BS ISO 8820-13:2020 pdf free.Road vehicles——Fuse-links.
In addition to carrying out the test procedures in accordance with ISO 8820-1, the following criteria apply. Tests shall be performed following the test sequences in Table 2. The test fixtures for electrical tests shall be designed in accordance with Figure 1. Only one element at a time is energized. The connection resistance shall be≤0,8 mΩ for Type P fuse-links to ensure the proper function of the test fixture. Each electrical test shall be repeated after a fuse-link is repositioned in the fixture shown in Figure 1.Fuse-links according to this document shall provide for visible evidence of an open fuse-element.See Figure 2 and ISO 8820-1. At an elapsed time of 0,025 s on-time, the current shall fall to a value between 1,65 IR and 2,5 IR. At no time during the first 4,5 s of each cycle shall the steady-state current fall below 0,9 IR.A force (F1 … F3) shall be applied to each of the tabs of the fuse-link in accordance with Figure 3. The force shall be held for 2 s. The test force shall not be applied abruptly. The deformation of the test sample shall not exceed 0,5 mm. After the test, the insulator shall be intact and the terminals shall not be removed from the insulator. Test cable sizes shall be as given in Table 6. All tests for a particular fuse-link rating shall be performed using the same cable size. Test cable sizes are specified to allow comparative fuse-ink tests to be carried out. The cable size specified herein does not necessarily indicate the size of cable to be used in the vehicle application. For application tests where both fuse elements are energized at the same time, see cable sizes in Annex B.The test may be carried out using fuse-links, fuse holders and connections as specified by the vehicle manufacturer. Test cable sizes shall be in accordance with Table 6. The test shall be performed in an oven with a test current of 0,5 IR at an ambient temperature of 85 °C. The temperature shall be measured at the point the fuse-link terminals protrude from the base of the insulator using thermocouples as specified by the vehicle manufacturer (see Figure A.1).BS ISO 8820-13 pdf download.