Independent Electrical Contractors (IEC) 2A Practice Exam 2025 - Free IEC 2A Practice Questions and Study Guide

In high-temperature environments, silicone is the recommended insulation type for flexible cords due to its exceptional heat-resistant properties. Silicone can withstand a wide range of temperatures without degrading, remaining effective in both extreme heat and cold conditions. This durability makes it ideal for applications where the cord may be exposed to high temperatures, such as in industrial settings or close to heat-generating equipment.

Additionally, silicone is flexible and retains its elasticity even at elevated temperatures, allowing it to bend and move without cracking or breaking. This flexibility is crucial in environments where cords may need to be routed around equipment or in tight spaces.

Other insulation types, such as rubber and PVC, while suitable for many applications, do not provide the same level of performance at high temperatures. Rubber can have limitations in temperature resistance, and PVC can warp or become brittle when exposed to heat. Thermoplastic materials may also not withstand high temperatures effectively, making silicone the superior choice for maintaining both safety and functionality in high-temperature applications.