What is the purpose of a conduit expansion joint?

The purpose of a conduit expansion joint is to accommodate thermal expansion and contraction that occurs due to temperature changes in the environment. As temperatures fluctuate, the materials that make up the conduit can expand when heated and contract when cooled. This movement can create stress and potential damage to the conduit system if not properly managed. An expansion joint is specifically designed to absorb this movement, allowing the conduit to lengthen or shorten without causing stress on the joints or connections. This ensures the integrity and longevity of the conduit system, preventing leaks or failures that could arise from thermal stress.

The other options, while relevant to conduit systems, do not accurately represent the primary function of an expansion joint. Connecting sections, reinforcing structures, or improving aesthetics do not address the issue of accommodating movement due to temperature changes, which is the critical role of an expansion joint in conduit installations.