Electric wires have a special coating and color to them to identify their uses. Terminals on devices, such as switches and receptacles, have their own color codes so that the correct wires are attached to them. But the number one reason is for safety. By attaching the right colored wires to the right colored terminals, you'll have the correct connection.
...Source: http://electrical.about.com/b/2012/09/21/electric-wire-color-coding-terminals-and-uses.htm
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