e57
I will post the same response as I did on the Mike Holt site.
I don't think the RG-6 impedance would make any noticable at all at with that amount of energy.
Have you ever looked at the short cicuit calculations to see how much the current is reduced by the impedance of the conductor? Using the short circuit calculator on the Bussmann site, if you start with 10,000 amps available short circuit current and run 50' of #14 in a non magnetic raceway, you only have 452 amps available line to neutral at the end of the run. Even if I take the available current up to 50,000 amps at the start of the run, the line to neutral available current at the end is only 464 amps. The impedance of the coax will be much much higher than than of #14 copper and reduce the available current even move. Note I used single conductors in non-magnetic conduit because that is the closest match for NM that they have on the calculator.
Don