Assessment of Functionality of Aged Cables at Loading by Heat Flux

Polymers belong to most spread organic flammable materials. They are decisive material – insulator also in cable production. Regarding the safety of buildings it is necessary to know their fire-technical characteristics, which predict their behaviour in case of fire. The article deals with testing cables protected and non-protected with intumescent coating, exposed to heat flux, in dependence on distance. A special equipment was developed for testing the inflammability, allowing objectivisation of critical conditions leading to ignition of tested materials.