Cable docking is often encountered in power projects. In the past, electrical tape was used for winding. However, in some places with strict fire protection, electrical tape may cause safety hazards. So today, the editor of Duwai will give you some tips. The heat-shrinkable tube used for connecting cables can withstand a voltage of 600V and can provide absolute insulation protection for low-voltage cables. The following describes the correct use of cable heat-shrinkable tubes.

1. Select the heat shrink tube according to the outer diameter of the cable. The most direct way is to use a caliper to measure the outer diameter of the cable. If you don’t have a caliper, you can also use an ordinary ruler. It doesn’t have to be particularly precise. When estimating the wire diameter, it needs to be about 1mm larger. Don't estimate too low. The outer diameter of my cable is 3mm. I chose φ4mm heat shrinkable tube here because after the wires are connected, the diameter of the wire ends will become larger. If the heat shrinkable tube is smaller, the heat shrinkable tube will not fit in.

2. Cut a section of heat shrink tubing. The length depends on the length of the joint. For example, my joint is 10mm long. In order to increase the strength of the joint, you can cut off a 30mm long heat shrink tubing to prevent it from being placed in place. Leave a 10mm margin on both sides.

3. Before the wires are connected and knotted, put the heat shrink tube on the cable and move it aside.

4. Strip the wires to expose the cable conductors, butt and tie the cables. If possible, you can use a soldering iron to solder them to increase the firmness. If my strength is not allowed, I will ignore the welding steps.

5. Move the heat shrink tube to the conductor joint position, leaving a little margin on both sides.

6. Heating and shrinking, adjust the temperature of the hot air gun to 120°C, from left to right or from right to left, from top to bottom or from bottom to top, depending on your mood. There is no fixed direction, but it must be from one end to the other. Shrink in sequence, never shrink the two ends first and then the middle. This will cause bubbles to appear in the middle, resulting in loss of protective effect. The shrinking method of the heat shrink tube depends on the conditions. You can use a lighter or a hair dryer.

7. If multiple cables are connected, a large heat shrink tube needs to be used to fix all the cables together.

It is relatively simple to use heat shrink tubes to connect cables. After using heat shrink tubes to connect cables for a long time, the electrical tape will not deglue or crack.