8/10/2023 0 Comments Plaster rings and domed coveres![]() ![]() ![]() 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.Contrary to popular electrical opinion, designated rules limit the number of conductors allowed within outlet, device, and junction boxes.Outlet, Device, Pull, and Junction Boxes Conduit Bodies Fittings and Handhole Enclosures Unfortunately, all too often, electricians remove junction box covers only to find the box crammed full of conductors. ![]() Some creative methods have been devised to overpack the conductors into a junction box so that the cover can still be installed. Such methods include, but are not limited to: carefully wrapping the conductors around the inside of the box so that no air space remains mashing the conductors down with the thumb, the heel of the hand or even by applying force with the handle of a hammer. An optional creative method is to back out the junction box screws, insert a blank plate, then tighten the screws, thereby compressing the conductors. Of course, not one of these methods is correct. Article 370 contains detailed requirements for box fill and junction box sizing.Īrticle 370 of the National Electrical Code (NEC) covers a variety of provisions pertaining to boxes (outlet, device, pull junction), conduit bodies, and fittings. It covers the installation and use of all boxes (and conduit bodies) used as outlet, junction, or pull boxes, depending on their use. It also covers manholes (including other electric enclosures intended for personnel entry). Manholes and Other Electric Enclosures Intended for Personnel Entry (new to the 1999 edition), and E. Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal. This month's In Focus discusses Installation (Part B).ģ70-15 Damp, Wet, or Hazardous (Classified) Locationsīoxes, conduit bodies, and fittings in damp or wet locations must be placed or equipped so as to prevent the entrance of, or internal accumulation of, moisture. Damp locations, as defined in Article 100, are locations subject to moderate degrees of moisture. Partially protected external locations under canopies, marquees, roofed (open) porches, and similar sites are considered damp locations as are some interior locations such as certain basements, barns, and cold-storage warehouses.
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