RESEARCH OF FIRE RESISTANCE OF CABLE PUNCHES WITH THE APPLICATION OF REACTIVE FIRE PROTECTION MATERIAL "ENDOTHERM HT-150"

Abstract

The results of the study of fire resistance of cable penetrations, in the design of which used a reactive fire protection material "Endotherm HT-150". The research methodology based on the provisions of DSTU B B.1.1-8, DSTU-N B EN 1991-1-2, DSTU-N B EN 1992-1-2 has been applied. The essence of this technique is that samples of cable penetrations are installed in a vertical support structure of the furnace. At the stage of fire exposure under the standard temperature regime and at the stage of cooling the furnace, temperature is measured on the unheated surface of the specimens, and their behavior is observed (cracks, holes, flames appear on the unheated side of the specimens). According to the experimental data, the integrity and thermal insulation capacity of cable penetrations are evaluated. According to the results of the research, the characteristics of fire resistance of cable penetrations with the use of reactive fire protection material "Endotherm HT-150" were determined. It is established that the design parameters of these cable penetrations significantly affect their fire resistance. So the cable penetrations, in which the cables are laid in steel boxes with reactive fire protection coating, correspond to the class of fire resistance EI 150. Cable penetration, in which cables with a reactive fire protection coating directly pass through the enclosure structure, corresponds to the class of fire resistance EI 90. Under fire conditions, the temperature on the unheated surface is of the lowest value for the cable penetration, in which the structural steel boxes are used. For a cable duct with a solid steel box, this temperature is several tens of degrees higher. The highest temperature on the unheated surface is provided by the cable penetration, in the construction of which no steel box is used. The direction of further researches which are focused on revealing of influence of parameters of a steel cable box, a protective structure, fire protection lining with application of reactive fire protection material and brands of cables on the fire resistance of cable penetrations is determined.