As used in this chapter: “Covered equipment” means any mechanical equipment or hoisting equipment, any part of which is capable of vertical, lateral or swinging motion that could cause the equipment to be operated within ten feet of an overhead high voltage line, including but not limited to cranes, derricks, power shovels, drilling rigs, excavating equipment, hay loaders, hay stackers, combines, grain augers and mechanical cotton pickers. “Notice” means actual notification in the manner prescribed in § 59.1-411. “Overhead high voltage line” means all above ground bare or insulated electrical conductors of voltage in excess of 600 volts measured between conductors or measured between a conductor and the ground, except those conductors that are de-energized and grounded or that are enclosed in rigid metallic conduit or flexible armored conduit. “Person” means natural person, firm, business association, company, partnership, corporation or other legal entity. “Person responsible for the work” means the person performing or controlling the work. “Warning sign” means a weather-resistant sign of not less than five inches by seven inches with a yellow background and black lettering reading as follows: “WARNING — UNLAWFUL TO OPERATE THIS EQUIPMENT WITHIN 10 FEET OF OVERHEAD HIGH VOLTAGE LINES” or such other equally effective warning signs as may be approved for use by the Virginia Safety and Health Codes Board or the Commissioner of Labor and Industry. “Work” means the physical act of performing or preparing to perform any activity under, over, by, or near overhead high voltage lines, including, but not limited to, the operation, erection, handling, storage, or transportation of any tools, machinery, ladders, antennas, equipment, covered equipment, supplies, materials, or apparatus, or the moving of any house or other structure, whenever such activity is done by a person or entity in pursuit of his trade or business. “Working day” means every day except Saturdays, Sundays, and legal state and federal holidays.