How should plumbing systems be constructed to ensure earthquake resistance according to the UPC?

Building plumbing systems to withstand seismic activities is crucial for maintaining the integrity and functionality of these systems during an earthquake. The correct choice emphasizes the importance of including flexible connections and proper anchoring in the construction of plumbing systems. This approach allows for movement and shifts that occur during an earthquake without causing severe damage to the systems.

Flexible connections are designed to absorb and accommodate the movements caused by seismic forces, preventing breakage or disconnection in the pipes. Proper anchoring ensures that the plumbing system remains securely in place, reducing the risk of displacements that could lead to leaks or breaks. This combination of flexibility and stability is vital for ensuring that plumbing systems do not fail during earthquakes, thereby safeguarding public health and safety.

On the other hand, constructing plumbing systems solely from metal materials may not provide the necessary compliance with seismic code requirements, as metals can be rigid and more prone to breakage under certain conditions. Underground installations, while sometimes beneficial for other reasons, do not inherently provide earthquake resistance. Lastly, disconnecting plumbing from the main water supply would severely compromise functionality during and after an earthquake, making it an impractical option. The comprehensive approach of incorporating flexible connections and anchoring is essential for effective earthquake resistance in plumbing systems as outlined by the Uniform Plumbing Code.