1) Add the moist charge and solvent to the furnace (unless the empty furnace is added to the top); 

2) found that the lining has serious damage and continues to smelt; 

3) violent mechanical impact on the intermediate frequency furnace lining; 

4) operate without cooling water;  

5) The metal solution or furnace structure is operated without being grounded; 

6) operate without normal electrical safety interlock protection;  

7) In the case of energization of the intermediate frequency furnace , charging, beating solid charge, sampling, adding a large number of alloys, measuring temperature, slag and the like. If it is necessary to carry out the above work under power-on conditions, appropriate safety measures should be taken, such as wearing insulated shoes or wearing asbestos gloves, and reducing the power. 

8) The chip material should be placed on the residual metal liquid after the liquid discharge as much as possible. The initial input amount is less than 1/10 of the capacity of the electric furnace, and it must be evenly input.  

9) Do not add tubular or hollow charge because the air expands rapidly and may cause an explosion.  

10) The pit must be free of water and moisture.