According to the National Electrical Code (NEC) 392.18(H), any cable tray containing conductors rated over 600 volts must have permanent, legible warning signs stating “DANGER — HIGH VOLTAGE — KEEP AWAY” placed in a readily visible position, with spacing not exceeding 10 feet (3 meters) along the tray . These labels must comply with NEC section 110.21(B), which requires effective use of words, colors, and symbols to clearly communicate hazards. Handwritten labels are not permitted except for variable information, and ANSI Z535.4-2011 provides guidelines for font, color, capitalization, and symbol usage .
Cable trays are used to support, route, and protect electrical wiring, including power, low-voltage control, and data cables . Improper installation or overloading can lead to hazards such as fire, electrical shock, or arc-flash events. Proper labeling helps prevent accidents by alerting personnel to high-voltage areas and ensuring only qualified individuals perform maintenance .
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Cable trays containing conductors operating over 600 volts shall have a permanent, legible warning notice carrying
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Cable trays containing conductors rated over 600 volts shall have a permanent, legible warning notice carrying the wording
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