Optical fiber closure is used for protecting the optical fiber fusion splicing head between two different optical cables; a reserved section of optical fiber will be kept in the closure for maintenance purpose.

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• Applications

• In according to environmental conditions, Optical fiber closure is divided into Closure for pole and Closure for tower; in according to the different shell material, it is divided into Plastic Closure and Metal Closure.

   

  1)    Plastic Closure is used for ADSS cable.

  
  2)    Compare with Plastic Closure, Metal Closure has many obvious advantages as mechanical strength, leak tightness and corrosion resistance. It's usually used for OPGW.

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• Characteristics

• Optical fiber closure has some excellent performances, such as good sealing property, waterproof, moisture-resistant, and incorrodible after being installed on the electric power line.

  
  Optical fiber closure is divided into two types: joint-box and Terminal Box, joint-box is used for protecting the connection between two optical fiber cables, while Terminal Box is used for cable terminal or to protect the connection between optical fiber and jumper.

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• Cap-type Joint-Box

• Cap-type Plastic Closure On Pole

   

  

   

  Cap-type Plastic Closure On Tower

   

  

   

  Cap-type Metal Closure On Pole

   

  

   

  Cap-type Metal Closure On Tower

   

  

• Horizontal type Joint-Box

• Horizontal type Joint-Box is mainly used for overhead line, underground, wall cross and pipeline well installation. Apply for direct or multiple connect or diverge of optic fibre cable drop-in. It is mostly used for ordinary optic cable.

   

  

• Terminal Box

• Terminal Box is mainly used for optic fiber cable terminal fixation, fusion between optic fiber cable and pigtail, storage and protection of the reserved optic fiber. Generally, terminal box is including two performance structures, one is full accessories structure, and the other is empty match structure.

   

  

• Joint Closure for OPPC

• During the engineering application of OPPC, the optical fiber unit needs to be separated from the phase conductor; this will come down to optical fiber splicing and Photoelectricity isolation technology. For OPPC application, in order to meet with requirements of fiber splicing, protecting and high-voltage insulation, joint closure is an all-important link.

  
  The joint closure for OPPC is quite different from OPGW and ADSS because it is electriferous during the run-time, it will affect directly to the line safety and normal operation once it is going wrong. According to voltage class, OPPC joint closure needs to adopt the appropriate insulator.

  
  The joint closure of OPPC is divided into joint-box and Terminal Box. Joint closure is installed among towers and poles, plays the role of fibre splicing, protection and power transmission. Terminal Box realized the final optical-power separation.

   

  Suspended type middle extraction connector box

   

  

   

  Suspended type middle through connector box

   

  

   

  Suspended type terminal extraction connector box

   

  

   

  Column type middle extraction connector box

   

  

   

  Column type middle through connector box

   

  

   

  Column type terminal extraction connector box