Why should optical cables be protected against lightning
Optical cable lines lightning protection and strong current protection are achieved by avoiding, guiding or discharging them underground to prevent lightning and strong current from causing damage to the optical cable lines themselves, communication equipment and personnel. Although the signals in fiber cables are optical signals, most of the outdoor optical cables using reinforced cores or armored optical cables are easy to get damaged under lightning because of the metal protective layer inside the cable. As we all know, optical fiber is non-conductive and can be protected from inrush current. This is because OPGW cables are usually installed above high-voltage transmission lines.
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