This part shall not be construed as applying to, shall not apply to, and is not intended to apply to, the construction, reconstruction, operation, and maintenance of overhead electrical conductors and their supporting structures and associated equipment by authorized and qualified electrical workers; nor to the authorized and qualified employees of any person, firm or corporation engaged in the construction, reconstruction, operation, and maintenance of overhead electrical circuits or conductors and their supporting structures and associated equipment of rail transportation systems, or electrical generating, transmission, distribution, and communication systems. This exception, when applied to railway systems, shall be construed as permitting operation of standard rail equipment that is normally used in the transportation of freight or passengers or both and the operation of relief trains, or other equipment in emergencies, or in maintenance of way service, at a distance of less than ten feet (10′), or the distance required by an applicable standard of the Tennessee occupational health administration, from any high-voltage overhead conductor of such railway system; but this part shall be construed as prohibiting normal repair or construction operations at a distance of less than ten feet (10′), or the distance required by an applicable standard of the Tennessee occupational health administration, from any high-voltage overhead conductor by other than properly qualified and authorized persons or employees under the direct supervision of an authorized person who is familiar with the hazards involved, unless there has been compliance with the safety provisions of §§ 50-3-1002 — 50-3-1005.