Dome Mechanical Seal Fiber Optic Splice Closure (FOSC)SNR-F

- Dec 17, 2018-

1.  The process of installing FOSC.

1.1   Step One - Open the closure

1.1.1      Cleaning the locale and determine where to install the FOSC and then place

           fiber cables required.

1.1.2      Check whether the main components and accessories have been well prepared

           inside the package.

1.1.3      Open the closure

      Demount hoop fixing bolt and pull hoop locking system out, then proceed in

    demounting the hoop.

    Pull the FOSC cover upwards out, installation could begin.   

1.1.4       See Drawing 1

                Important issues: If the weather condition is not good enough, then a tent must

                                           be pitched for waterproof and dustproof.


1.2 Step Two -Determine length of fiber cable to be fixed and stripped inside


1.2.1 . Fiber cable in 120mm length: the distance from small gasket ring to fiber cable


. Fiber cable in 1740mm length: it is used to be winded and spliced after stripping.

. Fiber with protective coat in 140mm length: the distance from the fixing point of

 fiber cable to the fixing point of FOST (fiber optic splice tray).

 . Fiber in 1600mm length: after stripping off the protective coat, it is to be winded inside the FOST after splicing with other fibers

1.2.2   See Drawing 2

Important issues:  1. Reserve enough length of fiber cable to be spliced.

                           2. Stripping length also could be decided by customers according to

installation requirement


1.3  Step Three –Strip off protective coat of fiber cable and fiber

  1.3.1  Strip off protective coat of fiber cable from the temp. locating mark with the cutter and

              the stripper, please refer to Drawing 2 for stripping length. Stripping length also could

              be decided according to installation requirement

1.3.2  See Drawing 3.

Important issues:  If it is difficult to pull all the protective coat of fiber cable at one time, strip

 it off section by section to avoid fiber breakage.

未标题-3.jpg  Step Four – Separate fiber cores and prepare work prior to fixing fiber cable.

1.4.1     Wind 2 layers of insulation tape on protective coat of fiber core for protection.

          Meanwhile, get rid of the stuffing to separate fiber core and clean them. Form a ring

  with the diameter of 100mm or so and fix it on the fiber cable temporarily by adhesive tape. 

1.4.2     Reserve reinforced core in 50mm length and cut off the unnecessary ones.

1.4.3     See Drawing 4.

            Important issuesEntry/exit tubes are to be selected accurately to make it easy for splicing and sealing. 


1.5  Fix reinforced core, and pyrocondense, fix and seal fiber cable.

1.5.1  This FOSC is provided with 6 entry/exit tubes, among these tubes, 2 entry/exit tubes suit for fiber cable with max. diameter ф 21mm, 4 entry/exit tubes suit for fiber cables with max. diameter ф 16mm.

1.5.2          After deciding number of fiber cable entry/exit, demount the nut, gasket and gasket

                   ring of the corresponding entry/exit tubes according to the diameters of fiber cables

                      actually to be installed, insert them into fiber cable in sequence, then insert fiber cables

                      into entry/exit cable , tighten the nut in order to seal properly.

     1.5.3  Do not demount the nut of entry/exit tubes which fiber cables are not installed.

1.5.4  While diameter is not big enough, enlarge the diameter with seal tape at fixing position of

 small gasket ring in order to improve sealing.

  1.5.5  Fix fiber cable to the fixing seat, press it with the pressboard. While diameter is small,

          enlarge the diameter with insulation tape at the fixing position of fixing seat.

1.5.6  Demount the nut of fixing device of reinforced core with special wrench (plastic one),

set reinforced core into fixing slot, tighten the nut, retighten it with metal wrench (metal

wrench to be provided by operator).

         1.5.7  See Drawing 5

Important issue: Fixing nut of reinforced core should be tightened.


1.6  Step Six - Splice fibers

         1.6.1  Follow user manual of fusion splicing machine to splice fiber.

         Important issue: pay attention to the twist and bend of fiber


1.7   Step Seven -Install heat shrinkable protective sleeve and house fibers.

         1.7.1  When having completed splicing the fibers, the first fiber ring should be housed

                   on the farthest side of FOST, the remaining fiber should be winded, forming a ring

                   with diameter not less than 80mm. then put it into FOST (Fiber Optic Splice Tray)

 together with heat shrinkable protective sleeve.

( Firstly fix heat shrinkable protective sleeve into the slot, then enlarge the diameter of

fiber ring properly.)

     1.7.2  See Drawing 6

Important issue: pay attention to the twist and bend of fiber.


1.8       Step Eight - Check up comprehensively

To ensure the technical requirements, the following instructions must be followed:

1.8.1       Fibers with protective coat are fixed with nylon tie at the entrance of FOST.

1.8.2       Grommet should be pressed from inside to outside in order to properly install FOST.

1.8.3       If there are fibers with protective coat reserved, wind it into the fiber holding tray.

1.8.4       Check whether the internal tighteners and reinforced core are well tightened.

1.8.5       Check whether gasket ring is installed neatly and smoothly without any breakage. If not, level it up with seal tape.

1.8.6       See Drawing 7.

Important issues: If any problems occur, they should be solved right away.




1.9  Step Nine – Assemble FOSC housing and fix FOSC

1.9.1    Put desiccant into FOSC

         1.9.2    Put FOSC cover on base directly.

         1.9.3    Install plastic hoop between FOSC cover and the base, tighten hoop locking system,

   which is to be fixed by hoop fixing bolt then.

     1.9.4    All nuts (plastic ones) of base need to be retightened once more.

1.9.5    FOSC installation

                        Aerial application: fix metal hoop and transom to the pole. Please refer to Drawing 8

Wall mounting application: fix the bracket on the wall with the  bolt. (metal hoop is

not required.)

                     Underground application: metal hoop is not required.

1.9.6  See drawing 8

Important issues: 1. Pay attention while installing plastic hoop.

                             2. The specification of the bolt for wall-mounting is M8.


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