What are the processes of communication cable?
1. Power cables, control cables and communication cables shall be laid out in different channels. The cable trench shall be equipped with a firewall and marked by standards, and fire retardant materials shall be added to the outer cable. Power cables and communication cables are strictly prohibited.Two: all through the walls, floor and cable channel into the control room, cable interlayer, control cabinet and dashboard at the end of the cable cable holes; corridor; the bottom of the entrance and the top cable shaft through the floor should be closed.Three: open cable ditch, the application of a complete, sturdy cover plate good. The cable layer and ditch shall be kept clean, and no sundries or rubbish shall be piled up. When there is an open fire nearby, measures shall be taken to prevent the fire from entering the cable layer and trench.Four: the laying of cables should be avoided near the heat source, and avoid steam pipes parallel or cross *, hot pipes in the tunnel or ditch, can not be laid cable, if necessary laying, insulation measures should be taken.Five: in the cable trench, according to the environmental characteristics and importance of the cable, the operation is reliable, convenient and economical and reasonable. Under the circumstances, the cable with flame resistance is selected.Six: in strict accordance with the relevant procedures, regular running cable inspection, testing and maintenance, trench lighting and fire facilities should always maintain good condition.
A communication circuit consisting of a plurality of insulated wires or conductors, which has a sealing sheath outside, is provided with a cable core. Some outside the sheath is also equipped with an outer protective layer. There are overhead, direct buried, pipeline and underwater and other laying methods. According to the structure is divided into symmetrical and coaxial cable and comprehensive; according to the functions for the field and permanent cable (underground submarine cable). Communication cable has wider frequency band, larger communication capacity and less interference from outside, but it is not easy to overhaul. Capable of transmitting telephones, telegrams, data, images, etc..
In the cable trench or cable wells, using a blowtorch note:1, familiar with the use of safety precautions blowtorch personnel are not allowed to use a blowtorch.2, must check whether the oil cylinder oil burner before use, fire nozzle blockage, thread leaks, oil consumption is tooMore (should not exceed the oil tank volume 3/4), refueling screws are tightened, or no ignition.3, blowtorches shall comply with the following provisions in use:(1) the nozzle shall not be directed towards people or inflammable materials when igniting.(2) the pressure in the oil cylinder can not be too high. Kerosene or alcohol use prohibited injection gasoline blowtorch.(3) work as much as possible in the air circulation. In the vicinity of flammable and explosive materials and near the transformer oil switch places are not allowed to use a blowtorch or point fire.(4), not to put in the high temperature of the burner body.(5), and put the oil and gas burner flame removing mouth or other parts of the work, must treat the spray nozzle pressure relief after cooling.(6), after use, should be placed as far as a pressure to be cooled before being placed in the toolbox.(7) using a blowtorch, flame and conductive part distance shall not be less than that in the voltage of 10 thousand volts and below: 1.5 meters, 3 meters above 10 thousand volts: [1]
