This article was posted 06/01/2007 and is most likely outdated.

Article 408 Switchboards and Panelboards - 408.7
 

 
Subject - Article 408 Switchboards and Panelboards - 408.7
Based on - NEC - 2005 Edition

June 1, 2007
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Switchboards and Panelboards

408.7 Unused Openings

New section specifies that unused openings for circuit breakers and switches must be closed in a manner approved by the authority having jurisdiction to restrict access to energized parts when the equipment is fully assembled.

Unused openings for circuit breakers and switches must be closed using identified closures, or other means approved by the authority having jurisdiction as providing protection substantially equivalent to the wall of the enclosure. Figure 408-2


Figure 408-2
(Click on image to enlarge)

       
 
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Comments

  • The whole point here is safety. It is not to keep the Qualified Electrician from sticking objects into the openings but, the unqualified, children that can reach the panel cover, and homeowners. It is also a preventative measure to keep objects from accidentailly going through openings and causing shorts, etc. It also contains sparks that may or may not fly out of the panel in a short or fire condition spreading the situation further. It also lessens access to larger size bugs and rodens, which in the attempt can climb through the opening and be electricuted and cause damage and possible fire.

    Scott Williams
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