Training and Regulation of Trade
Most jurisdictions require qualifications to do work on any electrical apparatus with voltages above a specified electric potential to ground. This is normally anywhere from 24 to 100 volts depending on the governing body. Many companies have their own voltage limit rules as well.
In most countries, the job of an electrician is a regulated trade for safety reasons due to the many hazards of working with electricity, requiring testing, registration, or licensing. Licensing of electricians is controlled through government or professional societies.
Read more about this topic: Electrician
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“Until the end of the Middle Ages, and in many cases afterwards too, in order to obtain initiation in a trade of any sort whatever—whether that of courtier, soldier, administrator, merchant or workman—a boy did not amass the knowledge necessary to ply that trade before entering it, but threw himself into it; he then acquired the necessary knowledge.”
—Philippe Ariés (20th century)