When working on the ATF Advance Tactical Fighter F-22 we researched self shielding. So the number is 18 twists per foot. However the gauge does not have to get to be very small before the wire is too and stiff to twist. Shielding was very important to this stealth aircraft. My mentor researched wire impedance. The theory was developed and proven in the 1930 - 1940. What are the components of wire — cable impedance?
The transformative nature of designing and making things was the overarching, common theme at separate conferences held in Boston by two giants in the PLM space: Autodesk, with its Accelerate 2015, and Siemens’s Industry Analyst Conference 2015.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.