The sheathed wire is a double-core or multi-core insulated wire with a plastic sheath. Its shape is as shown on the right. It has moisture, acid and corrosion resistance. The sheath wire can be directly laid in the hollow floor and the building. The surface of the object, using the line card as the support of the wire, the construction method of the sheath wire laying is simple, the line is neat and beautiful, and the cost is low. At present, the splint, the slot plate and the porcelain bottle are clearly arranged on the inner surface of the building, and Widely used in electrical lighting and other distribution lines, but the sheathed wire should not be directly buried in the plastering layer, and should not be laid in outdoor open spaces.
The plastic insulation layer of the sheathed wire has the functions of moisture proof, anti-corrosion and anti-electricity. The outermost insulation layer of the sheathed wire can effectively protect the internal wires from damage and increase the service life of the wires.
The sheathed wire can be directly embedded in the wall or directly secured to the sheathed wire through the threading groove. A sheathed wire is a layer of plastic rubber that blocks two-core and multi-core wires. To put it simply, it is the outermost layer of rubber that we usually see as "wires."
What are the specifications of the sheathed wire?
The sheathed wire is a sheathed wire and cable. The sheathed wire is only a common name. The general sheathed wire refers to the RVV cable and the BVV series wire and cable. The RVV cable is a soft sheathed wire, and the BVV is a hard sheathed wire. The following is a comparison of the parameters of the two sheathed wires:
1. Full name: RVV full name PVC insulated PVC sheathed flexible cable; BVV full name PVC insulated PVC sheathed cloth wire;
2, structure: whether it is a soft sheathed wire or a hard sheathed wire, there is an obvious feature, that is, the outer layer of the wire is composed of a layer of sheath, the bread is covered with wires, and the RV cable is wrapped with RVV cable. The BV line is a hard-sheathed BVV cable. Material: The sheath material of the commonly used sheathing wire is polyvinyl chloride, that is, PVC plastic. Executive standard: GB standard; Quality standard: 3C certification;
3. Product code: RVV soft sheathed wire is 277IEC53; BVV hard sheathed wire is 277IEC10;
4. Conductor: The conductor of the RVV soft sheathed wire is composed of oxygen-free copper wire, so the wire body is soft, the BVV hard sheathed wire is composed of BV wire, and the BV wire conductor is single-stranded conductor, so it is hard.
Sheath line construction wiring teachingAfter learning what a sheathed wire is, let's learn about the wiring of the sheathed wire:
The preparation of the sheathing line, the scribing and the laying protection tube are the same as those described in the previous lessons, except that the distance between the support points of the sheath line should be 15 cm to 20 cm. The fixed distance is 5 to 10 cm, as shown in the figure below, which is the position of the sheath line support point.
Fixed line card: On the wall or wooden structure with plaster layer, you can directly fasten the line card with small cement nails (do not make the nail cap protrude to avoid scratching the outer sheath of the wire), and lay it on concrete or steel structure. When sheathing the wire, an epoxy-bonded aluminum wire card can be used in the same manner as the bonding plate.
Laying sheathed wire
Putting the line: The pay-off work is an important part to ensure the laying quality of the sheathed wire. Therefore, the wire can not be disturbed, and the wire cannot be twisted. When the wire is released, two people need to cooperate. One person puts the whole wire in the hands and the other will The wire head should be pulled straight forward, and the discharged wire should not be dragged on the ground to avoid damage to the sheath layer. If the line is short, in order to facilitate the construction, the wire can be cut according to the actual length and a certain margin.
Straight application: In order to make the line neat and tidy, the wire should be laid horizontally and vertically. When laying, hold the wire with one hand and fix the wire to the line card with the other hand, as shown in Figure (A) above, if the line is long or has several protections When the sets of wires are laid in parallel, the clamped sheath wires can be clamped into the splint by temporary clamping, as shown in the above figure (B), and then the wires are twisted and tightened one by one, and finally the wire is hammered by hand or wooden hammer. Gently pat flat so that it fits snugly against the wall. When laying vertically, it should be done from top to bottom for ease of operation.
The operation of the line card clamping sheath line is as shown in the figure below (if it is a steel nail line card, it can be directly pressed and bound). During the laying, it should be checked while operating, and the skew distortion should be corrected in time.
Bending: When the sheathed wire turns on the same wall, it must be kept perpendicular. The curved wire should be even and the bending radius should not be less than 3~6 times of the sheath wire specification.
Precautions
When using plastic sheathed wire for indoor use, the cross-section shall have a copper core of not less than 0.5 mm2 and an aluminum core of not less than 1.5 mm2. When using plastic sheathed wire for outdoor use, the cross-section shall be such that the copper core shall not be less than 1.0 mm2, aluminum core Not less than 2.5mm2;
The plastic sheathed wire cannot be directly connected on the line, and the wire end connection can be connected through a porcelain joint, a junction box or a terminal pile borrowing other electrical appliances;
When the sheath wire passes through the wall and the floor (or in a place susceptible to mechanical damage), the protective tube shall be worn, and the protruding wall surface distance is about 3 to 10 mm;
When the sheathed wire is in close contact with various pipes, a protective pipe shall also be installed;
When the sheath wire is directly concealed in the hole of the hollow floor, the hole should be cleaned, and the wire in the middle of the hole is not allowed to have a joint.
The sheath wire runs through the dark line, is there a safety hazard?Generally used is no problem! But if it is used for a long time and the current electrical power is so big!
Suggestion: If there is a proposal for high-power appliances, except for air conditioners, ovens, etc., there is no problem with normal households.
What is the difference between a wire and a cable?1. Cables and wires are generally composed of three components: core wire, insulating sheath and protective sheath. The wire consists of one or a few soft wires, and the outer bread is made of a soft protective layer; the cable is made up of one or several insulated wire and is covered with a tough outer layer made of metal or rubber.
2. There is no strict limit between the two. Generally, a product with a small number of cores, a small product diameter, and a simple structure is called a wire, a non-insulated wire is called a bare wire, and the other is called a cable; a conductor having a large cross-sectional area (greater than 6 square millimeters) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and insulated wire is also called a wire. Cables generally have more than 2 layers of insulation, and most are multi-core junctions.
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