2. The optical cable in the overhead pole path is required to make U-shaped telescopic bends every 3-5 poles, and approximately 15m is reserved for every 1km.
3. The overhead (wall) optical cables should be protected with galvanized steel pipes, and the pipe openings should be blocked with fireproof mud.
4. Optical cable warning signs should be hung on overhead optical cables every four stops and in special areas such as across roads, rivers, and bridges.
5. The intersection of the hanging wire and the power line should be protected by a three-prong protective tube, and the extension of each end should not be less than 1m.
6. The electric pole cables close to the road should be wrapped with light rods, with a length of 2m.
7. In order to prevent the electric current induced by the hanging wire from injuring people, each pole wire is required to be electrically connected to the hanging wire. Each pulling wire position should be installed with a pull-type ground wire. The hanging wire is required to be directly connected with a bushing ring and directly grounded at the terminal.
8. Aerial optical cables are usually 3m above the ground. When entering a building, they must pass through the U-shaped steel protective sheath on the exterior wall of the building, and then extend downward or upward. The aperture of the optical cable entrance is generally 5cm.
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