That's not a dumb question at all, in fact it makes a lot of sense to wonder about that. I don't know what the answer is, but have wondered about it the same as you.
Dumb Question about cables
Many cable manufacturers use heroic methods to shield from noise, EMI/RFI. The cables are large with all kinds of exotic insulation. But then they have long leads (from body of cable to the termination) with a thin layer of insulation. So what's the point of having the body of the cable so well insulated, but not the leads?
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