Ключевые слова: above, alert, arrow, attention, background, black, cable, caution, current, danger, dangerous, electric, electrical, electricity, energy, fence, hazard, hazardous, high, industrial, industry, metal, power, rail, risk, safety, security, sign, signal, signs, station, steel, substation, symbol, technology, tension, train, transformer, triangle, voltage, warning, white, yellow,