3 Gates .......................................................... 6 Marking....................‘.................... 6 6.1 &kings of fuse-holders ........................................ 7 6.2 Markings of fuse-links .......................................... . . 7 7.1 Mechanical design ............................................ . . . . -7 7.1.2 Connections including terminals ...................................... . . . . 7 7.1.3 Fuse-contacts ............................................... . . . . . 7 7.1.7 Construction of a fuse-link ....................................... . . . . 8 7.7 1% characteristics. ............................................ . . . . 8 7.8 Over-current discrimination of ‘gG” fuse-links ............................ . . . . 8 7.9 Protection against electric shock ................................... . . . 9 8.1.6 Testing of fuse-holders .......................................... . . . . 9 8.3 Verification of temperature rise and power dissipation ........ i ............... . . . . 9 8.3.1 Arrangement of the fuse ......................................... . . . . 9 8.7.4 Verification of overcurrent discrimination ............................... . . . . 10 8.9 Verification of resistance to heat .................................... . . 11 8.9.1 Fuse-base ................................................. . . 11 8.9.2 Fuse&&s with gripping lugs of moulded material or of metal fixed in moulded material ..... . . 12 8.11 Mechanical and miscellaneous tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 16 RGURss.................................................... SECTIONI I - FUSESW ITH FUSELINKS FOR BOLTEDCONNECTIONS 11 scope .......................................................... 27 5.3.1 Rated current of the fuse-link ............................................. 27 5.3.2 Rated current of the fuse-holder ............................................ 27 5.5 Rated power dissipation of a fuse-link and rated power acceptance of a fuse-holder .............. 27 5.6 Limits of time-current characteristics ........................... . . , . . . . 27 56.1 Time-current characteristics, time-current zones and overload curves ......... . . . . . . . 27 5.6.2 Conventional times and currents .......................... ... . . . . . . . 27 5.6.3 Gates ............................................ . . . . . . . 27 5.7.2 Rated breaking capacity ............................... ... . . . . . . . 28 7.1 Mechanical design ..................................... . . . . . . . .28 7.1.2 Connections including terminals ............................. . . . . . . . 28 7.9 Protection against electric shock .......................... ... . . . . . . . 28 8.3 Verification of temperature rise and power dissipation .............. ... . . . . . . . 28 8.3.1 Arrangement of the fuse .................................. . . . . . . . 28 8.3.3 Measurement of the power dissipation of the fuse-link ................. . . . . . . . 28 8.4 Verification of operation ................................. . . . . . . . 28 8.4.1 Arrangement ofthe fuse ............................... ... . . . . . . . 28 8.5 Verification of breaking capacity .......................... ... . . . . . . . 28 8.5.1 Arrangement of the fuse ............................... ... . . . . . . . 28 8.5.8 Acceptability of test results ............................. ... . . . . . . . 28 RGUREs .................................................... 30 3 30731SI )2ceS/ZtraP( 3991: CEI buP )7891(l.2-962 SECTION III - Fustzs WITH FUSE-LINKS HAVING CYLINDRICAL CONTACT CAPS 1.1 Scope .................................................. . 40 5.2 Rated voltage .............................................. . 40 5.3.1 Rated current of the fuse-link ..................................... . . . 40 5.3.2 Rated current of the fuse-holder ................................... . . . 40 5.5 Rated power dissipation of a fuse-link and rated power acceptance of a fuse-holder ...... 40 5.6 See Section I, Sub-clause 5.6 . . . . . . 41 6. See Section I, Clause 6 . . . . . . . . . . . . . . 7.1 Mechanical design . . . . . . . . . . . . 4”: 7.1.2 Connections including terminals . . . . . . . . . 41 7.7 See Section I, Sub-clause 1.7 . . . . . . . . . . . 