Under different environmental conditions, outdoor cables can be laid in a variety of ways, such as pipe, direct burial, overhead, and so on. Outdoor weak electric cable laying method Daquan.The laying of outdoor cables should meet the following conditions:The bending radius of the cable is greater than 15 times of the diameter; the power cable should be separated from the signal and control wires; the outdoor equipment should be connected to the cable, because the wiring is connected from the lower part of the equipment; the cable is selected according to the required length of each segment to...
发布时间:
2019
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04
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Browse times：43
Check the insulation performance of the cable and verify that the insulation properties of the supplier are stable. How to check the insulation of the cable?For large-volume cable products, sampling inspection methods can be used to check the tensile strength, elongation at break, dielectric strength, volume resistivity, volume resistivity, oxygen index and density of the product.Check the parameter data on the insulation package of the circuit. The national standard genuine circuit insulation package has clear indication: the name of the manufacturer, the type and name of the material, the da...
发布时间:
2019
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Browse times：129
The service life of the cable has an important impact on the safety of the cable system. The service life of the cable mainly depends on the oxidation induction period of the sheath material. Although the effective use period of the ordinary cable is theoretically 20 years, the actual service life is far more than the actual service life. this. The cause of cable aging in life is that the insulation is reduced and the breakdown is caused. The insulation of the conductor cable is reduced, which is the fuse that causes the cable to be physically damaged and the life is shortened.。What are the fa...
发布时间:
2019
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04
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Browse times：114
The choice of cable cross-sectional area is not only related to the loss, quality and cable life of the circuit system, but also affects the investment of engineering projects. If the cross-sectional area of the cable is too small, the voltage quality will be degraded, the line will be excessively lost, and the investment cost will be increased invisibly. How to choose the right cross-sectional area cable? According to the overall equipment power planning, circuit load forecasting selection, theoretically, the suitable cross-sectional area of the cable is required at the maximum working voltag...
发布时间:
2019
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Browse times：77
I. Cable laying In the wiring project, the common laying methods of cables mainly include direct burial laying, pipe laying, shallow trench laying, cable trench laying, cable tunnel laying, and overhead laying. These laying methods have their own advantages and disadvantages. Which ones need to be applied in actual construction depends on factors such as building density, cable line length, number of required cables and surrounding environment.In terms of construction difficulty, cable tunnel laying and cable trench laying are more convenient for construction and ...
发布时间:
2019
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04
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Browse times：42
The most important material of the cable is the core. The different functional cables have different standards for the core. The following is a detailed description of the quality of the different functional cable cores. The control cable is equipped with a copper core as standard. The power cable has an aluminum core and a copper core material. However, the power supply and the large-scale power supply of the system usually use a copper core, which is an ideal conductor material for the cable. What is the main quality of cable for different purposes? &...
发布时间:
2019
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04
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16
Browse times：125