2-3. Ground Conductors. The grounding of boxes is very important. All metal boxes in a circuit must
be grounded. The ground conductor connects all metal boxes and electrical equipment to the panel box.
The panel box is connected to the grounding rod, so that all boxes and electrical equipment are
connected to the grounding rod and the earth ground.
a. When ground conductors are twisted together, they must be secured to prevent them from
coming apart. A wire nut (Figure 2-9) or a splice cap (Figure 2-10) can be used to hold the twisted
ground conductors together.
Figure 2-9. Wire nut holding twisted ground conductors
Figure 2-10. Splice cap holding twisted ground conductors