(1) “Approved” means approved by the commissioner;
(2) “Commissioner” means the commissioner of labor and workforce development or any of the commissioner's authorized representatives;
(3) “Department” means the department of labor and workforce development;
(4) “High-voltage” means a voltage in excess of seven hundred fifty (750) volts between conductors or from any conductor to ground; and
(5) “Overhead lines” means all bare or insulated electrical conductors installed above ground, except those conductors that are enclosed in approved metal covering.