What is the purpose of filling splices with a protective material?

Filling splices with a protective material primarily serves to prevent oxidation. When conductors are spliced together, they can be exposed to environmental factors such as moisture, air, and contaminants that can lead to oxidation or corrosion. These chemical reactions degrade the quality of the electrical connection over time, potentially resulting in increased resistance, electrical failures, or complete loss of conductivity.

By applying a protective material to the splice, it effectively seals the connection from these elements, significantly extending the life and reliability of the electrical system. The protective material acts as a barrier that minimizes exposure to moisture and air, thus preventing oxidation and ensuring sustained conductivity and performance.

While the other options might describe possible benefits in specific contexts, they do not directly relate to the primary protective aim of preventing oxidation, which is critical in maintaining functional integrity and safety in electrical systems.