To prevent electrolytic corrosion in a corrosion high-risk area, how must the building ground be treated?

To prevent electrolytic corrosion in areas considered high-risk, the appropriate approach is to separate the building ground from the Outside Plant (OSP) ground. The primary reason for this separation is that joining these two grounding systems can create a galvanic cell, which accelerates the corrosion process. When different metals are in contact in the presence of moisture, a potential difference can occur, leading to the electrolysis of metals, particularly in grounded structures and conduits that may become wetted over time.

Isolating the building ground protects against unintended current paths and reduces the risk of corrosion potentially damaging underground facilities and structures. Each grounding system should function independently to maintain safety and ensure the effective performance of electrical and telecommunications systems.