How To Prolong The Service Life Of The Cable

- Apr 08, 2018 -

(1) The distance between the cable and the heat pipe should be 2m when installed in parallel, and 0.5m when crossing.

(2) Keep a distance of 0.5m when the cable is installed parallel or crosswise to other pipes.

(3) When the cable is directly buried, the depth of direct burial of the 1-35kV cable shall not be less than 0.7m.

(4) For the parallel installation of 10kV and below cables, the mutual clear distance is not less than 0.1m, 10-35kV is not less than 0.25m, and the distance when crossing is not less than 0.5m.

(5) The minimum bending radius of the cable shall not be less than 15D for multi-core cables and 20D for single-core cables (D is the cable outer diameter).

(6) 6 kV and above cable connectors: a. When installing the cable terminal, the semi-conductive shielding layer must be stripped, and the insulation must not be damaged during operation. Tool marks and irregularities should be avoided. If necessary, sandpaper should be used to flatten the shield. The Ministry should be smooth and remove the graphite layer (carbon particles). b. The copper shield and steel pick of plastic insulated cable ends must be well grounded. This principle should also be followed for short lines to avoid induction dynamics at the end of the steel bar during unbalanced three-phase operation, even for “fire” and fire protection. Sets and other accidents. The grounding lead wire should be tinned and galvanized with tinned copper and copper cable, and should not be sealed with a torch to avoid burning insulation. c. The three-phase copper shields shall be connected to the ground wires respectively. Note that the shield grounding wire and the steel wire grounding 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) Basic requirements for cable end and intermediate joints: a. Conductor connection is good; b. Insulation is reliable, it is recommended to use radiation-crosslinking heat-shrinkable silicon rubber insulation material; c. Seal well; d. Sufficient mechanical strength, Can adapt to various operating conditions.

(8) The end of the cable must be waterproofed and corroded by other corrosive materials to prevent breakdown due to aging of the insulating layer caused by water trees.

(9) Cranes and forklifts must be used for loading and unloading cables. It is forbidden to lay flat and lay flat. When large cables are installed, the cable car must be used to prevent the cable from being damaged by external forces or scratching the jacket and insulation layer due to manual dragging. The cable is not installed, it is strictly forbidden to use human hand to make the conductor bent to damage the insulation layer and produce a short circuit.

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