1、BSI Standards Publication BS ISO 8820-1:2014 Road vehicles Fuse-links Part 1: Definitions and general test requirementsBS ISO 8820-1:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8820-1:2014. It supersedes BS ISO 8820-1:2008 which is withdrawn. The UK
2、participation in its preparation was entrusted to Technical Committee AUE/16, Datat Communication (Road Vehicles). A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contrac
3、t. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 81973 5 ICS 43.040.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the a
4、uthority of the Standards Policy and Strategy Committee on 31 December 2014. Amendments issued since publication Date Text affectedBS ISO 8820-1:2014 ISO 2014 Road vehicles Fuse-links Part 1: Definitions and general test requirements Vhicules routiers Liaisons fusibles Partie 1: Dfinitions et exigen
5、ces gnrales dessai INTERNATIONAL STANDARD ISO 8820-1 Fourth edition 2014-12-01 Reference number ISO 8820-1:2014(E)BS ISO 8820-1:2014ISO 8820-1:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may
6、 be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the
7、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 SwitzerlandBS ISO 8820-1:2014ISO 8820-1:2014(E)Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions .
8、1 4 Marking, labelling, and colour coding 3 5 Tests and requirements 3 5.1 General . 3 5.2 Voltage drop 3 5.3 Transient current cycling . 4 5.4 Environmental conditions . 4 5.5 Operating time rating 8 5.6 Current steps 8 5.7 Breaking capacity . 8 5.8 Strength of terminals . 9 6 Dimensions 10 ISO 201
9、4 All rights reserved iiiBS ISO 8820-1:2014ISO 8820-1:2014(E) 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 comm
10、ittees. 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
11、International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for th
12、e different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. I
13、SO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this doc
14、ument is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Tra
15、de (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electric and electronic requirements. This fourth edition cancels and replaces the third edition (ISO 8820-1:2008), which has been technica
16、lly 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 guidelines Part 3: Fuse-links with tabs (blade type) Type C (medium), Type E (high current) and Type F (miniature) Part 4: Fuse-link
17、s 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 SF30 and SF51 and test fixtures Part 6: Single-bolt fuse-links Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V Part 8: Fuse-links w
18、ith bold-in contacts (Type H and J) with rated voltage of 450 V Part 9: Fuse-links with shortened tabs (Type K) Part 10: Fuse-links with tabs Type L (high current miniature)iv ISO 2014 All rights reservedBS ISO 8820-1:2014Road vehicles Fuse-links Part 1: Definitions and general test requirements 1 S
19、cope This part of ISO 8820 defines terms and specifies general test requirements for fuse-links for electrical DC 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
20、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 documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, onl
21、y 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
22、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: A
23、brasion of markings and letterings caused by rubbing of fingers and hands 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8820-1 and the following apply. 3.1 breaking capacity I B value of prospective breaking current a fuse-link is capable of breaki
24、ng at rated voltage under prescribed conditions of use and behaviour 3.2 fuse protective device that interrupts the circuit irreversibly when the current flow reaches a specified value for a specific time Note 1 to entry: The fuse is an assembly of all parts forming the protective device. This inclu
25、des the fuse holder and the fuse-link. INTERNATIONAL ST ANDARD ISO 8820-1:2014(E) ISO 2014 All rights reserved 1BS ISO 8820-1:2014ISO 8820-1:2014(E) 3.3 fuse-element active part of the fuse-link which interrupts the current and opens the circuit permanently in case of an overcurrent 3.4 fuse holder
26、device connecting the fuse-link to the vehicle wiring harness 3.5 fuse-link interchangeable part of the fuse, consisting of an insulator and electrical conducting parts such as the terminals and the fuse element 3.6 insulator electrical non-conductive mechanical support for the electrical conductive
27、 parts of the fuse-link 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 3.8 operating time rating operating time, as a function of the current under defined test conditions 3.9 rat
28、ed current I R current used for identifying the fuse-link, according to specified tests 3.10 rated voltage U R maximum supply voltage for which the fuse-link is designed 3.11 selectivity primary interruption of the fuse-element closest to the failure cause without damaging of the upstream fuse-links
29、 3.12 terminal part of the fuse-link, that makes the mechanical and electrical connection of the fuse-link to the fuse holder Note 1 to entry: The terminal includes contacts and tabs. 3.13 time constant time required for a physical quantity to rise from 0 to 1 - 1/e (that is 63,2 %) of its final ste
30、ady value when it varies with time, t, as 1 - 1 -kt Note 1 to entry: The continuous current is lower than the rated current. 3.14 voltage drop U D voltage measured between specified measuring points at a specified current2 ISO 2014 All rights reservedBS ISO 8820-1:2014ISO 8820-1:2014(E) 4 Marking, l
31、abelling, 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 sha
32、ll 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
33、, 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
34、 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 app
35、ropriate 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 resistanc
36、e 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
37、 legible; the colour coding shall remain recognizable; after testing, 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. 5.2.2
38、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. ISO 2014 All rights reserved
39、3BS ISO 8820-1:2014ISO 8820-1:2014(E) 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.
40、2 Test Apply a pulse as given in the appropriate part of ISO 8820 (see Figure 1). 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 t
41、ime, in s a one cycle NOTE Specific values are given in the appropriate part of ISO 8820. Figure 1 Example of transient current cycling 5.4 Environmental conditions 5.4.1 Purpose These tests evaluate the ability of the fuse-links to function under environmental stresses.4 ISO 2014 All rights reserve
42、dBS ISO 8820-1:2014ISO 8820-1:2014(E) 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 th
43、e 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) mai
44、ntain 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;
45、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 might be interrupted. During the interruption,
46、the test samples shall remain at the standard conditions. Note the interruption in the test report. NOTE One cycle consists of 24 h. ISO 2014 All rights reserved 5BS ISO 8820-1:2014ISO 8820-1:2014(E) Key a 1 cycle = 24 h Y RH b (45 75)% RH T temperature in C c (95 100)% RH t time, in h Figure 2 Temp
47、erature/humidity cycling6 ISO 2014 All rights reservedBS ISO 8820-1:2014ISO 8820-1:2014(E) 5.4.3.1.2 Requirement After a minimum of 10 cycles, the fuse-links shall meet the requirements of the operating time rating test given in the applicable part of ISO 8820 and shall remain physically intact. 5.4
48、.3.2 Resistance against temperature shock 5.4.3.2.1 Test The fuse-links shall be subjected to 48 temperature shock cycles, as follows (see Figure 3). a) 20 min at a temperature of (-40 2) C; b) 15 s maximum transition time; c) 20 min at the temperature of (100 2) C; d) 15 s maximum transition time.
49、After completion of the test, the operating time-rating test shall be conducted according with 5.5. The cycle described in a) to d) above shall be completed in 40 min. Key X time, in min Y temperature, in C a one cycle Figure 3 Resistance against temperature shock 5.4.3.2.2 Requirement After the test, the fuse-links shall remain physically intact. 5.4.4 Chemical loads 5.4.4.1 Purpose This test evaluates the resistance to diesel fuel, “bio”
