Fiber optic cable transfer box Optical cable junction box is a kind of junction equipment that provides optical cable terminating and jumping for main dry layer optical cable and distribution layer optical cable. After the optical cable is led into the optical cable junction box, after it is fixed, terminated, and fiber distribution, the optical cable of the trunk layer and the optical cable of the distribution layer are connected using a jumper.
Cable transfer box is installed in the outdoor connection equipment, the most fundamental requirement for it is to be able to withstand the drastic climate and harsh working environment. It should have the characteristics of waterproof condensation, waterproof and dust-proof, anti-pest and rodent damage, and strong impact damage resistance. It must be able to withstand the harsh external environment. Therefore, the outer side of the box has high requirements for waterproof, moisture-proof, dustproof, anti-impact damage, anti-pest and rodent damage; The inside of the temperature and humidity control requirements are very high. According to international standards, the highest standard of these projects is IP66. However, there are not many cases that can meet this standard. The cable transfer box box used in China is mainly: the original German KRONE box, the box uses unsaturated polyester glass fiber reinforced material (SMC), which has good performance in waterproof, moisture-proof and anti-impact damage. The imitation of the domestic reference KRONE box is a metal box based on iron (generally up to IP65 standard). For metal boxes, due to their poor performance in waterproof condensation, they are not destined to be used in large quantities and are gradually eliminated. Some domestic imitations due to material performance problems lead to the box in the waterproof condensation and impact resistance of the two performance and the introduction of Germany's KRONE has a big difference, in addition, due to the poor anti-aging performance of the sealing strip, in the waterproof, dustproof performance of the two is also general. Of course, when the external environment of the cable junction box installation location is better, it is acceptable to reduce performance requirements and reduce investment.
① The movable optical fiber connector should meet the requirements of "insertion loss" and "return loss" stipulated in the relevant standards of the selected type.
② The voltage level between the high-voltage protective grounding device and the metal workpiece of the box should not be less than 3000V DC, and there is no breakdown or flare-up in 1min.
③ The insulation resistance between the high-voltage protective grounding device and the metal workpiece of the box is not less than 2´104MW under the condition that the test voltage is 500V DC.
(4) The section of the ground wire connecting the high-voltage protective grounding device with the metal strengthening core, tide retaining layer and armor layer in the cable should not be less than 6mm
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