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.
If you look, you will also find a series of letters on a wire. These labels are also standard and will tell you more information about the makeup of the wire. For instance, the code may tell you whether it's aluminum or copper or whether or not it is heat resistant. As you learn more about wiring, you'll realize just how often you need to know these things.
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