Thanks, i know this plugin, i've got the demo. It does what i need but once the twisted pairs generated there's no way to twist them around each other. There's a demo picture on their gallery that's very similar to what i'm looking for, a gallows rope, but i suspect the inner threads are pure texture not geometry.

Plus the thing i said earlier, insulation and inner copper thread must not be the same object, i need to texture them separately. Tricky stuff.