Installation And Maintenance
1. The loading and unloading of cables must be performed using a crane or forklift. It is strictly prohibited to transport or lay cables horizontally to prevent damage from external forces or abrasion caused by manual dragging. When installing large cables, a cable reel must be used to avoid improper operation or reckless construction practices.
2. All installation sites must be free of standing water to prevent moisture from entering the cables during installation and operation, which could affect their normal use.
3. Before construction, the cable ends must be sealed and protected to prevent water ingress and corrosion from other corrosive materials, which could cause rusting and discoloration of steel or copper bands, oxidation of conductors, and aging of insulation layers leading to breakdown.
4. When cables are installed parallel to thermal pipelines, a distance of 2m must be maintained. When crossing, a distance of 0.5m must be maintained. When cables are installed parallel to or crossing other pipelines, a distance of 0.5m must be maintained. When cables are directly buried, the burial depth for 1-35kV cables must be no less than 0.7m.
5. For cables of 10 kV and below installed in parallel, the minimum clear distance between them should be no less than 0.1 m; for cables between 10 kV and 35 kV, no less than 0.25 m; when crossing, the distance should be no less than 0.5 m.
6. The cable laying temperature should not be lower than 0°C, and the bending radius of the cable must be greater than or equal to 20 times the diameter of the cable.
7. 6 kV and above cable joints
(1) When installing cable terminations, the semiconductive shielding layer must be removed. During the process, the insulation must not be damaged, and cuts or uneven surfaces must be avoided. If necessary, sandpaper should be used to smooth the surface. The shielding end must be flat, and the graphite layer (particles) must be thoroughly removed.
(2) The copper tape shielding and armor of plastic-insulated cable terminals must be properly grounded to prevent induced electromotive force at the armor end during three-phase unbalanced operation, which could lead to “sparking” or burning of the sheath. The grounding lead-out wire should use tinned braided copper wire, and when connecting to the cable copper tape, use a soldering iron for soldering; avoid using a torch for welding to prevent damage to the insulation.
(3) The three-phase copper tape shielding should be connected to the ground wire separately. Note that the shielding grounding wire and armor grounding wire should be drawn out separately and insulated from each other. The welding position of the grounding wire should be as low as possible.
8. Basic requirements for cable ends and intermediate joints: a) Good conductor connection; b) Reliable insulation; c) Good sealing; d) Sufficient mechanical strength to adapt to various operating conditions.
9. If cables cannot be laid promptly due to unforeseen circumstances, they should be stored in a dry location to prevent exposure to sunlight, water ingress at cable ends causing short circuits, conductor oxidation, and corrosion of other materials, which may affect the service life of the cables.
Note: Cable installation should be performed by personnel familiar with cable performance or dedicated technical staff. If any matters remain unclear, please consult the relevant technical department or our company's technical department.
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