What is the main function of expansion fittings in raceway systems?

The primary purpose of expansion fittings in raceway systems is to accommodate changes in the length of electrical conductors and raceways caused by temperature fluctuations. As materials heat up, they expand, and when they cool down, they contract. Expansion fittings provide the necessary flexibility and movement in the raceway system to avoid stress on the components, which can lead to damage or misalignment. By effectively compensating for thermal expansion, deflection, and contraction, these fittings help maintain the integrity and safety of the electrical installation over time.

While aesthetic appeal, smooth wiring, and preventing environmental wear are relevant considerations in raceway systems, they do not capture the essential function that expansion fittings are designed to perform. The key role centers around managing physical changes in material dimensions due to temperature variations, thereby ensuring the longevity and reliability of the raceway system.