1、BRITISH STANDARD BS ISO 8820-7:2007 Road vehicles Fuse-links Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V ICS 43.040.10 BS ISO 8820-7:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007 ISBN 978 0 58
2、0 50742 7 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 8820-7:2007. The UK participation in its preparation was entrusted to Technical Committee AUE/16, Electrical and electronic equipment. A list of organizations represented on this committee can
3、be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication A
4、md. No. Date Comments Reference number ISO 8820-7:2007(E)INTERNATIONAL STANDARD ISO 8820-7 First edition 2007-04-15 Road vehicles Fuse-links Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V Vhicules routiers Liaisons fusibles Partie 7: Fusibles avec languettes (de type G) avec une t
5、ension nominale de 450 V BS ISO 8820-7:2007ii iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Marking, labelling and colour coding . 2 5 Tests and requirements . 2 5.1 General. 2 5.2 Voltage drop 4 5.3 Transient current cycling. 5 5.4 Environmental c
6、onditions 5 5.5 Operating time rating 5 5.6 Current steps. 6 5.7 Breaking capacity . 6 5.8 Terminal strength 6 6 Dimensions and designation examples .7 6.1 Types 7 6.2 Fuse-links with I R 35 A 8 6.3 Fuse-links with I RW 35 A . 9 6.4 Designation example 9 7 Test fixture. 10 7.1 Test fixture for fuse-
7、links with I R 35 A. 10 7.2 Test fixture for fuse-links with I RW 35 A 12 Bibliography . 14 BS ISO 8820-7:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
8、 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 p
9、art 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
10、 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 t
11、hat 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 8820-7 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. ISO 8820 co
12、nsists of the following parts, under the general title Road vehicles Fuse-links: Part 1: Definitions and general test requirements Part 2: Users 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
13、 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 BS ISO 8820-7:20071 Road vehicles Fuse-links Part 7: Fuse-links with tabs (Type G) with rated voltage of 450
14、 V 1 Scope This part of ISO 8820 specifies fuse-links with tabs (Type G) in road vehicles. This type of fuse-link is basically designed for use in fuel-cell applications. This part of ISO 8820 establishes, for this fuse-link type, the rated current, test procedures, performance requirements and dime
15、nsions. This part of ISO 8820 is applicable for fuse-links with a rated voltage of 450 V, a current rating of u 70 A and a breaking capacity of 2 000 A intended for use in road vehicles at a nominal voltage up to 450 V. This part of ISO 8820 is intended to be used in conjunction with ISO 8820-1: 1)a
16、nd ISO 8820-2. The numbering of its clauses corresponds to that of ISO 8820-1: 1) , the requirements of which are applicable except where modified by requirements particular to this part of ISO 8820. 2 Normative references The following referenced documents are indispensable for the application of t
17、his 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 8092-1, Road vehicles
18、Connections for on-board electrical wiring harnesses Part 1: Tabs for single-pole connections Dimensions and specific requirements ISO 8820-1: 1) , Road vehicles Fuse-links Part 1: Definitions and general test requirements 3 Terms and definitions For the purposes of this document, the terms and defi
19、nitions given in ISO 8820-1: 1)apply. 1) To be published. (Revision of ISO 8820-1:2002) BS ISO 8820-7:20072 4 Marking, labelling and colour coding The requirements given in ISO 8820-1: 1)and in Table 1 of this part of ISO 8820 apply. Table 1 Fuse-link colour coding Fuse-link rating A Colour 10 red 1
20、5 blue 20 yellow 25 white (natural) 30 green 35 dark green 40 orange 50 red 60 blue 70 brown 5 Tests and requirements 5.1 General In addition to carrying out the test procedures in accordance with ISO 8820-1: 1) , the following criteria apply. Tests shall be performed following the test sequence in
21、Table 2. The test fixtures for electrical tests shall be designed in accordance with Figures 3 and 4. The connection resistance shall be u 1,0 m to ensure the proper function of the test fixture. As two or more fuse-links are tested in series, they shall be mounted not less than 150 mm apart. BS ISO
22、 8820-7:20073 5.1.1 Test sequence Table 2 Test sequence Sample group No. Test Clause 1 2 3 4 5 6 1 Dimensions 6 X X X 2 Marking, labelling and colour coding 4 X X X X X X 3 Fuse-link voltage drop 5.2 X X X 4 Strength of terminals 5.6 X X X 5 Accelerated ageing X 6 Fluid compatibility X 7 Vibration 5
23、.4 X 8 Transient current cycling 5.3 X 9 Fuse-link voltage drop 5.2 X X X X 2I RY Y Y Y Y 300 A Y Y Y Y Y 10 Operating time rating 2 000 A a5.5 Y Y Y Y Y 11 Strength of terminals 5.8 X X X X X X aThis current is used to test the breaking capacity (see 5.5 and 5.7). Y For these operating time tests,
24、the sample groups 2, 3, 4, 5 and 6 shall be divided equally. These fuses are intended to be subjected to a single operating time test only. 5.1.2 Test cable sizes Test cable sizes shall be as given in Table 3. All tests for a particular fuse-link rating shall be performed using the same cable size.
