It also does not reflect all the people that think they can do better without ever looking at there local standard, or even having the basics of understanding to know what they don't know,
My own house was wired by a first year sparky apprentice prior to us buying it, who thought he knew better, and between the twisted and taped actives mine-field in the roof, no grounds run to any outlets, and every active and neutral reversed on the sockets,
While i am not trained, i can comfortably say something was wrong, found a neighbor who was a sparky, i ran all the wires with his supervision, he tested and terminated, and 2 weeks, and a few cases of beers later we could finally be confident in our mains wiring,