In an extensive interior metal water supply system, what must be done if a section of plastic is present?

In an extensive interior metal water supply system, the presence of a plastic section poses challenges for the continuity of the grounding system. Plastic does not conduct electricity, meaning that it can create a break in the electrical continuity necessary for effective lightning protection. When a section of plastic is present, it is crucial to bridge that section to ensure that electrical continuity is maintained throughout the entire system.

Bridging is accomplished by installing conductive materials on either side of the plastic to connect the metal components of the water supply system. This is essential because it allows for a continuous path for any electrical surges, such as those from lightning strikes, to safely follow through the system and into the ground. Without this bridging, there's a risk that an electrical fault could lead to dangerous situations, such as equipment damage or even fire hazards.

In summary, bridging the section containing plastic ensures that the lightning protection system is effective and that the safety measures in place are fully operational.