41 7.8 See Section I, Sub-clause 7.8 . . . . . . . . . . . . . 41 7.9 See Section I, Sub-clause 7.9 . . . . . . . . . . . . 41 8.1.6 See Section I, Sub-clause 8.1.6 . . . . . . . . . 41 8.3.1 Arrangement of the fuse . . . . . . . . . . . . 41 8.7.4 See Section I, Sub-clause 8.7.4 . . . . . . . . 42 FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4 IS 13703 (Part 2ISec 2) : 1993 IEC Pub 269-2-l (1987) EXPLANATORY NOTE In view of the fact that this standard should be read together with IEC Publications 269-I and \ 269-2 the numbering of its clauses and sub-clauses are made to correspond to these publications. Regarding the tables, their numbering also corresponds to that of IEC Publication 269-l; however,’ when additional tables appear they are referred to by capital letters, for example, Table A, Table B, etc. 1. General Fuses for use by authorized persons according to the following sections shall also comply with all sub-clauses of: IEC Publication 269- 1: Low-voltage fuses, Part 1: General requirements, and IEC Publication 269-2: Low-voltage fuses, Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial applications). This standard is divided into three sections, each dealing with a specific example of.stan- dardized fuse for use by authorized persons: Section I: Fuses with fuse-links with blade contacts. Section II: Fuses with fuse-links for bolted connections. Section III: Fuses with fuse-links having cylindrical contact caps. Abe. - The following fuse systems are standardized systems in respect to their safety aspects. The National Committees may select from the examples of standardized fuses one or more systems for their own standards. SECTION I: FUSES W ITH FUSE-LINKS WITH BLADE CONTACTS 1.1 Scope The following additional requirements apply to fuses with fuse-links having blade contacts intended to be replaced by means of a device, for example replacement handle, which complies with the dimensions specified in Figures l(I*) and 2(1*), pages 28 and 30. Such fuses have rated currents up to and including 1 250 A and rated voltages up to and including 660 V a.c. or 440 V d.c. 5.2 Rated voltage For a.c. the standard values of rated voltage are 500 V or 660 V. For d.c. the rated voltage is 440.v. 5.3.1 Rated current of the fuse-link For each size the maximum rated currents are given in Figure l(I). These values depend upon the utilization categories and rated voltages. * Refers to Section I. ( IEC page 9 f IS 13703 (PartZ/Sec 2) :1993 IEC Pub 269-2-l(1987) 5.3.2 Ratedcurrento ft/refuse-holder The rated current for the different sizes of the fuse-bases is given in Figure 2(I), page 30. 5.5 Rated power dissipation of a fuse-link and rated power acceptance of a fuse-holder The maximum values of rated power dissipation for the different sizes of fuse-links are specified in Figure l(1). The values apply to the maximum rated currents’of the fuse-links. The values of rated power acceptance of fuse-bases are given in Figure 2(I). 5.6 Limits of time-current characteristics 5.6.1 Time-current characteristics, time-current zones and overload curves The tolerance on time-current characteristics given by the manufacturer shall not deviate by more than f 10 % in terms of current. The time-current zones given in Figures 4(I), page 33, including manufacturing tolerances shall be met by all pre-arcing and total times measured at the test voltage according to Sub-clause 8.7.4. 5.6.2 Conventional times and currents The conventional times and currents, in addition to the values of IEC Publication 269-1, are given in Table II. TABLE I I Conventional time and currentfor “gG”fuse-links with rated current lower than 16 A Rated current In Conventional time Conventional current (A) (h) In r lr I”54 I 5.1 ”I 1.2 ”I 4<1,<16 I 1.5 1” 1.9 I, 5.6.3 Gates For “gG” fuse-links the gates given in Table III apply, in addition to the gates of IEC Publi- cation 269- 1. TABLE III Gates for specified pre-arcing and operating times of UgG“ fuse-links with rated current < 16 A I” Anin(lOS) hl&3r (5 s) Lin (0-l S) Allax (0.1 9) (4 (4 (4 (A) (4 6. Marking Fuse-links and fuse-holders which meet the requirements and tests of Section I of this standard may be marked with 269-2- 1. ( IEC page 11)