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
This is related primarily to the fact that when working with electricity, even the smallest mistake can cause severe short circuit, which would be harmful to human health.Usually created a power failure is unexpected and electrician seeking a solution to the problem moves groping. Therefore, for such a mistake it is very easy and you can tell that no theoretical knowledge is not able to prepare the employee to perfect the profession, because of some random events can not be predicted..