ISO-8820-1-2008.pdf

Reference number ISO 8820-1:2008(E) © ISO 2008 INTERNATIONAL STANDARD ISO 8820-1 Third edition 2008-11-15 Road vehicles Fuse-links Part 1: Definitions and general test requirements Véhicules routiers Liaisons fusibles Partie 1: Définitions et exigences générales d'essai Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT © ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii © ISO 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) © ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions.1 4 Marking, labelling and colour coding3 5 Tests and requirements3 5.1 General .3 5.2 Voltage drop.3 5.3 Transient current cycling4 5.4 Environmental conditions 5 5.5 Operating time rating8 5.6 Current steps .8 5.7 Breaking capacity9 5.8 Strength of terminals 10 6 Dimensions 10 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) iv © ISO 2008 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8820-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. This third edition cancels and replaces the second edition (ISO 8820-1:2002), which has been technically revised. ISO 8820 consists of the following parts, under the general title Road vehicles Fuse-links: Part 1: Definitions and general test requirements Part 2: User's guide Part 3: Fuse-links with tabs (blade type) Part 4: Fuse-links with female contacts (type A) and bolt-in contacts (type B) and their test fixtures Part 5: Fuse-links with axial terminals (Strip fuse-links) Types SF 30 and SF 51 and test fixtures Part 6: Single-bolt fuse-links Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 8820-1:2008(E) © ISO 2008 All rights reserved 1 Road vehicles Fuse-links Part 1: Definitions and general test requirements 1 Scope This part of ISO 8820 defines terms and specifies general test requirements for fuse-links for electrical systems of road vehicles. This part of ISO 8820 is intended to be used in conjunction with other parts of ISO 8820, to which its requirements are applicable except where modified by the particular requirements of another part. This part of ISO 8820 is not applicable to fuse holders used in the vehicles. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6722, Road vehicles 60 V and 600 V single-core cables Dimensions, test methods and requirements ISO 8820 (all parts), Road vehicles Fuse-links ISO 16750-3, Road vehicles Environmental conditions and testing for electrical and electronic equipment Part 3: Mechanical loads ISO 16750-5, Road vehicles Environmental conditions and testing for electrical and electronic equipment Part 5: Chemical loads IEC 60068-2-70, Environmental testing Part 2: Tests Test Xb: Abrasion of marking and letterings caused by rubbing of fingers and hands 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 fuse protective device that interrupts the circuit irreversibly when the current flow reaches a specified value for a specific time NOTE The fuse is an assembly of all parts forming the protective device. This includes the fuse holder and the fuse- link. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) 2 © ISO 2008 All rights reserved 3.1.1 fuse holder device connecting the fuse-link to the vehicle wiring harness 3.1.2 fuse-link interchangeable part of the fuse, consisting of an insulator and electrical conducting parts such as the terminals and the fuse element 3.1.2.1 insulator electrical non-conductive mechanical support for the electrical conductive parts of the fuse-link 3.1.2.2 terminal part of the fuse-link that makes the mechanical and electrical connection of the fuse-link to the fuse holder NOTE The terminal includes contacts and tabs. 3.1.2.3 fuse-element active part of the fuse-link which interrupts the current and opens the circuit permanently in the case of an over current 3.2 rated current IR current used for identifying the fuse-link, according to specified tests NOTE The continuous current is lower than the rated current. 3.3 rated voltage UR maximum supply voltage for which the fuse-link is designed 3.4 voltage drop UD voltage measured between specified measuring points at a specified current 3.5 breaking capacity IB value of prospective breaking current a fuse-link is capable of breaking at rated voltage under prescribed conditions of use and behaviour 3.6 time constant time required for a physical quantity to rise from 0 to 1 1/e (i.e. 63,2 %) of its final steady value when it varies with time, t, as 1 1kt 3.7 operating time time between the application of an over current and the moment when the current drops below a value, as specified in the appropriate part of ISO 8820 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) © ISO 2008 All rights reserved 3 4 Marking, labelling and colour coding The rated current and rated voltage shall be permanently marked to be externally visible on the fuse-link. In addition, the current rating shall be shown by colour coding as specified in the applicable part of ISO 8820. The manufacturers name, trademark and/or symbol shall be marked on the fuse-link insulator. 