Employees are subject to working in inside and outside environments, extreme temperatures, and hazards in the work including exposures to loud noises, vibrations, proximity to moving mechanical parts, electrical current, working in high places, exposure to chemicals, fumes, odors, dusts, mists, gases, and oils. Follow a predetermined schedule of preventive maintenance on equipment and circuits to check for proper operation, loose connections, overheating, leaking, insulation, arcing, deterioration, cleanliness, vibration, alignment, and lubrication.