EXAMINATION OF COUNTERFEIT CONDUCTORS WITH SIGNS OF A SHORT CIRCUIT

The article reviews an expert study of conductors with melting due to a short circuit from the places fires. Given urgency problem low-quality on sale, issue studying such objects is considered. use counterfeit cable and wire products leads fires, resulting in both material losses deaths, while number fires caused by increasing. For most used copper wires, electrical properties are determined presence impurities, some which have significant effect resistance. technical standards for round rolling (rolled wire) regulate 19 types content limited thousandths percentage only. Thus, oxygen 0.04 %. In impurities can be only limit solubility liquid metal. particular, reach limits when there will eutectic 0.39 this case not electrical, but also mechanical external change, practically manifested as decrease plasticity defects conductor surface. development methods has been going more than decade, nowadays all issues methodological support resolved. indicators phase does additional research necessary. possibility that could present among study, it proposed results metallographic studies cases undoubted high-quality conductors. express assessment quality, recommended tests twisting-untwisting (assessment properties) surface evaluation under insulation samples areas damaged fire. parameters condition rejection signs, twisting-unwinding cycles set manufacturer depending diameter wire. Key words: signs circuit, conductors, researches fire places.