A-A-50563 Conduit Outlet Boxes, Bodies, and Entrance Caps, Electrical: Cast MetalThis commercial item description CID establishes the government acquisition requirements for cast metal conduit outlet boxes, bodies, and entrance caps for use with threaded and threadless rigid conduit, intermediate metallic conduit, and electrical metallic conduit. Outlet boxes may be used as wire outlets or as mountings for lamp holders, rosettes, switches, convenience outlets, to enclose wire splices, for mounting or enclosing surface wiring offsets, pull boxes, and other functions in conduit runs. Entrance caps provide a weather resistant service entrance for wires.

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A-A-50563B

3.5 Construction. The construction of conduit outlet boxes, bodies, and entrance caps shall insure sufficient strength and rigidity in the finished product to enable the product to resist damage during shipment, rough handling, installation, and use.

3.5.1 Type I. Type I conduit bodies shall essentially be an enlarged section of conduit. Covers for conduit bodies of the same size supplied under the same contract shall be interchangeable.

3.5.2 Type II. Type II outlet boxes shall have two tapped No. 6, 32-threads-per-inch (32-threads- per-2.54 cm) device attaching screw holes located on 3 9/32-inch (8.3-cm) centers for each wiring device position. Covers for the same form supplied under the same contract shall be interchangeable.

3.5.3 Type III. Type III outlet boxes shall be cylindrical in shape and shall be designed to permit installation of standard 4-inch (10.2-cm) round outlet box covers with or without wiring devices. The outlet box surface mating with the cover shall be flat and smooth. Outlet boxes shall be designed for surface mounted installation.

3.5.4 Type IV. Type IV outlet boxes shall be cylindrical in shape and shall have surface mating with cover smooth, flat, and designed for the reception of a gasket. Holes for attaching a cover shall not communicate with the interior of the outlet box. Means shall be provided for attaching wiring devices or a fastening strap on which wiring devices can be mounted. When specified, outlet boxes shall be provided with mounting feet .

3.5.5 Type V. Type V outlet boxes shall be cylindrical in shape and designed for wiring in hazardous locations. Outlet boxes of design 20 through 23 shall be threaded for attachment of the cover, and the cover shall be provided with lugs or comparable devices to facilitate installation. When specified, the base of design 20, 21, 22, 25, and 26 outlet boxes shall be furnished with at least two lugs to permit screw or nail mounting. The base of the design 23 outlet box shall be extended to provide a mounting flange with four holes at quadrant intervals. Design 25 and 26 outlet boxes shall have the cover attached by not less than four screws spaced equidistant around the perimeter.

3.5.6 Type VI. Entrance caps shall essentially be a conduit terminating fitting at the point of service entrance connection. The entrance cap shall assure a rain-tight condition within the conduit when the service entrance wires are installed with the proper drip loop. Entrance caps shall be provided with insulating covers containing knockouts of sufficient size to accommodate the wire sizes applicable to the particular conduit size.

3.6 Threaded conduit hubs. Internal conduit threads shall be in accordance with FED-STD-H28/8, "Screw-Thread Standards for Federal Services Section 8 Dryseal Pipe Threads", for tapered pipe thread form, except for hubs on service entrance caps that may be straight thread form. The hubs of the outlet boxes and bodies shall be threaded in such a manner that the centerline of the conduit, when attached, shall be in alignment with the centerline of the hub.