Furthermore, if it is so, then the type of wire insulation and their spacing matters.
The type of wire is important, first for resistance and second for heat resistance. As you know if you take a copper wire which has many strands which are tinned individually, the resistance is lower than if not tinned. Copper conducts better than tin, so in a length of this wire the conduction is in the copper, and each strand is in parallel with the next, parallel resistances, therefore the overall resistance is very low. The insulation should withstand the heating up of the wire in the core, why! because these are shorted coils inside an alternating over wound solenoid current, like an induction heater, high currents will circulate within the shorted coils, they are a loop. A commercial unit has to be temperature controlled. The core capacitance is only around 600-800pF, not very much and depends on the size of the coils.
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