1, insulated black tape
Only insulation, but not flame retardant or waterproof, has been gradually eliminated, only in some civilian buildings are still used.

2, PVC electrical flame retardant tape
It has three functions of insulation, flame retardant, and waterproof, but because it is a PVC material, it is not malleable, it can not wrap the connector very tightly, and the waterproofing is not ideal, but it is now widely used.

3, high-pressure self-adhesive belt
It is generally used in higher grades of voltage. Because of its good ductility, it is better than the second type of waterproof water. Therefore, people also apply it to the field of low pressure, but because it is not as strong as the PVC electric flame retardant tape. Usually these two are used in conjunction.