The Fiber Optic Splice Closure is an indispensable and important part of the optical cable communication line. The main function is to realize the connection of the optical fiber of the optical cable. At the same time, in order to ensure the grounding function of the optical cable connection box, the internal grounding device and the grounding part of the optical cable should be in electrical communication, and the metal component of the optical cable connecting box and the grounding device and the optical cable reinforcing core are ensured. They are insulated from each other to avoid adverse effects from the environment on the cable splice closure.

Since the use environment of the cable connection box is basically outdoors, their use environment may be buried, overhead or pipeline. Therefore, high requirements are placed on the design of the fixing and grounding device of the optical cable connection box and the insulating material used.

The length of use of the cable connection box depends directly on the quality of the insulation material. Reasonable and strong insulation material is the fundamental guarantee for high voltage DC breakdown. Therefore, the structure and material of the insulation and the surface condition have a great influence on the withstand voltage strength performance of the cable connection box. In order to improve the withstand voltage performance of the cable connection box, it is necessary to use a better insulating material to increase the surface finish and reduce the curvature between the insulator and the pole and pole and between the pole and the ground. In the case where all other parameters are the same, this case can be increased by at least 100% in length.

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