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:How to connect the power cable pre-branch connector
- Pre-branch cable should be fully cooled before the plate can be installed, otherwise it will cause the connection flat, affecting the appearance of packaging should pay attention to branch and trunk The end of the seal, to prevent the core of the water
- Q:How to convert the computer's audio and video to cable TV signals. Through the cable television transmission to the 40 TV (hurry)
- The first is to buy a computer connected to the TV dedicated audio and video lines, length specifications are: 1.8 meters, 5 meters, 10 meters, 15 meters and 20 meters, etc., everywhere sold here do not do a detailed introduction to the first step: , S-terminal video cable connection S plug the end of the line into the video on the S terminal port, while the other end of the S-terminal line into the TV behind the S terminal port, the connection is completed (Figure 1); if you You can use the "S-AV adapter" supplied by OUR to connect the S-terminal connector to the S-terminal cable, and then insert the AV head of the other head into the AV video input after the TV Mouth, the connection is completed (Figure 2). . the audio cable connection will be the audio line of the two Lotus head were inserted into the TV after the left and right channel audio input port, while the audio cable 3.5mm audio head into the audio card audio output port, the connection is completed. If you need to use the "one sub-two audio frequency line", then its 3.5mm audio head into the audio card audio output port, speakers (headphones) and audio lines were inserted into the "one two audio frequency line" 3.5 Encyclopedia of Germany, Germany and Germany Bao Bao mother on the mouth, the connection is completed
- Q:Cable yjv-0.6 / 1kv-4 * 120 + 1 * 70 What does it mean?
- Note: Refer to 10kV and below Cable Trench Construction Standard and Acceptance Specifications Chapter III Cable Trench and Well Construction Standard Article 3
- Q:What are the requirements for the spacing between the strong and weak wires?
- with a white cable to facilitate the distinction between the cable
- Q:Fourth, what causes the power cable fire accident
- Once the cable in the event of fire, the fire ferocious, rapid spread, in the burning will occur when a large number of harmful gases, resulting in fighting difficulties
- Q:Why does the sparrow stand on the wire without electric shock?
- the network patch panel is now more mainstream network system patch panels, generally every 1U height can accommodate 24 8-core network port, back line, front jumper plug in addition, look at the Google Encyclopedia on the 110 patch panel instructions, found a little problem, that is 110 patch panel documents, but the picture is not 110 patch panels, that should be called Kelon, we also Called this thing for the VDF, it should be noted that the 110 system is AT & amp; T, that is, Lucent (Lucent) company's standards, and Kelon is the German Kelon (kelone) company's standard, not the same thing, Dragon frame is generally used in large-scale voice wiring system, and generally fixed for the wall, if placed in the standard cabinet will have to install the backplane, the Kelon frame steel frame fixed on the backplane The 110 patch panel is a standard 19-inch equipment, can be directly fixed in the standard 19-inch cabinet As the 19-inch standard cabinet has been widely used in the civilian areas, so Kelon is now less application, mainly in the use of operators these with a number of tattoo and fat ancient mix of full-chip cable is integrated wiring system in the most basic connector, the product range is also very much on the market, of course, there are many changes in the form On the use of network patch panels and 110 patch panels, Google Encyclopedia and the library have a detailed description, you can refer to
- Q:How to find the phone number on the 110 patch panel
- Put a piece of paper in the dog's urine, whenever the dog to think about urine when the dog's nose smell, put the paper in the designated place, more training a few dogs will be.
- Q:1omoons / days sensitive quad-core network set-top boxes can be used on old-fashioned televisions.
- Network set-top box does not require a computer, only need to follow the operating manual set-top box and TV connection, and then boot the wired / wireless network configuration, with set-top box software can watch the video program. 4M do not see the basic high enough, but now the Chinese network is shared bandwidth, if the use of many people may be cardton
- Q:What is the difference between the control cable and the compensation cable?
- 240MM copper cable can be, casing with DN150 load 473KW how current only 560A, a little do not understand, you are not wrong
- Q:3 (WDZBN-YJV-4x240 + 1x120) cable how to interpret
- 3 (WDZBN-YJV-4x240 + 1x120) cable is a low smoke halogen-free flame retardant (B grade) XLPE insulated - PE sheathed copper core power cable. The model of the cable is usually composed of eight parts: First, the use of code - not marked as the power cable, K for the control cable, P for the signal cable; so the power cable. Second, the insulation code -Z oil-impregnated paper, X rubber, V polyvinyl chloride, YJ cross-linked polyethylene; so for the cross-linked polyethylene insulation. Third, the conductor material code - not marked as copper, L is aluminum; therefore copper. Four, inner layer code-Q lead package, L aluminum bag, H rubber sleeve, V PVC jacket; so for the PVC jacket. . derived code-D no drip, P dry insulation. Sixth, the outer layer code. . special product code-TH wet tropical, TA dry tropical, ZR- (flame retardant), NH- (fire), WDZ- (low smoke zero halogen, enterprise standards); so low smoke halogen-free flame retardant The . rated voltage - unit KV; general cable are marked, the problem is estimated to write missing 0.6 / . the use of: rated phase voltage of 0.6KV, line voltage of 1KV. In the cable, 4 * 240 + 1 * 120 that there are 4 core 240 square copper wire, a 1-core 120 square copper wire.
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