One of the key to proper electrical wiring installation is the use of correct letters and colors of electrical wires. These specifications of electrical wires need to be followed accurately in order for the electrical appliance, unit or system to function safely and efficiently.
The different colors of electrical cables will tell the purpose of the wires. Those in black are at all times utilized as hot wires. They are frequently used for switch legs and may be fed to an outlet or switch. These wiring must never be used in ground or neutral connections.
Red wires are used like black ones. They are utilized as hot wires or switch legs such as that in ceiling fans. Electrical installations of circuits that run on 220 volt power, reds serve as second hot-wires. Wires in red color are also applied as the wire that interconnects hardwired detectors for smoke.
Other colors are used because the heat cable is yellow and blue. They often lift in channels. Switch with 3 or 4 applications that are generally installed for travelers used with blue cables. Fans and switch lights also have foot switch with blue cables. In general, yellow cables are used as foot switches to control units such as fans, light and other outlets that require switches.