^^ They are all important. I have to say I have not studied the matter enough to know how they all weigh out. I do know though that its harder to build the cable to have good HF response and also keep it flexible, which is required by law (you can't use ROMEX in a power cord for example).
I have seen the conductors heat up too. So its pretty obvious that every part of the cable has to work correctly!
I have seen the conductors heat up too. So its pretty obvious that every part of the cable has to work correctly!