25、Test cable sizes are specified to allow comparative fuse-link tests to be carried out. The cable size specified does not necessarily indicate the size of cable to be used in the vehicle application. Only thick-wall cables as specified in ISO 6722 shall be used for testing. BS ISO 8820-7:20074 Table
26、3 Test cable sizes Fuse-link rating Conductor cross-sectional area aA mm 210 1,0 15 1,5 20 25 2,5 30 35 4 40 50 10 60 10 70 16 aConductor material according to ISO 6722. 5.2 Voltage drop 5.2.1 Test The fuse-link voltage drop U abshall be measured at points a and b across the fuse-link tabs, as shown
27、 in Figure 5, or U aband U cdshall be measured at points a, b and c, d across the fuse-link tabs, as shown in Figure 7. 5.2.2 Requirements Table 4 gives the voltage drop requirements. Table 4 Fuse-link voltage drop Fuse-link rating A Voltage drop V 1 2,000 5 0,400 10 0,200 15 0,190 20 0,175 25 0,140
28、 35 0,114 50 0,080 70 0,080 BS ISO 8820-7:20075 5.3 Transient current cycling 5.3.1 Test See Figure 1 and ISO 8820-1. At an elapsed time of 0,025 s on-time, the current shall fall to a value between 1,65I Rand 2,5I R . At no time shall the steady-state current fall below 0,9I R . Key I current I R t
29、 time s aOne cycle. b(5,6 6)I Rfor I R 5 A; (4,6 5)I Rfor I Ru 5 A. Figure 1 Transient current cycling 5.3.2 Requirement The requirements given in ISO 8820-1 apply. 5.4 Environmental conditions The tests and requirements given in ISO 8820-1: 1)apply. 5.5 Operating time rating 5.5.1 Test The tests gi
30、ven in ISO 8820-1: 1)apply. The rated voltage U Rshall be maintained for a period of at least 30 s after the fuse-link is activated. For breaking capacity, the time constant shall be 7,5 . 10 ms. BS ISO 8820-7:20076 5.5.2 Requirement The requirements given in ISO 8820-1 apply. The voltage during ope
31、ration of the fuse-link shall not exceed 2 000 V. See Tables 5 and 6. After activation, the current through the fuse-link shall not exceed 5 mA at the rated voltage of the fuse-link. Table 5 Operating time rating for fuse-links with I R 35 A Operating time s Test current min. max. 2I R20 200 300 A 0
32、 0,1 2 000 A a0 0,01 aThis current is used to test the breaking capacity. Table 6 Operating time rating for fuse-links I RW 35 A Operating time s Test current min. max. 2I R60 600 300 A 0 10 2 000 A a0 0,01 aThis current is used to test the breaking capacity. 5.6 Current steps This test does not app
33、ly to this type of fuse-link. 5.7 Breaking capacity The tests and requirements are given in 5.5. 5.8 Terminal strength 5.8.1 Test A force (F 1 , F 2 ) shall be applied to the tabs of the fuse-link in accordance with Table 7 and Figure 2. BS ISO 8820-7:20077 5.8.2 Requirement Table 7 Terminal push an
34、d pull forces Fuse-link rating Push (F 1 ) and pull (F 2 ) forces A N 35 90 1 W 35 90 1 (each tab) Key F 1push force F 2pull force Figure 2 Terminal push and pull forces 6 Dimensions and designation examples 6.1 Types Table 8 Types Fuse-link rating A Type in accordance with Figure 35 3 W 35 4 BS ISO
35、 8820-7:20078 6.2 Fuse-links with I R 35 A Dimensions in millimetres Figure 3 Fuse-links with I R 35 A BS ISO 8820-7:20079 6.3 Fuse-links with I RW 35 A Dimensions in millimetres Figure 4 Fuse-links with I RW 35 A 6.4 Designation example Designation of a fuse-link in accordance with this part of ISO
36、 8820 for a rated current of 25 A: Fuse-link ISO 8820 G 25 BS ISO 8820-7:200710 7 Test fixture 7.1 Test fixture for fuse-links with I R 35 A Key a, b measuring points for cold resistance Figure 5 Measuring points for fuse-links with I R 35 A BS ISO 8820-7:200711 Dimensions in millimetres Figure 6 Te
37、st fixture for fuse-links with I R 35 A BS ISO 8820-7:200712 7.2 Test fixture for fuse-links with I RW 35 A Key a, b and c, d measuring points for cold resistance Figure 7 Measuring points for fuse-links with I RW 35 A BS ISO 8820-7:200713 Dimensions in millimetres Figure 8 Test fixture for fuse-lin
38、ks with I RW 35 A BS ISO 8820-7:200714 Bibliography 1 ISO 8820-2, Road vehicles Fuse-links Part 2: Users guide BS ISO 8820-7:2007 blankBS ISO 8820-7:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British
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