An apprenticeable occupation is a skilled trade which possesses all of the following characteristics:
(1) It is customarily learned in a practical way through a structured, systematic program of on-the-job, supervised training.
(2) It is clearly identified and commonly recognized throughout an industry.
(3) It involves manual, mechanical, or technical skills and knowledge which, in accordance with the industry standards for the occupation, would require a minimum of 2,000 hours of on-the-job training, which hours are excluded from the time spent at related instruction.
(4) It requires related instruction to supplement on-the-job training. Such instruction may be given in a classroom, through occupational or industrial courses or correspondence courses of equivalent value, through electronic media, or through other forms of self-study approved by the department.