Tenn. Code Ann. § 68-122-206: Exclusions.

(a) This part shall not apply to persons, corporations, partnerships or firms that are complying with the rules and regulations of the interstate commerce commission or to persons, corporations, partnerships or firms that have their own maintenance personnel who are limited to the lawful erection and repair of their own boiler equipment.

(b) This part shall not apply to those persons, corporations, partnerships or firms engaged in the work of repairing or erecting those types of steam boilers specifically excluded by § 68-122-105.