Method 4.8.5 is a cable aging and compatibility test performed at 257F (125C) to detect any significant degradation due to component incompatibility or prolonged overheating of completed cable containing thermosetting polyolefin or silicone rubber and glass tape insulation.
The dielectric strength values specified shall be met after the tapes have been conditioned for 24 hours at 73.4F (23C) and 96 percent relative humidity and tested while maintaining temperature and humidity conditions of the short time dielectric breakdown test.
This test evaluates whether the various material components within the cable construction maintain their integrity and do not adversely interact after prolonged thermal exposure, which is critical for long-term shipboard cable reliability.