1, when using power electricity, first check whether the power switch, motor and equipment parts are in good condition. If there is any fault, it should be eliminated before turning on the power supply. When using electronic instruments and equipment, we must first understand their performance and operate according to the operating procedures. If the electrical equipment is overheated or burned, we should cut off the power supply immediately.

2. When the fuse of power supply or electrical equipment is blown, first find out the cause of the fuse. After troubleshooting, the appropriate fuse should be replaced according to the original load, and it is not allowed to add or replace it with other metal wires at will.

3, special electric furnace or motor, etc. , should be grounded as required to prevent electric shock accidents.

4, pay attention to keep the wires and electrical equipment dry, to prevent the lines and equipment be affected with damp and leakage.

5, there should be no bare wire head in the laboratory; Articles are not allowed to be stacked in the power switch box.

6. Be alert to the emergence of electric sparks or static electricity in the laboratory, especially when explosive and combustible gases are used. When the wire is on fire, cut off the power supply and put out the fire with sand or carbon dioxide fire extinguisher.

7. Do not change or repair electrical equipment without authorization. When using high-voltage power electricity, you should wear insulating rubber shoes and gloves, or operate with safety rods.

8. Connect the circuit before turning on the power. At the end of the experiment, cut off the power supply first and then disconnect the circuit.