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Naturally, bending the conductor allows us to have a slight reduction in the required space, and it is easier to make a 90 degree bend into a terminal point.
Junction box volume with plaster ring code#
This is the portion of the code that gives us the required bending space for conductors, which depends on both the size of the conductor and where it enters the enclosure in relation to the termination position. One of the most important items (in my opinion) is the Deflection of Conductors requirement in 312.6. These are some of the most basic items to look for, but please review your codebook to fill in the other items I have skipped. If you have a combustible finish wall, you must have cabinets flush or projecting past the surface. Positioning within walls is covered next, and you are allowed a ¼″ setback if in concrete, tile or other non-combustible materials. Some basic items here are related to prevention of moisture accumulation within the enclosures and the need for a ¼″ airspace between the enclosure and the mounting surface. The conductors that enter from the top and terminate in the highest lugs would be considered as entering the opposite wall as in 312.6(B)(2) all the others would have to meet the requirements of 312.6(B)(1).Īrticle 312 begins with installation requirements for damp and wet locations. This is a good example of the wire bending space requirements found in Article 312. A few times, I have seen out of area contractors come into town and complete installations which are the way they have done them in other locations, only to be surprised during inspection to find out they needed to change out equipment to meet local utility requirements. If you have a question on an installation dealing with one of these items, contact your local utility and ask for their regulations or approved design documents to see what they require.
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For the jobs inspected by combination inspectors, most of these items will be regulated by the serving utility and are, therefore, out of the inspector’s jurisdiction. We will not spend a great deal of time on Article 312 since this article is typically applied to current transformer (CT) cabinets, utility cutout boxes and meter bases. Article 314 deals with Outlet, Device, Pull, and Junction Boxes Conduit Bodies Fittings and Handhole Enclosures. Article 312 deals with Cabinets, Cutout Boxes and Meter Socket Enclosures. These two articles deal with similar subjects, so they have some conceptual overlaps. Our focus for this article will be 2011 NEC Articles 312 and 314.