Final answer:
To protect against electrical shock and thermal hazards, a wire should be part of a three-wire system with proper grounding and the use of a GFCI.
Step-by-step explanation:
If a wire in an electrical appliance is installed in such a way that it comes into contact with moving parts, it is critical to ensure the wire is properly protected. To prevent electrical shock hazards and thermal hazards, it is essential to employ electrical safety devices and systems. One such system is the three-wire system, which includes a live/hot wire, a neutral wire, and an earth/ground wire. The appliance casing and neutral wire should be grounded properly. Additionally, a ground fault circuit interrupter (GFCI), or a ground fault interrupter (GFI), is crucial in detecting any loss of current to an unintended path and preventing shock.
In the event of worn insulation or direct contact between the live wire and the appliance casing, the lack of a proper ground can lead to a severe electrical shock. To ensure safety, the wire should be insulated, and if any damage to the insulation occurs, it should be repaired immediately. With a proper grounding system in place, circuits breakers or fuses will trip in case of a ground fault, interrupting the current and hence forcing repairs to prevent accidents.
Finally, colors for insulating material may vary by region, so it's essential to familiarize yourself with the local color codes for wiring to ensure proper installation and safety.