5 Tests and requirements 5.1 General 5.1.1 General test conditions If not otherwise specified, all tests shall be done at room temperature (RT) (23 ± 5) °C, at a relative humidity (RH) of 45 % to 75 % (standard condition). At the beginning of the electrical tests, a direct current shall be fixed at the rated value. Measure this current with an appropriate method. If not otherwise specified, no further adjustments during the tests are allowed. All electrical measurement equipment shall have a tolerance of less than ± 2 %. If not otherwise specified, the supply voltage shall not exceed the rated voltage of the fuse-link. Mount the fuse-links in a test fixture as specified in the applicable part of ISO 8820, or any alternate fixture with equivalent electrical, mechanical and thermal properties. Measurements shall be performed at no forced air flow. For appropriate cable sizes, see the applicable part of ISO 8820. Connections shall be made to the fuse-links with copper cables according to ISO 6722. The cable length between the test fixture and the rest of the test set-up shall be (500 ± 50) mm, if not otherwise specified. Measure the connection resistance using a dummy with dimensions as specified in the appropriate part of ISO 8820. Use a current as specified in the appropriate part of ISO 8820 for this measurement. 5.1.2 General performance requirements The general performance requirements are as follows: the marking and/or labelling shall remain legible; the colour coding shall remain recognisable; after testing, the fuse-link shall be removable in one piece from the test fixture by its intended method. 5.2 Voltage drop 5.2.1 Purpose This test defines and measures the energy consumption of the fuse-link which creates a temperature rise. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) 4 © ISO 2008 All rights reserved 5.2.2 Test If not otherwise specified, this test shall be performed at rated current. Record the voltage drop measured at the points shown in the applicable part of ISO 8820, after the values are stabilized, i.e. the values do not change more than 2 % within a 10 min period. 5.2.3 Requirement The maximum voltage drop shall not exceed the values given in the applicable part of ISO 8820. 5.3 Transient current cycling 5.3.1 Purpose This test evaluates the ability of the fuse-link to withstand the energy volume of transient pulses. 5.3.2 Test Apply a pulse as given in the appropriate part of ISO 8820. 5.3.3 Requirement After transient current cycling for a minimum of 50 000 cycles, the fuse-links shall meet the requirements of the operating time rating test given in the applicable part of ISO 8820. Key I current t time, in s 1 one cycle Figure 1 Transient current cycling Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) © ISO 2008 All rights reserved 5 5.4 Environmental conditions 5.4.1 Purpose These tests evaluate the ability of the fuse-links to function under environmental stresses. 5.4.2 Mechanical load 5.4.2.1 Test If a mechanical load test is required, an appropriate test shall be chosen from ISO 16750-3 and agreed between fuse-link and vehicle manufacturer. 5.4.2.2 Requirement After the mechanical load test, the fuse-links shall meet the requirements of the operating time rating test given in the applicable parts of ISO 8820. 5.4.3 Climatic loads 5.4.3.1 Temperature/humidity cycling 5.4.3.1.1 Test Subject the fuse-links to a temperature/humidity cycling test as specified in Figure 2. The test sequence is as described below. a) Maintain the samples at standard conditions for 4 h. b) Increase t to (55 ± 2) °C at 95 % to 99 % RH within 0,5 h. c) Maintain t at (55 ± 2) °C at 95 % to 99 % RH for 10 h. d) Decrease t to (40 ± 2) °C within 2,5 h; the humidity is uncontrolled. e) Maintain t at (40 ± 2) °C for 2 h; the humidity is uncontrolled. f) Increase t to (120 ± 2) °C within 1,5 h from (40 ± 2) °C; the humidity is uncontrolled. g) Maintain t at (120 ± 2) °C for 2 h; the humidity is uncontrolled. h) Allow to return to RT within 1,5 h; the humidity is uncontrolled. At the end of a cycle, the test may be interrupted. During the interruption, the test samples shall remain at the standard conditions. Note the interruption in the test report. NOTE One cycle consists of 24 h. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 04:54:15 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 8820-1:2008(E) 6 © ISO 2008 All rights reserved Key t time, in h T temperature, in °C Y RH a One cycle is 24 h. b RH is between 45 % and 75 %. c RH is between 95 % and 100 %. Figure 2 Temperature/humidity cycling Copyright International Organization for Standardization Provided by IHS under licen