Matters needing attention in fiber optic wiring

In our actual wiring application process, we often encounter some problems, especially in the process of optical fiber wiring, some details are not handled properly, resulting in unsatisfactory test data, failure to pass acceptance and other problems and headaches. Today we are here. Briefly talk about some issues we need to pay attention to in fiber optic wiring:

1. Clean and try

Before laying the optical cable, the pipe holes should be cleaned and tested one by one. When cleaning, use a special cleaning tool, and use a test stick for test pass inspection after cleaning. The inner diameter of the plastic sub-tube should be 1.5 times the outer diameter of the optical cable. When more than two sub-pipes are placed in a cement pipe hole, the equivalent total outer diameter of the sub-pipes should be less than 85% of the inner diameter of the pipe hole.

2. Lay out the plastic sub-pipe

When wearing more than two plastic sub-pipes, if the pipes are of different colors, the ends may not be marked. If the pipes are the same color or no color, the ends should be marked separately. The length of the plastic sub-pipe should not exceed 300m, and it is required that the plastic sub-pipe shall not have a joint in the middle of the pipeline.

In addition, when the plastic sub-pipes are laid out, the ambient temperature should be between -5 degrees Celsius and +35 degrees Celsius to ensure that their quality is not affected. The finished plastic sub-pipe should be fixed with the cement pipe in time to prevent the sub-pipe from sliding. In addition, the sub-pipe orifice should be temporarily blocked to prevent foreign matter from entering the pipe. The plastic sub-pipe shall have sufficient length in the entry hole according to the design requirements.

3. Optical cable pulling

The length of one-time traction of the optical cable should generally be less than 1000m. When this distance is exceeded, segmental traction should be adopted or an auxiliary traction method should be added in the middle position to reduce the tension of the optical cable and improve the construction efficiency. In order to protect the outside of the optical cable from damage during the pulling process, when the optical cable penetrates the pipe hole, the pipe bend or crosses with other obstacles, protective measures such as guiding device or bell mouth protection tube should be adopted. In addition, materials such as neutral lubricants can also be applied to the outside of the optical cable as required to reduce the frictional resistance when the optical cable is pulled.

4. Reserve margin

After the optical cable is laid, the optical cable should be placed on the specified pallet one by one in the entry hole or hand hole, and an appropriate margin should be left to prevent the optical cable from being too tight. When the optical cable in the entry hole or hand hole needs to be connected, the reserved length should meet the minimum value of the relevant regulations.

5. Joint handling

The optical cable shall not have a joint in the pipe hole in the middle of the pipe. When the optical cable does not have a connector in the manhole, the optical cable is required to be bent and placed on the optical cable support plate for fixing and binding, and must not pass directly in the middle of the manhole, otherwise it will not only affect the construction and maintenance, but also easily lead to damage to the optical cable. When the optical cable has joints, it should be protected by pipes such as snake-shaped hoses or soft plastic pipes, and placed on the pallet to be fixed and bound.

6. Blocking and marking

The outlet end of the pipe hole through which the optical cable is placed should be tightly sealed to prevent moisture or debris from entering the pipe. Optical cables and their splices should have identification marks, and indicate the serial number, type and specification of the optical cable. In severe cold areas, anti-freezing measures should also be taken to prevent the optical cable from being damaged by freezing. If the optical cable may be damaged, insulating plates can be installed on or around it for partition protection.