Arrange too dense, building cable installation, ventilation cooling effect is not good, or cable near too close to other sources of heat, affected the normal heat dissipation of the cable, may also cause cable heating phenomenon in running. Joint manufacturing technology is bad, no pressure to close, cause whenelectrified resistance is too large, also will cause the cable to produce hot phenomenon. And cable insulation is not good, cause the insulation resistance is small, also can produce in the operation of the heating phenomenon. The armored cable, local sheath damage cause slow damage to insulation performance, after the water gradually reduce insulation resistance, can cause heating phenomenon in the operation of the cable. Power cable produce heating phenomenon, if you don't find out why timely troubleshooting, continuous electric cable to continue after the operation will produce heat insulation breakdown phenomenon.Cable causing interphase short circuit trip phenomenon, serious may cause fire.
The nonmetal material of the sample used to volume was only about a third of the class C is 0.5 L/m.Time to 20 min and requirement for fire burning height less than 2.5 m is the same as the class C.Because the wire and cable proposal is yet to be adopted by a vote. In addition, the IEC 332-3 has A regulation, namely A class A test, if the sample get interval arrangement (there is A core of conductor is greater than 35 was occasion) in front of the standard ladder arrangement not bottom, can be arranged at the back, and expressed in AF/R.Or use wide type of ladder (0.8 m wide) all rows in front of the ladder (AF), and with double burner for the fire.But if large size in the standard flexible flat cable ladder front row, with a single burner for the fire, still write for AF.To simplify the model, for this kind of situation both for ZA.
1, large capacity.The same cross section of a Flexible Cable current transmission capacity of 3 to 5 times that of conventional cable.
2, low loss.Superconducting cable used in liquid nitrogen vaporization temperature (about 196 ℃) without resistance to transmit large current, conductor loss less than one over ten of the conventional cable, and the energy loss in the refrigeration, the running total loss is only 50% to 60% for conventional cable.
3, no pollution.Conventional superconducting cable will not pollute the environment, and an oil filled cable then there is the danger of environmental pollution by oil.
4, saving material.One kilogram of superconducting cable can finish 77 kg common cable transmission capacity, greatly saves the traditional copper consumption.Same superconducting cable transmission capacity compared with the conventional cable, use less metal and insulating materials.
5, low noise, low electromagnetic pollution using superconducting cable.
6, small volume, saving power transmission system of the area and space, save a lot of valuable land resources.
7, high safety and reliability, basically eliminate fire hazards.
Coaxial Cable is refers to the two concentric conductor, the conductor and shield and share the same axis of Cable.It is widely used in computer network and a wire.Due to its insulating material, outside the main package on the outside of the insulation material and a layer of shielding mesh wire mesh weaving, so can very good block electromagnetic interference of the outside world, improve the quality of communication. With coaxial cable has the advantage of can in a relatively long WuZhongJi device support high bandwidth communication on line, and its shortcomings are obvious: one is a large volume, the diameter of the fine line is 3/8 of an inch thick, take a lot of space cable pipe;2 it is unable to bear tangles, pressure and severe bending, which will damage the cable structure, prevent signal transmission;Finally is high cost, and it is twisted pair can overcome all the shortcomings, so in the current domain network environment, has been based on twisted-pair Ethernet physical layer specification is replaced.
If you want to truly understand the installation temperature and material laying low temperature brittle temperature relations, is a larger research project, from materials, flexible wire cable, construction construction (or copy) and so on each link of sampling test, the system to find the critical point of damage, so need a lot of resources and manpower support.Once the figure it out, in turn, to the enterprise is also a great feedback.
In GB/T 5470-2008 in plastic brittle temperature impact test method can know, plastic is needed in a variety of utility under the condition of bear or withstand the impact of low temperature bending.Processing orientation, thermal history, when the wire and cable costs when the force imposed on the material, especially the speed force will affect the brittleness of polymers.When an application of deformation conditions similar to the conditions specified in the test method, the brittle temperature can be used to predict the plastic material behavior at low temperature.Brittle transition temperature test for measuring the polymer lost toughness "glassy" temperature.
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In the world of aerospace wire and cable, there are many different options to choose from. Aerospace cables have to be tough enough to withstand the needs of high speed aircraft applications. These tend to be small in diameter, light in weight, and able to weather extremely high temperatures. Because aircrafts and other machines that are used in this field are subject to extreme weather conditions, the wires used as well as all other internal parts have to be specifically durable for safety reasons.
Small gauge wire may be spooled on a 10-inch plastic spool that has a center core length of 5 to 6 inches and holds up to 10,000 ft. Certain factors determine the spool size you will need; one important factor is how the wire will be used in the manufacturing process.
If the wire manufacturer usually cutLight Duty PVC Insulated PVC Sheathed Flexible installation Cables their wire by automated machine, the spool size or Drum size may be critical. For example, using an automated machine, a large Drum of wire can be gone in as little as 30 minutes, depending on thze length of the cut. Cost is another factor. As an added benefit for a large reel size or Drum Packs, many distributors offer discounts on bulk reels.
With all of their unique abilities, value-added services conveniently customize while offering solutions for precise wire and cable specifications. As an additional advantage, purchasing wire and cable from a value-added manufacturer proves to be cost-effective because everything you need can be completed in a single location by one vendor.