With the rapid development of the power cable buried laying project and the higher requirements for cable protection, the cable protective sleeve is made of polyethylene PE and high quality steel pipe, pre-treated by sand blasting, dip or coating, and cured by heating. Crafted. It is an electrically insulated tube commonly used to protect wires and cables. Because it has good insulation performance, high chemical stability, no rust, no aging, and can adapt to harsh environments, it is widely used.
Special considerations for cable line installation:
(1) Cable lines are concealed, which is more complex than overhead lines and has potential unsafe factors. The nameplate must be carefully checked before the cable line work begins.
(2) The power cable has a certain capacitance and has charge and discharge characteristics. Before the cable is powered off, before the grounding, the cable withstand voltage test and before and after measuring the insulation resistance, the cable should be fully discharged phase by phase.
(3) Medium voltage user incoming cable, when directly connected to the distribution transformer, the user's low voltage total knives must be pulled open and listed to prevent low voltage side power transmission.
(4) When overhauling or rerouting multiple cables laid side by side. Cables must be carefully identified; safety measures such as electricity inspection, discharge, and grounding should be implemented for power outages; inspection of cable lines should always consider that the lines are live.
(5) When the cable is under pressure test, a warning sign or a guard must be attached at the other end.
(6) Before entering the cable work well or tunnel work, the flammability and toxic and harmful gas content should be tested and exhaust measures should be taken. The work well should be provided with a retaining ring and guarded by someone.
(7) Strictly observe the rules for the use of open flames near electrical equipment.
(8) Underwater cable maintenance, life jackets should be worn on the ship.
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