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Wikipedia about electricians in United Kingdom
Competency standards in the UK are defined by the Sector Skills council Summit Skills. Qualifications certificated by awarding organisations such as City and Guilds and EAL are based on these National Occupational Standards. Once qualified and demonstrating the required level of competence an Electrician can register with the JIB (Joint industry Board) for an Electrotechnical Certification Scheme (ECS) card. Electrical competence is required at Level 3 to practice as an electrician in the UK. The electrical industry is one of the few that require a trade test to be achieved prior to being fully qualified. This is known as the AM2.
Although many people think that minor electrical repairs do not require the employment of a specialist such as a qualified electrician, the majority of jobs decides to offer a permanent job for an electrician. Why is this happening? Well, according to the law serious fault electrical installations may only be carried out by specialists. It is a profession of high risk and therefore must have the expertise to carry it out. In the absence of skills and knowledge of repair system can lead to severe injury or even a real tragedy.
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.