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Electrical Enclosures

What NFPA 79 2007 Says About Safety Signs
for Electrical Enclosures:

16.2 Safety Signs for Electrical Enclosures

Warning Hazardous Voltage Safety Sign
  • 16.2.1 Enclosures that do not clearly show that they contain electrical devices shall be marked with a safety sign in accordance with ANSI Z535 series, which deals with product safety signs.
  • 16.2.2 Safety signs shall be plainly visible on the enclosure door or cover.
  • 16.2.3 It shall be permitted to omit safety signs on the following:
    1. An enclosure equipped with a supply disconnecting device
    2. An operator-machine interface or control station
    3. A single device with its own enclosure (e.g., position sensor)
  • 16.2.4 A safety sign shall be provided adjacent to the disconnecting operating handle(s) where the disconnect(s) that is interlocked with the enclosure door does not de-energize all exposed live parts when the disconnect(s) is in the open (off) position.
  • 16.2.5 Where an attachment plug is used as the disconnecting means, a safety sign shall be attached to the control enclosure door or cover indicating that power shall be disconnected from the equipment before the enclosure is opened.
  • 16.2.6 Where the disconnecting means is remote from the control enclosure, a safety sign shall be attached to the enclosure door or cover indicating that the power shall be disconnected from the from the equipment before the enclosure is opened and that the enclosure shall be closed before the power is restored.
  • 16.2.7 A safety sign shall be provided adjacent to the main supply circuit disconnect operating handle to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment.

    • Electrical Enclosure Signs Catalog

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