BS ISO 8820-2:2014 pdf free.Road vehicles一Fuse-links Part 2: User guidelines.
This part of ISO 8820 gives guidance for the choice and application of automotive fuse-links which are defined in the other parts of this International Standard. It describes the various parameters which have to be taken into account when selecting fuse-links.
Fuse-links according to ISO 8820 are intended for electrical cable protection. If these types of fuse-links are to be used for electrical component protection, it should be agreed between customer and supplier.
It is intended to be used in conjunction with the other parts of ISO 8820.
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 8820-1, Road vehicles — Fuse-links — Part 1: Definitions and general test requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions in 150 8820-1 apply.
4 Rated voltage and system voltage
The fuse rated voltage shall always be higher than the nominal voltage of the electrical system of the vehicle to allow for possible overvoltage conditions.
5 Rated current and continuous current
The rated current (IR) is the current used for identifying the fuse-link.
The continuous current (‘Ic) in Figure 1 Is the maximum current flowing continuously through the circuit (fuse-link, terminals, holder, and cables) at a maximum ambient temperature. The continuous current is lower than the rated current.
6 Cold resistance
The cold resistance is the resistance of a fuse-link without self-heating at room temperature (RT). It can be calculated by the drop voltage measured, between the measuring points of the fuse-link (specified in the appropriate part of ISO 8820 according to the type of the fuse), at a certain current, typically measured at 10 % of fuse rated current.
The spread of fuse-link cold resistance due to volume production results in a spread in power dissipation and a spread in time-current characteristic (see Figure 2).BS ISO 8820 pdf download.
Tags: Road vehicles
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