Texas Health and Safety Code - HEALTH & SAFETY § 752.002. Exemption for Certain Employees and Activities

(1) an employee of a light and power company, an electric cooperative, or a municipality working on his employer's electrical system;

(2) an employee of a transportation system working on the system's electrical circuits;

(3) an employee of a communication utility;

(4) an employee of a state, county, or municipal agency that has authorized circuit construction on the poles or structures that belong to an electric power company, an electric cooperative, a municipal or transportation system, or a communication system;

(5) an employee of an industrial plant who works on the plant's electrical system; or

(6) an employee of an electrical or communications contractor who is working under the contractor's supervision.