There are two methods for laying overhead optical cables:
1. Hanging wire type: First fasten the cable on the pole with the hanging wire, then hang the optical cable on the hanging wire with the hook, and the load of the optical cable is carried by the hanging wire.
2. Self-supporting type: A self-supporting optical cable is used. The optical cable is in an "8" shape, and the upper part is a self-supporting wire. The load of the optical cable is carried by the self-supporting wire.
The laying requirements are as follows:
1. When laying optical cables in a flat environment in an overhead way, use hooks to hang them; lay optical cables in mountains or steep slopes, and use binding methods to lay optical cables. The optical cable connector should be located at a straight pole position that is easy to maintain, and the reserved optical cable should be fixed on the pole with a reserved bracket.
2. The optical cable of the overhead pole road is required to make a U-shaped telescopic bend every 3 to 5 blocks, and about 15m is reserved for every 1km.
3. The overhead (wall) optical cable is protected by galvanized steel pipe, and the nozzle should be blocked with fireproof mud.
4. Overhead optical cables should be hung with optical cable warning signs every 4 blocks around and in special sections such as crossing roads, crossing rivers, and crossing bridges.
5. A trident protection tube should be added to the intersection of the empty suspension line and the power line, and the elongation of each end should not be less than 1m.
6. The pole cable close to the road should be wrapped with a light-emitting rod, with a length of 2m.
7. In order to prevent the induced current of the suspension wire from hurting people, each pole cable must be electrically connected to the suspension wire, and each pulling wire position should be installed with a wire-pulled ground wire.
8. The overhead optical cable is usually 3m away from the ground. When entering the building, it should pass through the U-shaped steel protective sleeve on the outer wall of the building, and then extend downward or upward. The aperture of the optical cable entrance is generally 5cm.