ANALYSIS OF THE POSSIBILITY OF IGNITION OF VARIOUS MATERIALS BY SHORTCIRCUIT SPARKS

Abstract

The paper studies the possibility of various substances ignition with an electric ignition source, namely, a short circuit, depending on different parameters. The comparative analysis of fires causes depending on the approach of their conditional classification is given. Among others, ignition sources of electrical origin are highlighted. An analysis of the fires causes statistical data collection used by various countries is carried out. It has been established that when using different approaches to their collection, the number of electrical ignition sources varies from 15 to 27%. And up to 50% of them are short circuits. The main characteristics of a short circuit and its fire hazard are considered. It has been established that in the event of a short circuit an intense scattering of sparks (drops of molten metal) is observed. The paper considers the methods for calculating the flight times of a various metals spark in various aggregation states and the possibility of igniting combustible materials by them. Found that a drop of molten copper will be a ignition source for textiles, rubber and fabric with dimensions larger than 2.9 mm; a drop of molten steel will be the ignition source for solid combustible materials with dimensions larger than 2.6 mm.