Insulating tools are a type of electric tool that can be classified into categories I, II, and III based on their insulation structure. Class I tools refer to electric tools that use ordinary basic insulation. In terms of electric shock protection, not only basic insulation of ramie should be relied on, but also a safety precaution should be added, that is, the exposed conductive part that is not charged under normal circumstances but becomes a charged body when its basic insulation is damaged should be protected and connected to neutral. In order to be reliable, there should be no less than two points of protection for zero, and leakage protection should also be added. At the same time, operators are required to use insulation protection equipment. Class II tools refer to electric tools that use double insulation or reinforced insulation. In terms of electric shock protection, they not only rely on their basic insulation, but also have double insulation or reinforced insulation isolation measures for their normal live parts and accessible non live conductive parts. This is equivalent to designing and manufacturing the operator's personal insulation protection equipment on the tool in a reliable and effective manner. Class III tools refer to electric tools that use safe ultra-low voltage power supply and rely on safety isolation transformers for power supply in terms of electric shock protection