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The risk of a professional electrician

Occupation electrician is very often seen as a profession in which extremely common ones are physical injury.
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.

Different levels of electricians - Wikipedia

local electrician London
Electricians are trained to one of three levels: Apprentice, Journeyman, and Master Electrician. Apprentices in the US and Canada are working to learn the electrical trade.
They generally take several hundred hours of classroom instruction and are contracted to follow apprenticeship standards for a period of between three and six years, during which time they are paid as a percentage of the Journeyman's pay.

Journeymen are electricians who have completed their Apprenticeship and who have been found by the local, State, or National licensing body to be competent in the electrical trade.

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

Wikipedia about the job of linesman

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.

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local electrician London