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:Will the computer master, external DVD burner how external power supply, please click details. Thank you!
- Do not say the price of the words than the single-core cable better than the single, the other is not much difference, personal hobbies. I have installed and met 90 percent are equipped with multi-core line!
- Q:Will the two 16 square copper wire with what specifications of the trunking
- How to say that interference is certainly some, if you line less words on one or two in the bridge next to do a tube it! The pipe will be a little better. Upstairs that I do not think that although in practice the construction of this practice a lot, because you do not feel the interference, but the reality does interfere with, or science should not be strong and weak must be separated.
- 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: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:110 voice patch panel directly to the telephone line can be connected to it
- One type is a wireless digital TV, if the upper left corner shows no signal, one is possible arrears to the business hall to inquire; the other may be affected by weather or buildings, adjustable outdoor receiving antenna , You can contact the wireless TV company to replace the equipment or repair if you are checking the other connectors by means of a bridge. The second category is the satellite receiving antenna, mainly the satellite antenna is not adjusted, according to the instructions to adjust the satellite receiver until the signal received. The third category is a cable digital TV, one is the cable line failure, resulting in no signal input, can consult the service phone; the other is the TV receiver unit failure, you can replace the TV try;
- Q:Power Cable Check Well b-type covers show what?
- A grade steel fiber concrete inspection covers are used for airports or special roads and venues for expressways that can take off and land for helicopters
- Q:Why my home analog TV connected to the digital TV set-top box after the screen is black and white
- Cabling in the integrated wiring system according to the network topology diagram to configure how to connect, no network topology is unable to give the correct connection.
- Q:What recycled rubber is suitable for the production of wire and cable?
- Symmetrical receptacles need to be treated differently, with color distinctions most convenient.
- Q:Water and electricity installation drawings in the kz on behalf of what material of the threading tube
- HDMI interface common in some new TV, which is called "digital high-definition multimedia interface", mainly for the transmission of high-quality, lossless digital audio and video signals to high-definition television, the maximum bandwidth of 5Gbps In addition, There is also an interface you need attention, this interface is called "DisplayPort", it can provide the same function with the HDMI interface, and can provide bandwidth up to 108Gb / s, much higher than the HDMI interface More importantly, DisplayPort is free Standard (HDMI charges), almost all of the personal computer manufacturers and graphics card manufacturers have expressed support for this interface
- Q:What is the length of the wire that affects voltage and electricity
- Can go if you do not trust to wear a pvc into the bridge on it
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