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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04
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16
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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16
Browse times：40
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
As the name suggests, the wire grounding line is actually a line that connects with the earth. It can also be called a safety circuit line when it is said. When there is an emergency danger, the existing high voltage is directly converted to the earth. It can be said to be a safety line. Regarding the specification of the grounding wire of the electric wire, the national electric power industry has strict requirements. In order to avoid the accidental high-voltage danger in the equipment and the line of the power outage, the wire grounding wire specification shoul...
发布时间:
2019
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04
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16
Browse times：25
The cable adopts chlorinated polyethylene process mainly for mixing, extrusion and vulcanization. The cable is made of chlorinated polyethylene.I. Mixing process 1. The chlorinated polyethylene element does not contain double bonds in the main chain, and the process of mechanical plastics is difficult to cut, and it does not affect the viscosity of Mooney, so no mastication is required.2. CPE glue can be mixed by an open mill, and it is also suitable for mixing with an internal mixer. Before mixing with an open mill, it is first necessary to confirm that the CPE is in t...
发布时间:
2019
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04
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16
Browse times：56
Flame-retardant wire means that the experimental circuit is in a burning state in a specified environmental environment. When the fire source is extinguished, the spread of the fire will be limited to the specified range, and the residual flame on the cable can be extinguished by itself within the specified time. The characteristic of the flame-retardant cable is that the cable in the fire environment will stop running due to being burned out, and it will also prevent the fire from spreading, and control the combustion range to a local extent to ensure the safety of other equipment and avoid f...
发布时间:
2019
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04
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16
Browse times：20