What does the term “conduit expansion fitting” refer to?

The term "conduit expansion fitting" specifically refers to a fitting designed to accommodate the thermal expansion and contraction of electrical conduit systems. As temperatures in the environment change, the materials making up the conduit can expand or contract. Without the ability to allow for this movement, stress can build up in the conduit, potentially leading to damage or failure in the system. By incorporating an expansion fitting, the conduit can safely expand and contract without compromising the integrity of the wiring or the enclosure they protect.

In the context of the other options, while an increase in conduit diameter, connections at right angles, and aesthetic purposes are all valid types of conduit fittings, they do not address the critical function of managing temperature-induced movement. Therefore, recognizing the specific role of an expansion fitting is essential for maintaining proper electrical system performance and longevity.