The article presents the results of a metallographic study of copper conductor reflow zones obtained as a result of imitation of current overloads when laying directly on the wall surface and in PVC cable ducts of different sizes. It was found that when the conductors are laid directly on the wall surface in the reflow zones, structures are formed, including copper grains with a dendritic structure. When laying conductors in cable channels in the melting zone, equiaxed copper grains and a significant number of macropores are predominantly formed. The change in the structure of the metal in the zone of reflow of the conductor when laying in cable channels is associated with a change in the conditions of heat and gas exchange
fire investigation, fire and technical expertise, electrical wires, current overload, metallographic analysis
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