I. Scope and General
314.1 Scope.
This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes, depending on their use, and handhole enclosures. Cast, sheet metal, nonmetallic, and other boxes such as FS, FD, and larger boxes are not classified as conduit bodies. This article also includes installation requirements for fittings used to join raceways and to connect raceways and cables to boxes and conduit bodies.
314.4 Metal Boxes.
Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Article 250 as applicable, except as permitted in 250.112(I).
I'm not sure that this section requires metal boxes be listed ( might make a good proposal for the next cycle)
Approved. Acceptable to the authority having jurisdiction.
This def is pretty clear.
90.4 Enforcement.
This Code is intended to be suitable for mandatory application by governmental bodies that exercise legal jurisdiction over electrical installations, including signaling and communications systems, and for use by insurance inspectors.
The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules, for deciding on the approval of equipment and materials, and for granting the special permission contemplated in a number of the rules.
Some localities do not adopt the NEC, but even in those localities, installations that comply with the current Code are prima facie evidence that the electrical installation is safe.
Section 90.4 advises that all materials and equipment used under the requirements of the Code are subject to the approval of the authority having jurisdiction. The text of 90.7, 110.2, and 110.3, along with the definitions of the terms approved, identified (as applied to equipment), labeled, and listed, is intended to provide a basis for the authority having jurisdiction to make the judgments that fall within that particular area of responsibility.
The phrase ?including signaling and communication systems? emphasizes that, indeed, these systems are also subject to enforcement.
The common sense suggested in this section is mind boggeling
HB exp note to 110.3(B)
In itself, 110.3 does not require listing or labeling of equipment. It does, however, require considerable evaluation of equipment. Section 110.2 requires that equipment be acceptable only if approved. The term approved is defined in Article 100 as acceptable to the authority having jurisdiction (AHJ). Before issuing approval, the authority having jurisdiction may require evidence of compliance with 110.3(A). The most common form of evidence considered acceptable by authorities having jurisdiction is a listing or labeling by a third party.
Some sections in the Code require listed or labeled equipment
Some sections !!
This has been an intersting discussion and I thisnk it amplifies the need for the code to be dynamic so AHJ and installers can achieve a safe installation. (free of shorts etc).
Does any one really believe that the removal of the clamos will burn the structure down?
I would rather they be removed to provide more space because the box is going to be used regardless.