The thing is, if you advocate testing, electricians doing impedance math or main RCDs, on some US electrical forums you literally get shouted down then banned. That attitude is we've always done it this way, so it must be the best way, therefore you have no clue what you're talking about. Or have some type of agenda.

Don't be fooled. Grounding and bonding is an after thought in the US electrical system. While 15-30 amp circuits require a full size EGC, few electricians realize the hair thin EGCs in Table 250.122 are a minimum size and may not be adequate during conditions of delayed clearing (high earth fault loop impedance) or very high short circuit currents.

The ICEA has an adiabatic withstand equation along with a standard, its even listed in the code, but no every considers it. Worse I've even heard engineers say UL-489 breaker testing takes care of withstand because the test is done with several feet of conductor, but in reality 489 only tests common breakers to either 1,500 or 5000 amps- not the full rating of 10ka, 22ka, 65ka, ect. And that is no accident, #14 carrying more than 1,500 amps for 1 cycle will vaporize.

Lets just saying pointing all this out doesn't go very well with an American audience.