Quote: "Even 180 degree turns don't have that much inductance, beyond the length of the wire involved. You need to start getting towards 360 degrees before the inductance starts to rise. It's because inductance is all about magnetic field coupling, and the field from a wire doesn't couple well to a wire that's not parallel (why we put antennas at right angles to avoid interaction)."
Anyone who talks 180 degree turns while talking about lightning protection proves how little they know about lightning protection!
Same with the "Sharp bends" etc.
Real life lightning protection at high voltage and high power is different from "paper" calculations at low power levels.......
I've done a fair amount of work with high energy pulsed power and high voltage. While I can't say I've spent my entire professional career of 30 years doing it, I've probably broken, fused, vaporized, or blown up more copper and aluminum wire with high energy pulses than most of the people on this forum.
I've also got a decent background in physics and am familiar with most of the literature in the lightning effects and damage field including a wide variety of industrial and government specifications for lightning protection, which are NOT always entirely laws of physics based. As pointed out earlier, economic considerations come in to formulating recommendations: do you want to load 5 different kinds of cable on the truck or one? What's the relative price of labor and copper wire? What is easiest/fastest to connect to on a construction site? Are there government subsidies or taxes or regulatory compliance aspects?
I can substantiate all of my statements with experimental evidence and/or analysis. I would point you, again, to the work of E.B. Rosa at the NBS, who spent quite a while working out all the inductance formulas and then testing them against real life. I think you'll have to agree that the inductance formulas aren't going to have changed in the last 100 years.
If you want to provide advice that is contrary to what's in the code, you need to be able to provide a basis for that recommendation.