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Electric Cable Tray Warning Sign

Fibre interconnection and data room reference Published 08 Jan 2026

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Cable trays carrying conductors over 600 volts must display a permanent, legible “DANGER — HIGH VOLTAGE — KEEP AWAY” warning at intervals not exceeding 10 feet, following NEC and ANSI standards.

Regulatory Requirements

According to the National Electrical Code (NEC) 392. 18(H), any cable tray containing conductors rated over 600 volts must have a permanent, legible warning notice stating “DANGER — HIGH VOLTAGE — KEEP AWAY” in a readily visible position on all cable trays, with spacing not exceeding 3 meters (10 feet). These labels must comply with NEC 110.

21(B), which requires hazard markings to effectively warn of danger using appropriate words, colors, and symbols. Handwritten labels are not permitted except for variable information.

ANS

I Z535. 4-2011 provides guidance on font type, size, color, capitalization, and symbol usage for safety labels.

Design and Materials

Warning signs for cable trays are available in aluminum, plastic, or laminated labels that are UV, chemical, abrasion, and moisture resistant, suitable for indoor and outdoor environments. Signs often include bold text and graphic symbols to clearly communicate the hazard to employees and visitors. Some signs come with self-adhesive backing for easy installation, while others have mounting holes for secure attachment.

Colors typically follow safety conventions, with yellow or red backgrounds and contrasting black or white text for high visibility.

Placement and Visibility

Signs should be mounted at intervals not exceeding 10 feet along the cable tray. They must be readily visible to anyone approaching the tray. In industrial settings where equipment is inaccessible to unqualified personnel, signs may be placed where necessary to ensure safe maintenance and operation.

Additional Considerations

Electrical identification labels can also be used to mark specific circuits, pathways, or hazards within cable trays, improving safety and compliance. Overhead cable trays may require overhead obstruction warning signs to alert personnel to potential head hazards in addition to electrical danger. Labels should be durable and resistant to environmental factors to maintain legibility over time, especially in outdoor or industrial environments.

By following these guidelines, organizations can ensure compliance with NEC standards, enhance workplace safety, and reduce the risk of electrical accidents.

Electric Cable Tray Warning Sign - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Electric Cable Tray Warning Sign
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This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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