![]() ![]() ![]() Other Boxes. Boxes 1650 cm3 (100 in.3) or less, other than those described in Table 314.16(A), and nonmetallic boxes shall be durably and legibly marked by the manufacturer with their volume(s).Standard Boxes. The volumes of standard boxes that are not marked with their volume shall be as given in Table 314.16(A).Each barrier, if not marked with its volume, shall be considered to take up 8.2 cm3 (1∕2 in3) if metal, and 16.4 cm3 (1.0 in3) if nonmetallic. Box Volume Calculations. The volume of a wiring enclo‐ sure (box) shall be the total volume of the assembled sections and, where used, the space provided by plaster rings, domed covers, extension rings, and so forth, that are marked with their volume or are made from boxes the dimensions of which are listed in Table 314.16(A). Where a box is provided with one or more securely installed barriers, the volume shall be appor‐ tioned to each of the resulting spaces.The minimum volume for conduit bodies shall be as calculated in 314.16(C).The provisions of this section shall not apply to terminal housings supplied with motors or generators.Informational Note: For volume requirements of motor or generator terminal housings, see 430.12.Boxes and conduit bodies enclosing conductors 4 AWG or larger shall also comply with the provisions of 314.28. In no case shall the volume of the box, as calcula‐ ted in 314.16(A), be less than the fill calculation as calculatedin 314.16(B). Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies. Boxes and conduit bodies shall be of an approved size to provide free space for all enclosed conductors. ![]() 2: For protection against corrosion, see 300.6. 1: For boxes in floors, see 314.27(B).Informational Note No. For installation of listed drain fittings, larger openings are permitted to be installed in the field in accordance with manufacturer’s instructions.Informational Note No. Approved drainage openings not smaller than 3 mm (1∕8 in.) and not larger than 6 mm (1∕4 in.) in diameter shall be permitted to be installed in the field in boxes or conduit bodies listed for use in damp or wet locations. Boxes, conduit bodies, outlet box hoods, and fittings installed in wet locations shall be listed for use in wet locations. Damp or Wet Locations. In damp or wet locations, boxes, conduit bodies, outlet box hoods, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting.Metal Boxes. Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Arti‐ cle 250 as applicable, except as permitted in 250.112(I).2: Where integral bonding means with a provision for attaching an equipment bonding jumper inside the box are provided between all threaded entries in nonmetallic boxes listed for the purpose, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables. 1: Where internal bonding means are provided between all entries, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.Exception No. Nonmetallic Boxes. Nonmetallic boxes shall be permit‐ ted only with open wiring on insulators, concealed knob-and- tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways.Exception No.Round Boxes. Round boxes shall not be used where conduits or connectors requiring the use of locknuts or bush‐ ings are to be connected to the side of the box.This article also includes installation requirements for fittings used to join raceways and to connect raceways and cables to boxes and conduit bodies. Cast metal, sheet metal, nonmetallic, and other boxes such as FS, FD, and larger boxes are not classified as conduit bodies. 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.Outlet, Device, Pull, and Junction Boxes Conduit Bodies Fittings and Handhole Enclosures ![]()
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