AC mains power is almost always transmitted at 50 or 60 Hz. Accepted reasoning is that lower frequencies make transformers larger and higher frequencies have greater transmission losses. Also lower frequencies caused noticable flickering in filament lamps.
My question is: what about arcing? Sure, DC is bad, but wouldn't low frequency AC like, say, 16 Hz railways be worse than 60 Hz? because of longer arc duration causing more damage ? What about 400 Hz aircraft? if the frequency is really high the arc might not have enough time to go out ? So, from a switchgear viewpoint, what frequency would be best?