The complete naming of wires and cables is usually more complicated, so people sometimes use a simple name (usually a category name) in combination with the model specification instead of the complete name, such as "low voltage cable" represents all plastic insulation of 0.6/1kV class cable.
1. Why does a single-core cable jacket ground in one end of the cable must be installed with a return cable laid parallel to the cable?
Answer: In the cable line grounded at one end of the metal sheath, in order to ensure that the induced voltage in the sheath does not exceed the allowable standard, a conductor laid in parallel along the cable line must be installed, and both ends of the conductor are grounded. This conductor is called back Streamline. When a single-phase ground fault occurs, the ground short-circuit current can flow back to the center of the system through the return line, and the magnetic flux generated by the ground current through the return line cancels the magnetic flux generated by the ground current of a part of the cable conductor and can be reduced. The induced voltage of the sheath in the event of a short circuit.
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2. Can cable engineering be divided into several projects?
answer:
(1) Site transportation: Including the loading, unloading and transportation of engineering materials from the warehouse to the construction site and return of empty vehicles.
(2) Local projects: including road excavation, tunnels, and trench construction.
(3) Laying project: including laying, intermediate head making, flipping cover plate, buried pipe, school tide, traction head making and so on.
(4) Both ends of the project: including the production and installation of supports, suspension bridges and their foundations, the production of terminal heads, the installation of oil pressure and signal devices, and the testing of electrical properties.
(5) Plug and stop project: including the production of oil-filled cable plugs and heads, installation of fuel tanks, automatic drainage and signal devices, etc.
(6) Grounding: Including insulation joints, transposition boxes, protectors, and grounding box installation.
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This micropipette enables true one-handed operation without changing the holding position: adjust volume, Pipette, remove tip.
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