Interbuilding communications circuits may be considered to have a lightning exposure unless there are how many or fewer thunderstorm days per year?

Interbuilding communications circuits are particularly susceptible to lightning exposure, which can lead to significant damage if not properly protected. The determination of the threshold for lightning exposure is based on the frequency of thunderstorms in a region.

In areas where there are five or fewer thunderstorm days per year, the likelihood of experiencing lightning strikes that could impact the interbuilding communications circuits is considerably low. This threshold provides a guideline indicating that in such climates, the risk of lightning damage is manageable, allowing for more flexibility in how these circuits are installed and protected. When the number of thunderstorm days exceeds this number, it raises the probability of lightning strikes and necessitates enhanced protection measures for these circuits.

This approach is rooted in evaluating the environmental conditions surrounding the installation and the potential for lightning strikes based on historical weather patterns. Recognizing the balance between natural occurrences and circuit design helps ensure proper safety and functionality in various installation scenarios.