Look at figure 5-28. As you can see, most of these cables are run through holes in the framing members. When holes are involved, you must plan ahead for easiest installation and the least waste. You would find it to be a little easier to run the cable between the two duplex receptacle boxes in the figure if you put a carton of cable near the box on the right and thread it through the holes to the box on the left. For the circuits that run from the left duplex receptacle box and the switch box to the ceiling outlet, the carton of cable should be placed under the boxes. Then you thread the cable up through the holes to the ceiling outlet. From these examples, you can see that you need to look at what is involved before you start to run the cable for a circuit. After you have completed the roughing-in phase of a project, your job comes to a halt for a time. In most cases, you should not start the finish work until the walls and ceilings are completed; after which you can splice wires as needed and install the receptacles, outlets, switches, lighting fixtures, and covers.
Once you begin the finish work, the first thing you need to do is to make all ground connections. Equipment grounding is the grounding of all exposed noncurrent-carrying metal parts of an electrical system to the earth. Grounding is done to protect anyone who might come in contact with these parts from being shocked and also to protect equipment from damage. Grounding is accomplished when all noncurrent- carrying parts are connected to a grounding conductor (or grounding has been achieved by other means, as approved by the NEC), and the grounding conductor has been connected to earth at the service equipment or panelboard, as shown in figure 5-29. The equipment
Figure 5-28. - Nonmetallic cable installation.Continue Reading