(1) "Authorized person" means:

(A) Employees of an electrical utility company with respect to the electrical system of such a company, and the employees of a transportation system with respect to the electrical circuits of the system;

(B) Employees of communication utilities, state, county, or municipal agencies having authorized circuit construction on the poles or structures of an electric utility company, transportation system, or communication system;

(C) Employees of an industrial plant with respect to the electrical system of the plant;

(D) Employees of a municipality with respect to the electrical system of the municipality; and

(E) Employees of any electrical or communications contractor with respect to work under his or her supervision, having authorized construction work on the poles or structures of an electrical utility company, transportation system, or communication system;

(2) "De-energizing" means removing the voltage from electrical conductors and grounding;

(3) "Energized overhead electrical lines" means electrical lines which are energized at a potential of four hundred forty (440) volts or more, as measured between the conductor and the ground;

(4) "Mechanical barrier" means a temporary device for separating and preventing contact between material or equipment and energized overhead electrical lines such as:

(A) Insulating barriers; or

(B) Nonconductive enclosures around conductors;

(5) "Shall" is to be understood as mandatory;

(6) "Should" is to be understood as advisory;

(7) "Temporary relocation" means:

(A) Removing electrical conductors from poles;

(B) Elevating electrical conductors; or

(C) Rerouting electrical conductors;

(8) "Warning sign" means a weather-resistant sign of not less than five inches by seven inches (5" x 7") with a yellow background and black lettering reading as follows: