Safety problem should be paid attention to when using hand-held electric tools---3

The appearance and electrical inspection shall be carried out before each use. The appearance inspection includes: whether the shell and handle are cracked and damaged, and whether the fasteners are complete and effective; Whether the flexible cable or wire is intact, whether the protective neutral (ground) is correct and firm, and whether the plug is intact; Whether the switch action is normal and flexible; Whether the electrical protection device and mechanical protection device are in good condition 'whether the rotating part of the tool is flexible and barrier free, and whether the clamp head is firm, etc. After power on, observe whether the spark and sound of the brush are normal.