The first stage, which coincides in time with general construction work, includes the installation of fasteners or inserts in structural elements for the subsequent attachment of electrical equipment and structures for the installation of electric wiring. It also includes the installation of conduits for electric wiring in the foundations and floors of buildings or structures and the installation of wall sockets for outlets and switches. In the first stage, the preassembly of electrical equipment and wiring structures, the fabrication of conduit sections, and the board lacing of wires and cables for lighting and other circuits are carried out away from the construction site in specially equipped electrical-installation prefabrication shops.
Feed the cables through the clamps and into the box. The cable sheathing (outer jacket) should extend 1/2 to 1 inch beyond the clamp, and the cable wires should extend about 6 inches into the box. If necessary, trim the wires as needed and strip 3/4 inch of insulation from the each of each wire, using wire strippers. Secure the cables by tightening the screws on the clamps, being careful not to overtighten and damage the cables.
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