Ключевые слова: background, barrier, blank, boundary, caution, closed, connection, current, danger, dangerous, electric, electrical, electricity, energy, farm, fence, forbidden, hangs, high, home, industrial, industry, power, premises, prevent, prohibited, protect, protection, pulley, residence, safe, safety, secure, security, shock, sign, symbol, technology, threat, voltage, warning, warns, white, wire, wired, yellow,