How To Fully Understand The Inflation Axis

1. Fully understand the structure, performance and characteristics of the inflation shaft, and understand the model, specifications, types and adaptation sites of the inflation shaft.
2, should be proficient in the laying, installation methods, methods and skills of the inflatable shaft, understand the precautions in the construction, such as the bending radius of the inflation shaft, the arrangement of the laying, how to enter and exit the distribution box, cabinet, how to pay attention Eliminate eddy currents.
3. Familiar with the accessories of the inflation shaft and the installation and use methods of each accessory.
4. Understand the special tools required for the installation of the expansion shaft and master the use method.
5. Familiar with the construction drawings and site conditions, and formulate detailed construction plans.
6. During the laying process of the air-expansion shaft, or after laying and installing, it is necessary to strictly prohibit the electric welding faucet wire from being dragged or collided on the air-expansion shaft, because the electric welding faucet with electricity and the copper sheath of the air-expansion shaft (Equivalent to the grounding wire) generates a welding spark, so that the copper sheath is melted, causing holes in the copper sheath of the inflatable shaft, causing moisture in the air to be absorbed by the magnesium oxide insulation, and the insulation resistance of the inflation shaft is lowered. Sometimes, because the fault segment that creates the hole is not found, it is mistaken to think that there is a problem with the product of the inflation shaft manufacturer. This must be taken seriously.
7. During the laying and installation process, the insulation of the air-expansion shaft should be measured and the problems should be dealt with in a timely manner. Before and after the air-filled shaft is laid and before and after the production of the terminal and the intermediate joint, the insulation resistance of the air-expansion shaft should be measured several times and compared before and after to ensure that the air-expansion shaft quality of each installation process is intact. At the same time, regardless of the interruption or suspension of the expansion shaft, or to be placed for a period of time before construction, the end of the expansion shaft must be timely in order to avoid the moisture of the magnesium oxide insulation.
8. After the terminal head and the intermediate head of the air-expansion shaft are made, perform an insulation test immediately. After 24 hours, measure again. If the inflation shaft head is not damp, the protective layer is not damaged. In actual test, The pointer of the European watch should point to “∝”, which indicates that the inflation shaft has good insulation performance. If the insulation resistance value is found to decrease in the second test, the fault point should be found. Generally speaking, the fault point is at the terminal or the intermediate joint. When searching, you can use the torch flame at the lower part of the terminal, and the two ends of the middle joint. Heating, while measuring the insulation resistance of the inflatable shaft, after a few seconds of heating, the insulation resistance value drops sharply, indicating that there is a problem with the terminal or the middle head. At this time, it should be removed and redone until it is qualified. If the insulation resistance does not change, check other terminals or intermediate heads on the line until the point of failure is found and repaired as described above.
9. After the air-expansion shaft is laid, if there is no intermediate joint, the terminal can be directly used. If there is an intermediate joint, the intermediate joint should be made first, otherwise the trouble of checking the phase will be increased.
10. The copper sheath of the inflatable shaft can be used for grounding and must be grounded.