Final answer:
Unplugging equipment before cleaning is necessary to prevent electrical hazards, including electric shock and thermal risks. Plastic insulation on wires helps to prevent both shock and thermal hazards.
Step-by-step explanation:
Importance of Unplugging Equipment Before Cleaning
It is essential to unplug equipment before cleaning because doing so helps to prevent electrical hazards. When dealing with electronic devices or equipment, the presence of electricity can pose significant risks not only from potential electric shock but also from thermal hazards such as overheating components. Cleaning while the equipment is powered increases the chances of water or cleaning agents coming into contact with live wires, which can lead to short circuits or electric shocks. Furthermore, many pieces of electrical equipment can store energy even if they are turned off, so unplugging ensures all residual power is dissipated before cleaning begins.
Regarding the question of plastic insulation on live/hot wires, it is designed to prevent both shock hazards and thermal hazards. The insulation acts as a barrier, reducing the risk of electric shock by preventing direct contact with the energized wire and also protects wires from environmental factors that could lead to overheating and potentially starting a fire.