Before the end of the thread is disconnected, it should be gently pressed with wire pliers, and then wound to the mouth, and then swing around, the end of the thread will be very attached to the joint is disconnected. If the joint is in a dry place, wrap two layers of insulating black cloth first, then wrap two layers of plastic adhesive tape (also called PVC adhesive tape), and then wrap two or three layers of J-10 insulating self-adhesive tape by stretching 200%, and finally wrap two layers of plastic adhesive tape. Because of the direct use of plastic tape shortcomings: plastic tape for a long time easy to dislocation, glue open; When the electrical load is heavy, the joint heats up and the plastic tape is easy to melt and shrink. The power connector presses each other in the junction box. When the connector is burr, it is easy to poke empty plastic tape, etc. These hidden dangers directly endanger personal safety, cause moderate lines, and cause fire. And the use of insulating black tape will not appear above the situation, it has a certain strength, flexibility, can be wrapped tightly in the joint for a long time, affected by time and temperature and dry fixed type, will not fall off, and flame retardant. In addition, with insulating black tape wrapped and then wrapped tape can be moisture-proof and rust-proof. Of course, the insulation self-adhesive tape also has defects, although it is good waterproof performance but easy to break, so the final need to wrap two layers of plastic tape as a protective layer, the joint and the joint of the insulation self-adhesive tape is not sticky to each other, better performance.