Underground XLPE insulated power cables and overhead insulated cable

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Q:Calculate the control cable under what circumstances the cable terminal needs to be calculated
" Why should the closed wall or protective wall closed on the second side of the closed junction box? This need to understand if you do not add this closed junction box, what kind of harm Civil air defense project in the closed wall is divided into the clean area and the area of ​​the infected area, and the wire tube in the thread after the inside is a cavity, directly through the wall to communicate with the cleaning area and exposed areas, so wartime works outside the dyeing The poisonous air can penetrate into the clean area through the cavity inside the wire tube, which is harmful to the personnel inside the project And the installation of a sealed junction box, you can thread in the line after the box filled with sealing material to block the tube cavity connectivity This is why the electrical safety pipe in the air defense project must pass the closed wall or protect the closed wall when the two sides must be closed in the closed junction box reasons
Q:What is the use of wire and cable per square meter of residential building?
According to the provisions of GB-. pipes with a diameter of 15 mm can wear 3 BV-2.5 or 2 BV-4; and so on, 20 mm pipe, 3 * 4 or 4 * 2.5; 25 mm pipe, * 6 mm or 5 * 4; 32 mm tubing, wear 3 * 10 or 5 * 6; 40 mm tubing, wear 4 * 16 or 5 * 10; 50 mm tubing, wear 4 * 25 or 5 * 16 The The combination of the above, generally can be applied to all the current distribution lines of the way. As for the 35 square millimeters above the wire, the general use of cable laying, do not use PVC pipe, you can see the environment as a result of the application or wear pipe protection.
Q:Apple mobile phone does not support this charge when charging this thing how to charge
Can not! "Power Cable Design Code" Article 5.1.3 provides that the number of stents by the channel space constraints, 35kV and about the adjacent voltage level of power cables, can be arranged in the same layer of stent. 10kV power cable (actually 8.7 / 10kV) and 380V power cable (actually 0.6 / 1kV) in the interval between the 6kV and 3KV two voltage levels, not the adjacent voltage level, can not!
Q:Why does the AC welding machine burn out the equipment?
Electric workers in the wood when the wood bar, buried in the soil that part of the first use of fire char, and then brush into the ground after the bitumen
Q:What is the radiation of the laser scanning scanner?
The shield has two types of semi-conductive shield and metal shield
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:The difference between power cable and overhead cable
Insulation structure is not the same, the number of core is not the same. Power cable generally 3-4 phase, overhead cable general core. Power lines can be divided into overhead lines and cable lines. Overhead lines with less investment, easy construction and maintenance, easy maintenance and repair advantages, the disadvantage is the natural conditions (wind, snow, ice, lightning, etc.) have a greater threat to operational safety. In order to save the country's construction funds, the general use of overhead lines is appropriate. However, when the conditions are subject to restrictions (such as overhead lines laid in difficult or special requirements), the use of cable lines. Cable and overhead lines compared to poor heat dissipation, it should be considered in the short-circuit conditions of thermal stability. Therefore, in addition to high-voltage cable cross-section in accordance with the economic current density, allowing voltage loss, long-term allowable current selection, but also according to short-circuit thermal stability conditions for verification.
Q:Water and electricity installation drawings in the kz on behalf of what material of the threading tube
Color line, HDMI cable, S-terminal line of the three transmission video signal (HDMI can also transmit audio signal); coaxial line is the transmission of audio signals
Q:Lighting wire, I do not know is it. The When to use BV1 * 2.5, when to use 2 * 2.5, when to use 3 * 2.5, when to use 4 * 2.5,
This is generally not very good replacement, and you ask is not very specific, the proposed problem is more clear, more convenient for you to answer.

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