Basic Knowledge of Cable Installation

Whether the cable is installed correctly or not is directly related to our personal safety, so it is very important to learn the correct cable installation method. First of all, we need to understand the precautions for cable installation: first, when the mining cable is placed in parallel with the heating pipeline, it shall be connected with a distance of 2m, and when interleaved, it shall be connected with a distance of 0.5m. Second, when the cable is placed in parallel or interleaved with other pipelines, it shall be connected with a distance of 0.5m. 3、 When the cable is directly buried, the direct burial depth of 1-35kV cable shall not be less than 0.7m. IV. when the cables of 10kV and below are placed in parallel, the clear distance between each other shall not be less than 0.1M, 10-35kV shall not be less than 0.25m, and the distance during interleaving shall not be less than 0.5m. V. the minimum bending radius of the cable shall not be less than 15d for multi-core cable and 20d for single core cable (D is the outer diameter of the cable). 6、 Discussion on 6kV and above cables. A. When placing the cable terminal, the semi-conductive barrier layer must be stripped off. The insulation shall not be damaged during operation. Knife marks and the environment with high and low resistance shall be prevented. If necessary, it shall be polished with sandpaper; The end of the barrier shall be flat, and the graphite layer (carbon particles) shall be broken and cleaned. B. The copper barrier and steel armor at the end of plastic insulated cable must be well grounded, and this criterion should also be observed for short routes to prevent electromotive force at the end of steel armor during three-phase unbalanced operation, even ignition and burning of sheath. Tinned braided copper wire shall be adopted for grounding outgoing line. Soldering iron shall be used for soldering when it is adjacent to cable copper strip, and blowtorch shall not be used for sealing welding to avoid burning insulation. C. The three-phase copper barrier shall be connected with the ground wire respectively. The detailed barrier ground wire and steel armor ground wire shall be led out separately and insulated from each other. The position of the welding ground wire shall be as low as possible. 7、 Fundamental requirements for cable terminal and center discussion: A. excellent conductor connection; b. The insulation is reliable. It is recommended to adopt radiation crosslinked heat shrinkable silicone rubber insulation material; c. Excellent sealing; d. Sufficient machine strength can comply with various operation conditions. 8、 The cable end must be waterproof and corroded by other corrosive materials to prevent breakdown caused by aging of insulation layer caused by water tree. 9、 Crane or forklift must be used for cable loading and unloading to prevent horizontal transportation and placement. Cable car must be used for large cable placement to avoid external force damage to the cable or scratch the insulation layer due to manual drag. 10、 If the cable cannot be laid in real time for some reason, it shall be stored in a dry place to prevent sunlight exposure, water inflow at the cable end, etc. Secondly, it is also a link that can not be underestimated, that is, it is necessary to conduct acceptance inspection on the installed cables to see if there are omissions. 1、 First, the user shall check and accept the cable to see if it is damaged, and the construction personnel shall test the resistance and insulation resistance of each cable with a multimeter to confirm whether the cable resistance and insulation are normal, and record it. 2、 The supervision personnel of the user are invited to accept the whole laying. The main acceptance items are: a) whether the insulation layer is laid smoothly; B) If reflective film is installed, check whether the laying of reflective film is smooth; C) Whether the barbed wire mesh is installed smoothly and fixed. D) After the heating cable is energized, check whether the surface temperature of the cable has increased significantly, and sign on the acceptance sheet for confirmation.

Basic Knowledge of Cable Installation 1

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