Chemical Cleaning of Blackened Copper Wires.

When working with higher frequencies the skin effect tends to drive the current to the outer of the conductor, so the current carrying capaciity is reduced from the DC value.

One way to beat this, without going to the aggro of flat palm braids or ribbons,  is to make a cable that is deliberately formed of many insulated strands, and then in the really expensive stuff with the very lowest losses, to plait the cores in a special way that they take it in turns to be inside or outside the bundle all equally balanced .

Litzendraht or Litz Wire  to give it the proper name used to be common in the days of long wave radio, before electronics made amplification cheaper then fancy wire.

  Now mostly seen in induction hobs to make very compact low loss coils.

Traditionally cotton weave, nowadays a self bonding varnish, so once the wire is wound on a former it is heated until the varnish sticks the strands together, and then the former can be removed leaving a self supporting coil.

So, insulated strands do you no harm, but yes, at the ends, you do need to be sure the strands are all connected- the sort of job where 3 of the 7 strands go under the screw and the rest flap about will not do.

When working with higher frequencies the skin effect tends to drive the current to the outer of the conductor, so the current carrying capaciity is reduced from the DC value.

One way to beat this, without going to the aggro of flat palm braids or ribbons,  is to make a cable that is deliberately formed of many insulated strands, and then in the really expensive stuff with the very lowest losses, to plait the cores in a special way that they take it in turns to be inside or outside the bundle all equally balanced .

Litzendraht or Litz Wire  to give it the proper name used to be common in the days of long wave radio, before electronics made amplification cheaper then fancy wire.

  Now mostly seen in induction hobs to make very compact low loss coils.

Traditionally cotton weave, nowadays a self bonding varnish, so once the wire is wound on a former it is heated until the varnish sticks the strands together, and then the former can be removed leaving a self supporting coil.

So, insulated strands do you no harm, but yes, at the ends, you do need to be sure the strands are all connected- the sort of job where 3 of the 7 strands go under the screw and the rest flap about will not do.