NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Locator Suppliers
Common knowledge of cable installation Basic knowledge of cable installation Common knowledge of cable installation 1. The distance between the mine cable and the heat pipeline should be connected at a distance of 2m when placed in parallel, and 0.5m should be connected when they are intertwined. 2. When the cables are placed in parallel or interlaced with other pipes, they should be connected at a distance of 0.5m. 3. When the cable is directly buried, the depth of the 1-35kV cable should not be less than 0.7m.
4. The net distance between 10kV and the following cables is not less than 0.1m when they are placed in parallel, 10-35kV is not less than 0.25m, and the distance when weaving is not less than 0.5m. 5. The minimum bending radius of the cable, the multi-core cable shall not be less than 15D, and the single-core cable shall not be less than 20D (D is the outer diameter of the cable). Six, 6kv and above cable discussion.
A. When placing the cable terminal, it is necessary to strip off the semi-conductive barrier layer, and the insulation shall not be damaged during operation. Knife marks and unacceptable environments should be prevented, and sandpaper should be used to smooth it when necessary; the end of the barrier should be flat, and the graphite The layer (carbon particles) is broken and cleaned. B. The copper shield and steel armor at the end of the plastic insulated cable must be well grounded, and this criterion should also be followed for the short-circuit line to prevent the electromotive force from being felt at the end of the steel armor when the three-phase unbalanced operation occurs, and even"fire"and incineration of the sheath, etc. The grounding lead wire should be made of tinned braided copper wire, and soldered with a soldering iron when connecting with the cable copper tape.
C. The three-phase copper shield should be connected to the ground wire respectively, the fine shield ground wire and the steel armor ground wire should be drawn out separately and insulated from each other, and the position of the welding ground wire should be as low as possible. Seven, the basic requirements for the cable end and center discussion: a. The conductor is connected well; b. The insulation is reliable, and it is recommended to use the radiation cross-linked heat shrinkable silicone rubber insulating material; c. The sealing is excellent; d. The sufficient mechanical strength, Can adapt to various operating conditions. 8. The cable end must be waterproof and corroded by other corrosive materials to prevent breakdown due to the aging of the insulating layer caused by water trees.
9. Crane or forklift must be used for the loading and unloading of cables. Flat transportation and flat laying are prohibited. When placing large cables, a cable car must be used to prevent the cables from being damaged by external forces or scratching the insulation layer due to manual dragging. 10. If the cable cannot be laid in real time for some reason, it should be stored in a dry place to prevent sunlight exposure and water entering the cable end. Secondly, it is also a link that cannot be underestimated, that is, the acceptance inspection of the installed cables should be carried out to see if there are any omissions.
1. First, ask the user to check to see if the cable is damaged, and the construction personnel will test the resistance and insulation resistance of each cable with a multimeter to confirm whether the cable resistance is normal and the insulation is normal, and record it. 2. Please check and accept the entire laying by the user's supervisor. The main items of acceptance are: A) Whether the laying of the insulation layer is smooth; B) If the reflective film is installed, check whether the laying of the reflective film is smooth; C) The installation of barbed wire Whether it is flat and fixed. D) After the heating cable is energized, whether the surface temperature of the cable has increased significantly, and sign the acceptance form for confirmation.
Basic knowledge of cable installation Common sense of cable installation Shenzhen Noyafa Electronic Technology Co., Ltd.
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