1,Strip the copper core of the cable on the tube heat exchanger to a length of about 30-35mm, and wipe the copper wire with emery cloth to make it shine. Similarly, strip the copper wire of the external three-core cable to 30-35mm, and wipe it with emery cloth.
2. Connect the three-core cable with the copper wire part of the external cable. Then tie it tightly with a thin copper wire. Cut off the rest and press it flat with scissors to avoid sticking your hands.
3. Solder the three wire ends with solder respectively. The surface of the welding head is required to be smooth without 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. Bandage 8-12 layers, after wrapping. Wrap two more layers of plastic tape for strength.
5. Wrap the three wires together with plastic tape, wrap them in two layers, and one layer is larger than the end of the non-conductive layer of each wire is larger than 50mm.
6. After bandaging, take a pot of cold water and soak the bandaged wire ends in water. After 12 hours, use a 500V megohmmeter to measure the non-conductivity and cannot be less than 50 megohms, otherwise it should be re-wrap until it meets the requirements.
7. The ground wire of the tube heat exchanger should also be wrapped according to the requirements of the submersible cable wiring process.
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