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NFPA 70 — National Electrical Code (2020)
300.45 Danger Signs.
Danger signs shall be conspicuously posted at points of access to conductors in all raceway systems and cable systems. The sign(s) shall meet the requirements in 110.21(B), shall be readily visible, and shall state the following: "DANGER—HIGH VOLTAGE—KEEP OUT"
665.23 Hazard Labels or Signs.
Labels or signs that read "DANGER—HIGH VOLTAGE—KEEP OUT" shall be attached to the equipment and shall be plainly visible where persons might come in contact with energized parts when doors are open or closed or when panels are removed from compartments containing over 150 volts ac or dc. Hazard signs or labels shall comply with 110.21(B).
NFPA 70 — National Electrical Code (2020)
110.21(B) Field-Applied Hazard Markings.
Where caution, warning, or danger signs or labels are required by this Code, the labels shall meet the following requirements:
- The marking shall warn of the hazards using effective words, colors, symbols, or any combination thereof.
- The label shall be permanently affixed to the equipment or wiring method and shall not be handwritten.
- The label shall be of sufficient durability to withstand the environment involved.
Informational Note: ANSI Z535.4-2011, Product Safety Signs and Labels, provides guidelines for the design and durability of safety signs and labels for application to electrical equipment.
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