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How to prevent lightning damage in optical fiber and cable wiring
Mar 23, 2018

With the development of the network, as a kind of medium for transmitting data in the integrated wiring system, optical fiber is more and more used by people because it has the advantages of high transmission rate and far distance. As we all know, optical fibers are non-conductive, can be free of shock current, optical fiber cable also has good protection performance, the metal components in the cable to the ground insulation value is high, the lightning flow is not easy to enter the optical cable, but because the optical cable has the strengthening core, especially the direct buried cable has armored layer, so in the optical cable line by lightning


can also occur when the optical cable is burnt or damaged.


Today, here and we explain in detail in the integrated wiring engineering construction of optical fiber optic cable protection of the main measures. Measures one, for the direct cable line of lightning protection: ① on the ground, the metal in the cable in the joints should be connected, so that the relay section of the cable to strengthen the core, moisture-proof layer, armored layer to maintain connectivity. ② in accordance with the provisions of the ydj14-91, in the optical cable joints moisture-proof layer, armored layer and strengthen the core should be used for electrical disconnection, and are not grounded, the ground is insulated, can avoid the accumulation of inductive lightning in optical cables,


It can also avoid the difference between the impedance of the lightning-proof line and the metal component of the cable to the ground circuit, which leads to the Earth's lightning current being introduced into the cable by the grounding device. Measures two, for aerial cable: Aerial puppet should be electrically connected and every 2km grounding, grounding can be directly grounded or through the appropriate surge protection device grounding.


This puppet has the protection function of overhead ground wire. Measures three, the optical cable into the terminal box, the terminal box should be grounded, in the lightning flow into the metal layer of the cable, terminal box grounding can quickly release the Thunder and lightning flow, play a protective role. The use of directly buried optical cable with armored layer and strengthen the core, outer sheath for PE (polyethylene) sheath, can be effective anti-corrosion and mouse bite.


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