What is the primary concern when using secondary cables in underground applications?

In underground applications, the primary concern with using secondary cables is moisture resistance. Underground environments are often subject to damp conditions, which can lead to water infiltration. This moisture can damage the cables, leading to electrical faults or failures. Therefore, secondary cables must be properly insulated and designed to withstand exposure to moisture to ensure their functionality and longevity.

While high voltage management, temperature control, and weight limitations can be important considerations in certain contexts, they are not as critical as moisture resistance for underground applications. High voltage management typically pertains to handling and preventing high voltage issues in overhead lines rather than in buried cables, while temperature control might not be as significant in underground installations where external temperatures are generally stable. Weight limitations are important, especially for handling and installation, but they do not directly relate to the integrity and performance of the cable when it is underground compared to the impact of moisture.