Final answer:
Yes, a non-metallic outlet box can be used with a metallic wiring system if it has a bonding connection to ground all cable entries. Color-coding enables safe installation and maintenance of electrical systems, which is crucial for identifying wires and ensuring proper connections.
Step-by-step explanation:
A non-metallic outlet box may indeed be used with a metallic wiring system if it is provided with a bonding connection between all cable entry openings. This ensures that the non-metallic outlet box is properly grounded. Electrical safety is paramount when dealing with wiring systems, and that includes using appropriate color-coding for insulation on wires to prevent shock and thermal hazards. Live/hot wires could come in various colors such as brown, red, black, blue, or grey, while neutral wires could be blue, black or white. The earth/ground wire is typically green, yellow, or a bare wire. Such color-coding helps in identifying the wires and ensuring that they are connected properly.
The three-hole outlet and three-prong plug system is designed to ensure the correct alignment and function of the three-wire system. The three-wire system, incorporating live/hot, neutral, and ground wires, is intended to protect both the appliance and the user from electrical hazards. The neutral wire is connected to the earth, hence forced to be at zero volts, providing an alternative return path for current. Moreover, a circuit breaker or fuse is used to protect against thermal overload, and this is in series with the live/hot wire. A Ground Fault Circuit Interrupter (GFCI) is an additional safety device that prevents shock by detecting a loss of current to unintentional paths.