First of all, we need to understand the cable installation notes:
A mine cable and heat pipe should be placed in parallel when the distance between the 2m, should be linked to 0.5m.
Two, the cable and other pipelines in parallel or interleaved to be placed when the distance between the 0.5m.
Three, cable buried placement, 1-35kV cable buried depth should be less than 0.7m.
Four, 10kV and the following cable placed in parallel when the distance between each other is not less than 0.1M, 10-35kV not less than 0.25m, when the distance is not less than 0.5m.
Five, the minimum bending radius of the cable, multi-core cable shall not be less than 15D, single core cable shall not be less than 20D (D for the cable diameter).
Six, 6kV and above cable discussion.
A. for cable terminal, required stripping semi conductive barrier layer, operation may damage the insulation, should prevent against marks and level of environment, need to use sandpaper; barrier end should be flat, and the graphite layer (carbon) coming clean.
B. plastic insulated cable end copper barrier and steel armor must well grounded, the shortest route should also follow the principle of three-phase unbalanced operation, prevent the steel armor end feel electromotive force, and "fire and burning accident sheath. The ground leads to adopt tin and copper braided wire, cable connection by soldering iron, should not be used to avoid the loss of insulation welding torch.
C. three copper barrier should be connected with a ground line, detailed barrier grounding wire and steel armored earthing wire should be insulated from each other are led, welding wire should be as far as possible on the lower position.
The basic requirements of seven, the cable end head and center of discussion: A. conductor adjacent well; B. insulation reliable, recommend adoption of radiation crosslinked heat contraction type silicon rubber insulation material; C. sealing machine well; strength D. enough, can adapt to all kinds of operation conditions.
Eight, cable ends must be waterproof, corrosion and other corrosive materials, so as to prevent the insulation aging caused by water treeing breakdown.
Nine, the cable must be used for loading or unloading crane or forklift, flat, flat, large cable placement should be used to release the cable car, in order to avoid damage to the cable by external force or because of artificial drag and scrape insulation layer.
Ten, if you cannot real-time cable laying, should be put in dry place for storage, sunlight exposure, water and other cable ends.
Secondly, is also an important link, is to carry out the inspection and acceptance of cable installation, see if there are omissions.
First, please see that user acceptance, the cable is damaged, and the construction personnel for testing and insulation resistance of each cable multimeter, to confirm whether the normal cable resistance, insulation is normal to be recorded.
The supervision personnel two, please the user acceptance of the main laying, acceptance of the project is: A) the insulation layer is smooth; B) such as installation of reflective film, reflective film, check whether the formation of laying; C) the installation of barbed wire is flat, fixed. D) after the heating cable is energized, the surface temperature of the cable has been significantly improved, and signed on the acceptance form.
