So, I gather that the IG system works best when the ground is brought back to the service, is never of any use in residential applications, and could be totally eliminated by simply re-designing the electronics used, but this would be costly to the electronics manufacturer. They would much rather have the electrician eat the costs by fixing the designer's omission with elaborate IG specs.
I've often thought that electronic gadgets need to be housed in magnetically isolated metal cases (like the old anti-magnetic watch) and fed by DC batteries (i.e. the laptop). Such a plan would eliminate any stray high frequency current from being confused with valid input.
Harmonics could be eliminated as well by proper design of the harmonics producing devices. Wave chopping is cheap, but why not use the entire sine wave? The cheapest way is not the best way.
