Changes of transmission parameters of various types of cables during fire

摘要

This article introduces the issues with application of the LFHC (Low Fire Hazard Cables) and their fire testing. It deals with fire tests of cables according to the valid standards but with additional measurements which show important changes in first minutes of fire. It also shows interesting results measured after fire testing and while cable getting cold. Tests were focused on analysis of the insulating resistance which was recorded at periodical intervals. To complete the information about changes in the structure of the insulating material during fire, results of the TGA (Thermogravimetric analysis) are shown. These results indicate the thermal decomposition temperature of polymers. The aim of this article is to outline the issues of transmission of important information in the first minutes of fire regarding to the devices functioning. The purpose of the article is also to find out if the transmission quality is good enough during fire with regard to the guarantee rescue of the human life.