I. Characteristics of the cables
1. Using factory prefabrication methods can substantially reduce the site construction labor intensity and shorten the construction laying time;
2. Use of cables can guarantee great length and bending property, and greatly facilitates the construction in a complex place;
3. Use of cables reduces the laying space, and cables can be installed together with gas and hydraulic gas pipelines;
4. Their reliability and reliability can be fully guaranteed, for the cables are manufactured in the factory,
5. Sub-branch parts should use high strength sealed joints, which are waterproof and have properties of moisture protection, long-term maintenance and free for repair;
6. Because the cables are directly connected with households with no need of maintenance and repair and with easy and simple construction, the cables can produce significant comprehensive economic benefits.
II. Usage of the cables:
1. To be used for high-rise building;
2. To be used for disaster prevention equipments;
3. To be used for tunnel lighting and disaster prevention equipments;
4. To replace copper bus bar with small or medium capacity in various places.
III. Standards of the cables
IEC 60502 Rated Voltage 1 ~ 30KV extruded insulated power cables and accessories (International Electrotechnical Commission standards)
GB 12706 Rated voltage 35KV and below Copper core, Aluminum core plastic insulated power cable (National Standard of the People's Republic of China)
JCS 376 branch cable (Japanese Electric Wire Industry Standard)
General Rules for JIS C2810 indoor wiring electrical connection pipes (Japanese Industrial Standard)
Types of the cables:：
Standard main cables and branch cables are all low-voltage power cables with XLPE or PVC insulation materials (IEC, GB, JIS, BS ... ...), and PVC materials covered on the outer side. Generally, the main cable is single-core or twisted multi-core cable (cables with two to five cores), the branch cables are single-core cables, and may adopt a fire-resistant, flame retardant cables in accordance with the requirements.
Their structures and types are as follows:
three cores twisted type
four cores twisted type
five cores twisted type
PVC insulated PVC sheathed branch cables
PVC insulated PVC sheathed flame-retardant branch cable
PVC insulated PVC sheathed fire-resistant branch cable
Cross-linked polyethylene insulated PVC sheathed branch cables
Cross-linked polyethylene insulated PVC sheathed flame-retardant branch cables
Cross-linked polyethylene insulated PVC sheathed fire-resistant branch cable
- Q:The living room to the bedroom cable does not work
- 1 TV inside the 400V filter capacitor damage 2 audio and video cable connection is not good or poor quality 3 you put the TV volume dots, set-top box volume can be improved
- Q:What is the heat of the cross-linked cable?
- Video cable refers to the transmission of video signals (VIDEO) cable, can be used as a monitoring system for signal transmission
- Q:Cable yjv-0.6 / 1kv-4 * 120 + 1 * 70 What does it mean?
- There is no difference between BTTZ25 square can only do single core. BTTZ is a kind of outer layer with seamless copper tube jacket, the middle filled with magnesia crystal powder as insulation material, the conductor is a single strand of copper rods composed of new cables, in recent years are also more used in high-rise buildings, airports, Underground railways and other places, to protect the fire in the case of fire pumps, fire elevators, local lighting, emergency evacuation instructions, security monitoring, anti-smoke system and self-powered power and other important equipment uninterrupted operation. The main features of the editor it has a high temperature, fire, explosion, no combustion (250 ℃ can be a long time running, 1000 ℃ limit state can also be 30min short time operation) and the current flow, small diameter, high mechanical strength , Long service life, generally do not need the characteristics of independent grounding wire. Application range Editor Widely used in nuclear power plants, metallurgy, chemical industry, mine, kiln and other dangerous, bad, high temperature environment. In recent years, more applications in high-rise buildings, airports, docks, subway and other places, to protect the fire in the case of fire pumps, fire elevators, local lighting, emergency evacuation instructions, security surveillance, anti-smoke system and self Power and other fire fighting and important equipment without interruption.
- Q:Will the computer master, external DVD burner how external power supply, please click details. Thank you!
- You can shop on the ground floor of a layer of waterproof carpet (that is, the rural common 'kang seats'), the wire shop in the following, at the desk to stay a outlet hole, and the jack or electrical connection. Carpet can be bought in the hardware building materials store, as the traces of tape, you can go to the big supermarket to buy a special scrub, ask the salesman on the line. Wish you the best at work
- Q:Power cable inspection, how many meters should be sampled?
- meaning: ZR represents the flame retardant properties YJ said cross-linked polyethylene insulation V said PVC jacket ZR-YJV table red copper core XLPE insulated PVC sheathed power cable 4 * 70 + 1 * 35 said 4 core 70mm2 + 1 core 35mm2
- Q:Pvc threading tube packaging film how to do attractive, on the grade it? Thank you great god
- If the upstairs said that the number of troughs in China. I am doing strong electricity. It is entirely possible.
- Q:Choose the configuration of good or bad computer graphics card memory processor, etc., how to choose a different manufacturers
- Calculation method: the amount of engineering calculation formula: L = (pipe length calculation + wire reserved length) × with the number of cross-section wire. Note: plastic pipe should not be flattened, cracks, no debris in the tube, cut the mouth should be flat, the nozzle should be shaved plastic wire pipe connection using glue bonding, plastic pipe bonding must be tightly tight, and in the pipeline plug on the plastic pipe plug, to prevent the paddle, plug tube concrete floor, wall and brick structure of the various switches, socket bottom box , The lamp junction box and the pipe connection must be connected with the wiring, is strictly prohibited plastic pipe directly into the junction box dark in the concrete junction box requirements with wet cement paper or plastic foam filled with internal, not allowed to use The cement paper packs its outside. Embedded in the floor, the shear wall of the plastic pipe, the junction box should be fixed firmly to prevent the shift
- Q:How high voltage armored power cable is grounded
- When the armor leads directly to ground to buy the cable terminal, the manual has a specific production process
- Q:What is the length of the wire that affects voltage and electricity
- When the cable is laid on the multi-layer bracket, the cables are arranged from top to bottom, the first layer is the high voltage cable, followed by the low voltage power cable. The control cable is placed on the lower part of the power cable. At the bottom of the instrument cable, when the low voltage power cable With the instrument cable in the same layer of laying, should be added partition isolation. Computer communication coaxial cable, full length are required to shield the use of closed trunking.
- Q:Wire inside the two lines, red and black, black line is the line of fire or zero line ah?
- . 1.8.7 / 10kV U value of 10KV, which can withstand the maximum voltage of 12KV8.7 / 15kV U value of 15KV, which can withstand the maximum voltage of 17.5KV2.8.7 / 10kV is 10KV system in the first Class II cable (fault time can be greater than 1 minute) 8.7 / 15kV is the first type of cable in the 15KV system (failure time is not more than 1 minute) 3.U0 / UU0 - conductor and insulation shield between the voltage U - the The voltage between the conductors is two, the cable is usually a few or several groups of wires [at least two] stranded from the rope similar to the cable, each group of wires insulated from each other, and often around a central twist The entire outer package has a highly insulated cover. Multiple in the air or in the ground, underwater, for telecommunications or power transmission.
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