1, strip out the copper core of the cable on the tube heat exchanger for about30-35mmlong, use emery cloth to clean the copper wire until it becomes shiny. Also strip out the copper wire of the external three-core cable30-35mm, wipe clean with emery cloth.
2, Plug the stripped copper wire part of the three-core cable and the external cable together. Then tie it tightly with a thin copper wire. Cut off the remaining part and press it flat with scissors to avoid pricking your hands.
       3. Weld the three wire ends firmly with solder. The surface of the welding head is required to be smooth and free of burrs and false welding. If it is not welded firmly or is not smooth, it should be re-welded until it meets the requirements.
       4. When wrapping with polyester non-conductive tape, press half of the initial circle. bandage8-12layer, after wrapping. Wrap it twice with plastic tape for strength.
       5. Use plastic tape to wrap the three wires together in two layers. One layer is larger than each wire, and the non-conductive layer at the end is larger than50mm.
       6. After bandaging, take a basin of cold water and soak the bandaged threads in the water.12hours later, use500VMegohmmeter measuring non-conductivity cannot be lower than50Megohm, otherwise it should be re-bandaged until it meets the requirements.
       7,Tube and tube heat exchangerThe grounding wire must also be wrapped according to the requirements of the diving cable wiring process.