What is one main purpose of determining the maximum percentage of fill in conduit installations?

Determining the maximum percentage of fill in conduit installations is crucial primarily to avoid damage to conductors and insulation. When conductors are installed in a conduit, there is a limit on how many conductors can fit within that space. Exceeding this maximum fill percentage can lead to excessive heat buildup due to poor airflow, which in turn can cause overheating of the conductors. Overheating can damage both the conductors and their insulation, leading to potential failures, short circuits, or even fire hazards. Maintaining the appropriate fill percentage is essential for ensuring the safety and reliability of electrical systems.

The other options, while relevant to electrical installations, do not directly address the primary concern of conduit fill. Proper electrical connections and maintenance access are important, but they do not directly relate to the consequences of exceeding fill limits, as do the risks associated with conductor and insulation damage. Additionally, while maintaining temperature during operation is a consideration in system design, the maximum fill percentage primarily focuses on preventing physical damage rather than temperature regulation itself.