1.
electrician; electrical worker
A person who does electrical wiring and installation work. Also used as an abbreviation for electrical construction work or as part of company names in the electrical industry.
An abbreviation of 電気工事士 (electrical construction worker) or 電気工 (electrical worker). The word serves double duty: it refers to the person (electrician) and, as an abbreviation, to the trade or field of electrical work itself.
The formal license is called 電気工事士, with two levels: 第二種 (for residential/small-scale work) and 第一種 (for large-scale industrial/commercial work). In everyday speech, 電工 is the common shorthand for both the license and the profession.
The word also appears in major company names like 松下電工 (Matsushita Electric Works, now Panasonic).