The ubiquitous presence of a non-metallic sheath around electrical conductors stems from fundamental principles of electrical conductivity and safety. Bare metal, while an excellent conductor, poses significant hazards when exposed, potentially leading to short circuits and electrical shocks. The application of a suitable insulating material mitigates these risks, containing the electrical current within the intended path.
This practice is essential for several reasons. Insulation prevents unintended current flow, safeguarding individuals from electrocution and minimizing the risk of fire. Furthermore, it prevents short circuits that can damage equipment and disrupt power supply. Historically, various materials have been employed for this purpose; however, polymers, especially plastics, have become prevalent due to their cost-effectiveness, flexibility, and suitable dielectric properties. The choice of material balances electrical performance with practicality and economic viability.
