Figure 5-24. - Drilling holes for nonmetallic cable.
vertically or horizontally, as shown in figure 5-24. Holes that are drilled in a crooked line or at much of an angle to the line of pull, as shown at the bottom of figure 5-24, make it harder to thread the cable through the holes and pull it into position.
Cable can be placed into notches cut in the edge of the framing members and studs, as shown in figure 5-25, if the notches will not weaken the building structure. The notches should be as small as possible. Their depth must not exceed one fifth of the width of the wood. Cable placed in notches or through studs is protected from nails and screws by a thin metal plate at least one-sixteenth inch thick, according to the NEC, Article 300-4, like those in figure 5-25.
Figure 5-25. - Nonmetallic able installed in notches.Continue Reading