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There are often the following types of insulated wires: PVC insulated wires, PVC insulated flexible wires, nitrile PVC mixture insulated flexible wires, rubber insulated wires, agricultural underground buried aluminum core plastic insulated wires, rubber insulated cotton textile flexible wires, PVC insulated nylon sheathed wires, PVC insulated flexible wires for electric power and lighting, and so on.

Commonly used electrical accessories are cable terminal junction box, cable center junction box, articulation and terminals, steel wiring troughs, cable bridges and so on.

Connecting cable and cable conductor, insulation shielding and maintenance layer, in order to make the cable line connection equipment, known as the cable center connector.

The following aspects should be considered:
(1) the cable for a long time promised to go through the operating current.
(2) once the thermal stability of the short-circuit.
(3) the voltage drop on the line can not exceed the promised operating range.

The selection of power cables should follow the following guidelines:
(1) the additional voltage of the cable should be greater than or equal to the additional voltage of the power supply system at the point of equipment;
(2) The continuous allowable current of the cable should be equal to or greater than the maximum continuous current of the supplied load;
(3) Core cross-section to meet the requirements of the power supply system short-circuit stability;
(4) According to the power supply system, the cable should be able to meet the requirements of the power supply system short-circuit stability.
(4) According to the length of the cable to check whether the voltage drop meets the requirements.
(5) The minimum short-circuit current at the end of the line should be able to make the maintenance equipment operate reliably.

The fixture should be free of iron to form a closed magnetic circuit, this is because when the cable core through the current, the magnetic lines of force occurring around it, the magnetic lines of force and the current through the core of the magnitude is proportional to the use of iron and other magnetically conductive materials, according to the electromagnetic induction can be known, will be in the iron parts of the eddy currents in the cable heating, or even burned out of the cable. So do not use iron for single-core communication cable fixed fixture.

The biggest feature of heat shrinkable accessories is to replace the traditional stress cone with stress tube, which not only simplifies the construction process, but also reduces the size of the terminal of the connector, easy to equip, saves time and labor, has superior function and saves metal. Heat-shrinkable cable accessories set of perfusion and dry pack type as a whole, mobilizing the strengths of these two accessories.

(1) bracket should be complete, well-painted.
(2) cable type, voltage, standards in line with the planning.
(3) cable insulation is outstanding, when in doubt about the sealing of the oil paper cable, moisture judgment should be carried out; direct buried cable and small bottom cable should be qualified by the DC voltage test difficult; oil-filled cable oil samples should be qualified.
(4) oil-filled cable oil pressure should not be less than 1.47MPa.

The cable insulating paper point or into the 150 ℃ cable oil view, no “hissing” sound or white foam presents, the elucidation is not damp.