Extended data:
Power cord connectors are divided into "X" type connection, "I" type connection and "D" type connection. The joint shall be tightly wrapped, smooth and free of thorns. Before the thread end is disconnected, gently press it with wire cutters, then wrap it around your mouth and swing it left and right, and the thread end will be disconnected at the joint.
If the joint is in a dry place, first wrap two layers with insulating black cloth, then two layers with plastic tape (also called PVC tape), then two or three layers with J- 10 insulating self-adhesive tape, and finally two layers with plastic tape. Because direct use of plastic tape has many disadvantages: plastic tape is easy to be misplaced for a long time.
When the electrical load is large, the joint is hot, and the plastic electrical tape is easy to melt and shrink; The power connectors are pressed against each other in the junction box. When the connector has burrs, it is easy to puncture the plastic belt. These hidden dangers directly endanger personal safety, resulting in short circuit or abnormality of lines and fire.
The above situation will not occur when using insulating black tape. It has certain strength and flexibility, can be tightly wrapped around the joint for a long time, can be dried and solidified under the influence of time and temperature, will not fall off, and is flame retardant. Furthermore, wrapping with insulating black tape and then wrapping with tape can prevent moisture and rust.
However, the insulating self-adhesive tape also has defects. Although waterproof, it is easy to break. Therefore, it is necessary to wrap two layers of plastic tape as a protective layer, and the insulating self-adhesive tapes of the joint do not stick to each other, so the performance is better. Learn how to use electrical tape, use it correctly, prevent leakage and reduce harm.
References:
Baidu encyclopedia-electrician adhesive tape