Is there any symbol for electrical insulation?
Is there any symbol for electrical insulation?


As mentioned in other answers, the answer is no, or better, the whitespace indicate non connection. You can see, for example, the difference between the gate in JFET (or base in BJT) symbol and the insulated gate in MOSFET and IGBT symbol.



  Is there any symbol for insulated wire? is there any symbol for non-insulated wire?


The only thing I can see in Standard is the following symbol: