Which is an indicator of a properly functioning lightning protection system?

A properly functioning lightning protection system is characterized by minimal follow-current after strikes. This indicates that the system effectively diverts the energy from a lightning strike and minimizes the residual electrical energy that could potentially affect connected equipment or structures. A well-designed system dissipates the lightning energy safely into the ground, which results in little to no significant follow-current being present.

On the other hand, increased voltage readings, frequent equipment failures, and constant maintenance requirements are all signs of a lightning protection system that may not be functioning as intended. Increased voltage can suggest that there is excessive energy being retained within the system or that it is malfunctioning, which could lead to equipment damage. Frequent equipment failures are indicative of inadequate protection, meaning the system is not effectively handling lightning strikes, or that the equipment itself is experiencing stress from the energy. Constant maintenance required usually points to ongoing issues with the system, suggesting that it either is not adequately designed or has components that fail to function properly, thus requiring frequent repairs or adjustments.