Why is it recommended to use more than one anode for cathodic protection of a piping system?

Using more than one anode for cathodic protection of a piping system is crucial because it enhances the reliability and effectiveness of the protection system. In the event of accidental damage to the lead wire associated with a single anode, having multiple anodes ensures that the protective measures remain intact. This redundancy minimizes the risk of corrosion on the piping system, which could occur if the single anode fails or becomes disconnected.

While the other options present potential considerations in different contexts, they do not directly address the primary reason for employing multiple anodes. Matching the load of the system or reducing installation costs may influence design decisions, but they do not inherently provide the same level of protection against failure as using multiple anodes does. Aesthetic uniformity might be desirable in some projects, but it is not a relevant factor in the context of ensuring effective cathodic protection for underground systems, where functionality is the key focus. Overall, utilizing multiple anodes creates a more resilient and dependable protective environment for the piping system.