The laying of Outdoor cables shall meet the following requirements:


1. When the communication pipeline is used, the pipe hole shall not be shared with the communication cable.


2. When the cable is laid in the trench, it should be laid on the bracket or in the cable slot. When the cable enters the building, the cable trench and the building should be isolated and sealed.


4.3.13 the clear distance between signal line and electrical equipment with strong magnetic field and electric field shall meet the following requirements:


1. When unshielded cables are laid through metal protective pipes or in closed metal trunking, it should be 0.8m; when directly laid, it should be greater than 1.5m.


2. The shielded cable should be larger than 0.8m.


4.3.14 when laying cables, the minimum bending radius of multi-core cable shall be greater than 6 times of its outer diameter; the minimum bending radius of coaxial cable shall be greater than 15 times of its outer diameter; the minimum bending radius of optical cable shall be greater than 20 times of its outer diameter.


4.3.15 the utilization ratio of cable trough laying section shall not be greater than 50%, and that of cable laying through pipe shall not be greater than 40%.

4.3.16 when the cable is laid along the support or in the cable trench, the following requirements shall be met:


1 when the cables are vertically arranged or the slope exceeds 45 °, the cables shall be firmly fixed on each bracket.


2 when the cable is horizontally arranged or the slope is not more than 45 °, the cable shall be firmly fixed every 1-2 supports.


3. The cable shall be firmly fixed at 150-300 mm in front of the junction box and junction box.


4.3.17 junction box or pull box shall be installed under the following conditions, and the installation position shall be convenient for threading:


1. For the non bend pipeline, add one when the pipeline length exceeds 30m.


2 there is a turn between the two guy points, and one is added every 20 m of pipeline length.


3 there are two turns between the two pulling points, and one should be added when the length of pipeline exceeds 15m.


4. There are three turns between the two guy points, and one should be added when the length of pipeline exceeds 8m.


4.3.18 the fixed clamp shall be set at the turning point of the pipeline or every 1.5m of the straight distance.


4.3.19 for the vertically laid wire pipe, a junction box for fixing the wire shall be installed every 10m according to the cross-sectional area of the wire passing through, and the conductor shall be fixed in the box with insulated clamp.