Precautions
Precautions for Power Cable Installation
1. Cable handling and loading/unloading must be performed using cranes or forklifts; flat transportation and laying cables horizontally are strictly prohibited to prevent external forces from damaging the cables or causing abrasions due to manual dragging. When installing large cables, cable-releasing vehicles must be used to avoid improper operations and rough construction practices.
2. All cable-laying sites must be free of standing water to prevent moisture from entering the cables during installation and operation, thereby ensuring their normal functioning.
3. Before construction, the cable ends must be sealed and protected to prevent water ingress and erosion by other corrosive materials, which could cause discoloration and rusting of the steel tape and copper tape, as well as oxidation of the conductor and aging of the insulation layer, ultimately leading to breakdown.
4. When cables are installed parallel to thermal pipelines, they should maintain a distance of 2 meters. When cables cross thermal pipelines, they should maintain a distance of 0.5 meters. When cables are installed parallel to or crossing other pipelines, they should maintain a distance of 0.5 meters. When cables are directly buried, the burial depth for 1-35 kV cables shall not be less than 0.7 meters.
5. When cables of 10 kV and below are installed in parallel, the minimum clear distance between them shall be no less than 0.1 m; for cables between 10 kV and 35 kV, the minimum clear distance shall be no less than 0.25 m. When cables cross each other, the minimum clearance shall be no less than 0.5 m.
6. The cable laying temperature shall not be lower than 0℃, and the cable bending radius must be greater than or equal to 20 times the cable diameter.
7. Cable joints for 6 kV and higher voltage cables
(1) When installing cable terminations, the semiconducting shielding layer must be stripped off. During this process, the insulation must not be damaged, and any knife marks or uneven surfaces should be avoided. If necessary, use sandpaper to smooth out these areas. The shield end must be flat, and any graphite layers (particles) must be thoroughly removed.
(2) The copper tape shielding and armor of plastic-insulated cable terminations must be properly grounded to prevent induced voltages from developing at the armor ends during unbalanced three-phase operation, which could lead to arcing, ignition, and even jacket burning. The grounding lead should be made of tinned braided copper wire, and when connecting it to the cable’s copper tape, soldering with a soldering iron is recommended; flame-soldering should be avoided to prevent damage to the insulation.
(3) The three-phase copper tape shielding should be connected separately to the ground wire. Note that the shielding ground wire and the armor ground wire should be led out separately and kept electrically insulated from each other. The welding location of the ground wire should be as low as possible.
8. Basic requirements for cable terminations and intermediate joints: a) Good conductor connection; b) Reliable insulation; c) Excellent sealing; d) Sufficient mechanical strength to withstand various operating conditions.
9. When cables cannot be laid promptly for any reason, they should be stored in a dry place to prevent exposure to sunlight and water ingress at the cable terminations, which could lead to short circuits, conductor oxidation, and corrosion of other materials, thereby affecting the cable’s service life.
Attention: The installation of wires and cables should be carried out by installers who are familiar with the performance of wires and cables or by dedicated technical personnel. If any uncertainties remain, please consult the relevant technical department or our company’s Technical Department.
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We primarily manufacture ten major product series, including communication and mining RVVZ-series cables, power cables, control cables, flame-retardant and fire-resistant cables, rubber-sheathed cables, shielded cables, high- and low-voltage insulated overhead conductors, pre-branched cables, mining cables, and various types of bare wires.
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