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:Ipad charge does not enter the charge does not support this accessory charge
- Friends, my task, hope to adopt! Answer: sorghum (Liang) explained: the poles are relatively high, beautiful riding on the poles is in the height of their own beautiful, so according to the meaning of harmony, the answer is sorghum.
- Q:What is the difference between a pre-branch cable and a punched clip?
- Cable bridge is used to support and protect a variety of cables, in power plants, substations, large industrial and mining enterprises, high-rise buildings are widely used. But are a one-time infrastructure in place, usually no longer replace and add.
- Q:"Cable laying" cable cross-sectional area refers to the cable cross-sectional area, or refers to the copper core cross-sectional area
- YJV22 indicates "copper core XLPE insulated, steel tape armored PVC sheathed power cable" 0.6 / 1KV indicates its pressure rating, 5 * 10 represents the cross-sectional area of each wire diameter Is square mm, referred to as the square, the diameter of the conversion is 4.05
- Q:What is the meaning of "cable tray: 200 * 100 middle strip" in electrical engineering
- Two should be phase line, generally in the three-phase loop corresponding to the color: A phase is yellow, B phase green, C phase red, neutral (that is, zero line) for the blue. If only in the single-phase loop only red and green when the default is red for the phase line, green for the zero line. But not necessarily, some electricians do not follow the requirements, the specific you have to use the pen to know what the
- Q:How long is the service life of the cable?
- For corrosive environments, cable trays with suitable corrosion resistant coatings should be used
- Q:What is the fire wire pipe laying? What is the galvanized steel pipe?
- Inverter special cable General power cable difference shielding requirements higher, the number of cores is generally 3 +. three lines of the ground line of three symmetrical and phase line intersection. Variable-frequency (VFD) is the application of frequency conversion technology and microelectronics technology, by changing the motor operating frequency mode to control the AC motor power control equipment. The inverter is mainly composed of rectifier (AC variable DC), filter, inverter (DC variable AC), brake unit, drive unit, detection unit micro-processing unit and so on. The inverter will adjust the voltage and frequency of the output power by the breaking of the internal IGBT, according to the actual needs of the motor to provide the required power supply voltage, and then achieve the purpose of energy saving, speed control, in addition, the inverter has a lot of protection , Such as overcurrent, overvoltage, overload protection and so on. With the continuous improvement of industrial automation, the inverter has also been a very wide range of applications.
- Q:Computer host configuration of about 1,000 yuan (preferably 1000 below) - probably as follows;
- Cable trench as a power construction project should be cable trench construction construction design, cable trench construction program, according to the previous design requirements and programs in order to develop cable trench construction quality acceptance procedures
- Q:What kind of material should be selected for the fixing bracket of the cable trunking
- Should be caused by power line interference. You can buy a shield with the copper wrapped in audio cable and then placed next to the power cord can be, electronic city should have to sell.
- Q:Can 110kv and 10kv cables co-share with trenches? What is the relevant specification?
- With a straight pipe with a matching pipe (commonly known as the hoop), in order to prevent the joints at the slippery, PVC glue can be used after the smear. If the trouble, then use the electrical cloth cloth to the two tube package can also be strict.
- Q:Emergency power off after the computer can not open the machine, an open is a lot of words appear seconds limit, you can
- There is a collection of. There is a direct connection, there are T then. Electric well trunking without cover, how can be connected
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