Hand-held power tools can be divided into three categories according to the protection against electric shock　　 The electric shock protection of Ⅰ type tools not only relies on basic insulation, but also has an additiona...

Electric hand drill is a kind of electric tool that we often use in our lives. After a period of use, it needs to be maintained to eliminate faults and prolong its service life. Can you maintain the hand drill by yoursel...

1. Before using the tool, a full-time electrician should check whether the wiring is correct to prevent accidents caused by wrong connection of the neutral line and the phase line.2. Before using tools that have been lef...