a. Electrical conductors/wires are connected to a box with connectors. Connectors come in different sizes and shapes and are used to secure all types of cable or conduit to the box (Figures 13, 14, and 15).

b. Always use the appropriate connector for the type of cable or conduit being used. The design of the box also dictates the type of connector to be used. When using a round ceiling pan (round electrical box), never use conduit or connectors that require a locknut or bushing on the round surface of the box (Figure 16).

c. Use connectors on the flat back part of the box, not on the round sides of the box. Conduit and connectors are not used on the round surface because there would not be a good, tight connection between the bushing and the box or between the locknut and the box (Figure 17).

d. Never leave knockout holes open in an electrical box; seal them with a knockout plug (Figure 18). The item marked A is pushed into the hole. The item marked B is installed by placing it half inside the box and half outside the box and then securing the two pieces together with a screw through the middle of the fixture.

e. Box-hanging straps are mounted to building studs to support electrical boxes that accommodate lighting devices (Figure 19). If the box is too deep, you may have to use a fixture extension.