ISO 8820-1-2014 pdf free.Road vehicles – Fuse-links – Part 1: Definitions and general test requirements.
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 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, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6722, Road vehicles — 60 Vand 600 Vsingle 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 — Pare 5: Chemical loads
IEC 600 68-2-70, Environmental testing — Part 2: Tests — Test Xb: Abrasion of markings and letterings caused by rubbing offingers 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
value of prospective breaking current a fuse-link Is capable of breaking 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.
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 manufacturer’s 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 beginningof 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 recognizable;
— after testing, fuse-link shall be removable in one piece from the test fixture by its intended method.ISO 8820-1 pdf free download.