Method 4.8.30 is a crack resistance test for glass braid covering on cable insulation. The glass braid covering shall withstand bending, cracking, and puncturing of the overlay covering.
Each specimen consists of a single insulated conductor (including insulation covering) of a length not less than that specified in table XV. Specimens are removed from the completed cable according to sampling rules based on cable conductor count.
The test evaluates the integrity of the glass braid overlay under mechanical stress conditions, ensuring that the protective covering maintains its function of providing additional mechanical and thermal protection to the underlying insulation.