OPGW Optical Cable Installation Design

The installation design of OPGW optical cables must take into account coordination with conductor stress, sag, and insulation clearance, and ensure that the load does not exceed the permissible limits of the existing towers and foundations. Therefore, the characteristic curve of the selected OPGW optical cable should be calculated based on its primary technical parameters, and the layout diagrams, dimensional drawings, and installation drawings for junction boxes, various hardware fittings, and accessories should be designed in accordance with the actual project conditions.

I. Key Considerations for OPGW Cable Installation

The installation of OPGW cables differs from that of ordinary steel strands. Care must be taken to prevent permanent damage that could impair fiber performance in the future. Particular attention should be paid to: twisting of the OPGW cable, micro-bends, localized radial pressure outside line clamps, and contamination of the optical fibers. Therefore, the following effective measures should be implemented during the construction phase:

1. Preventing Fiber Contamination

During the installation of OPGW cables, care must be taken to properly seal the cable ends.

2. Preventing and Reducing Micro-bends and Stress in OPGW Cables Sharp angles must be avoided (maintain a minimum bending radius of 500 mm); the diameter of the OPGW cable reel should be no less than 1500 mm; The diameter of pulleys should be at least 25 times the diameter of the OPGW cable, generally not less than 500 mm; the inner surface of the pulleys should be lined with nylon or rubber to prevent abrasion of the OPGW cable surface.

3. Preventing OPGW Cable Twist

Install counterweights and anti-twist devices on running boards and tension clamps; use special double-groove pulleys and tensioning machines with dual winches.

II. Design of Vibration Damping Measures

Among the hardware used with OPGW cables, tension clamps are of the pre-stressed type, and suspension clamps are equipped with pre-stressed wires and rubber liners; these two types of hardware already possess a certain degree of vibration damping capability. To further enhance vibration damping, the installation of vibration damping hammers may be considered.