Generally, in the cable line, the defect of insulating water is more affected by external factors, and most of the defects (non external force damage) occur in the installation link of the cable line. Whether in theory or in practice, the installation of heat shrinkable cable accessories is the top priority, because the installation process is directly related to the work safety of cable lines, so it is necessary to popularize some requirements for the installation of heat shrinkable cable accessories.

1¡¢ Preparation before installation:

1. When making the cable head, the tools to be used must be prepared. The construction personnel shall be familiar with the use, inspection and precautions of various tools and instruments.

2. Before making the heat shrinkable cable head, the required heat shrinkable materials and supporting materials shall be prepared, whether the materials are qualified shall be checked, and whether the heat shrinkable materials are appropriate shall be determined according to the cable structure and specification.

2¡¢ Requirements for installation:

1. The cable shall be stripped, cut, sheathed with heat shrinkable materials and other operations in accordance with the provisions of the product installation manual.

2. Cleaning is the key point to ensure the installation quality. What needs special attention is the cleaning of the cable insulation surface.

3. When heat shrinkable pipe fittings are coated with metal parts such as wiring terminals and metal sheath, the metal parts shall be heated to 60-70 ¡æ to obtain good sealing effect.

4. When using liquefied gas spray gun and blowtorch to heat shrinkable pipe fittings, attention shall be paid to the flame temperature. The flame shall move radially around the material to ensure that the diameter shrinks evenly before extending slowly. The recommended initial shrinkage position and direction in the process shall be followed to facilitate gas discharge.

5. Attention should be paid to eliminate the residual gas inside the heat shrinkable cable accessories. Generally, the cable accessories are filled with insulating glue to eliminate the internal air gap, while the heat shrinkable cable accessories eliminate the residual gas inside by the shrinkage of the heat shrinkable pipe. Therefore, in addition to the appropriate shrinkage ratio of heat shrinkable materials, the internal gas shall be effectively excluded in the design of accessories and process measures.

6. Pay great attention to the crimping process of aluminum terminal (or copper terminal) at the terminal of heat shrinkable cable accessories. It is not allowed to press through. The specified crimping die shall be used according to the process requirements. The crimping depth shall also meet the standard and shall not be too deep. If there is a crimping phenomenon, it is easy to cause moisture and rain to invade the wire core, which will cause insulation breakdown over time. Therefore, from the point pressure process, it is difficult to control the depth of the pressure pit. It is recommended to use confining pressure, because the confining pressure will not press through the wiring terminal.

During the installation and construction of heat shrinkable cable accessories, it is strictly prohibited to damage the cable sheath and insulation. At the same time, when the heat shrinkable intermediate connector is not completely cooled, it is not allowed to move the cable.