Electricians are trained to one of three levels: Apprentice, Journeyman, and Master Electrician.
Master Electricians have performed well in the trade for a period of time, often seven to ten years, and have passed an exam to demonstrate superior knowledge of the National Electrical Code, or NEC.Źródło: https://en.wikipedia.org/wiki/Electrician
A lineman (American English) or linesman (British English), also occasionally called a lineworker, powerline technician (PLT), or a powerline worker, is a tradesman who constructs and maintains electric power transmission and distribution facilities.The term is also used for those who install and maintain telephone, telegraph, cable TV and more recent fiber optic lines. The term refers to those who work in generally outdoor installation and maintenance jobs.Those who install and maintain electrical wiring inside buildings are electricians.Źródło: https://en.wikipedia.org/wiki/Lineman_%28technician%29
Excellent insulation of cables and their arrangement can make the most electrical work will be the installation of such electrical lines, not during their operation.
Does this mean that in the future, avoid any electrical failures? The answer to this question is simple and of course negative, because although more and better solutions are continuously implemented many failures simply impossible to predict, even using the most modern electrical installations..