Ключевые слова: aged, alert, arrow, attention, background, black, board, cable, caution, cracked, danger, dangerous, distribution, electric, electrical, electricity, energy, fence, hazard, hazardous, high, icon, industrial, industry, lightning, line, metal, notice, old, paint, power, protection, risk, safety, security, shock, sign, signal, station, substation, supply, symbol, technology, transformer, triangle, volt, voltage, warning, wire, yellow,