Requirements for the installation of power cables in the bridge

　　1、Cable bridge turns bending radius，It is not less than the minimum of the cable in the bridge.
Table);
The minimum allowable bending radius of the cable:
1) The rubber insulated power cable of lead -free bag steel armor clock 10D
2) A rubber insulation electric cable with steel armor 20D
3) Polyethylene insulation power cable 10D
4) Lingle -crossing Pigvonethylene insulating power cable 15d
5) Multi -core control cable 10D
Note: D is the outer diameter of the cable

　　2、When the design is not required，Cable bridge -level installation of the bracket distance is 1.5 to 3m; the spacing of the bracket installed vertically is not greater than 2m;

　　3、When the aluminum alloy bridge and steel bracket are fixed，Anti -electrical corrosion measures with inter -insulation。Narut is located outside the bridge;

　　4、Cable bridge is laid below the flammable and explosive gas pipeline and thermal pipe，When there is no design requirements
time，The minimum net distance from the pipeline meets the requirements (see Table); the minimum net distance (m) pipe category is parallel to the net distance:
General process channel -0.4  0.3
Flammable and Easy Explosive Gased Pipe -0.5  0.5
The thermal pipe has a thermal insulation layer -0.5  0.3
No warm layer -1.0  0.5

5. Cable laying in the bridge shall comply with the following regulations:
a、 Cables greater than 450 tilted cables are set at a fixed point every 2M;
b、Cable in and out of the cable groove、Erad well、Building、cabinet (plate)、Power and Pipe Pipes to seal;
C、Cable laid arrangement neatly，Cable laying horizontally，End of the first and tails、Fixed points on both sides of the corner and every 5 to 10m; the end of the cable、The end and the branch should have a signboard; laying in
Fixed point spacing of the cable in the vertical bridge frame (see Table)。The spacing of the cable fixed point (MM) cable type fixed point is full -plastic.