1) Before the tool is powered on, it is necessary to check that the switch is in the off state before it can be inserted.

2) Confirm whether the power supply connected to the site is consistent with the voltage required by the electric wrench, and whether the leakage protector is connected.

3) Select the matching sleeve according to the size of nut and install it properly.

4) Too high or too low voltage should not be used.

5) Do not use the simplified as a hammer tool.

6) Do not add the sleeve bar or crowbar to the handle to increase the force.

7) The metal shell of the electric wrench needs reliable grounding.

8) Check the fastening condition of the mounting screws on the body of the electric wrench. If the screws are loose, they need to be re tightened immediately.

9) Check whether the handles on both sides of the hand-held electric wrench are in good condition and installed firmly.

10) Measures shall be taken to prevent falling when working on ladders or working at heights.

11) If the work place is far away from the power supply and the cable needs to be extended, the extension cable with enough capacity and qualified installation shall be used.