Series List
Safe operating rules for electric tools
1. The single-phase power cord of mobile electric machinery and hand-held power tools must use three-core soft rubber cables, and the three-phase power cord must use four-core rubber cables; Be fixed.



2. Before using electric tools, check the following items:

(1) The shell and handle are free of cracks and damage;

(2) The protective grounding wire or zero-connected wire is connected correctly and firmly;

(3) The cable or cord is intact;

(4) The plug is intact;

(5) The switch operates normally, flexibly and without defects;

(6) The electrical protection device is intact;

(7) The mechanical protection device is intact;

(8) The rotating part is flexible.



3. The insulation resistance of the power tool should be measured regularly with a 500V megohmmeter. If the insulation resistance between the live parts and the casing does not reach 2M, it must be repaired.



4. After the electrical part of the power tool is repaired, insulation resistance measurement and insulation withstand voltage test must be carried out. The test voltage is 380V and the test time is 1 minute.



5. The electrical circuit connecting the electric machinery and tools should be equipped with a switch or socket, and a leakage current action protector should be installed, and the metal shell should be grounded; it is strictly forbidden to connect multiple devices with one gate.



6. The rated leakage operating current of the current leakage protector shall not be greater than 30mA, and the operating time shall not be greater than 0.1 second; the rated leakage operating voltage of the voltage leakage protector shall not be greater than 36V.



7. The operation switch of the motor should be placed within the reach of the operator. When there is a sudden power failure during break, get off work or work, the power side switch should be cut off.



8. When using a portable or mobile power tool, you must wear insulated gloves or stand on an insulating pad; when moving the tool, you must not carry the wire or the rotating part of the tool.



9. When using Class III insulated power tools in a damp or acid-containing field and in a metal container, reliable insulation measures must be taken and a special person monitored. The switch of the power tool should be located within the reach of the guardian.



10. The disk surface of the magnetic chuck electric drill should be flat, clean and rust-free. When performing side drilling or back drilling, measures should be taken to prevent the drill body from falling after power failure.



11. When using an electric wrench, the counter-torque fulcrum should be firmly secured and the nut should be fastened before it can be started.
Next:Working principle of electric hammer and precautions for use


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