Ключевые слова: background, building, cable, cable tray, conductor, construction, control, copper, cross, danger, design, distribution, duct, electrical, electricity, engineering, equipment, factory, ground, group, industrial, industry, installation, insulation, insulation material, ladder, line, metal, modern, pipe, power, rolling, room, section, service, site, steel, structure, substation, supply, support, system, technology, voltage, work,