What action is essential when dealing with cable sheaths in underground installations?

Maintaining continuity with cable sheaths in underground installations is crucial because the primary function of the sheath is to protect the inner conductors from physical damage and environmental factors, such as moisture and chemical exposure. A continuous sheath ensures that there are no breaks or faults that could lead to moisture ingress, which can cause insulation degradation and potential short circuits.

In addition, a continuous cable sheath supports the overall integrity of the electrical system, helping to prevent outages and maintaining safety. If the sheath is compromised, there could be significant risks associated with the electrical installation, including potential hazards for personnel and equipment.

While labeling, testing for voltage, and color coding are important practices in the installation process, they do not specifically address the protective role of the sheath or ensure its integrity. Maintaining continuity directly impacts the safety and functionality of the electrical system in underground installations, making it an essential action.