Knowledge of basic electronics to maintain various types of electrical, industrial and mechanical equipment (i.e. hand tools, air tools, etc.), various phases of maintenance work (i.e. plumbing, welding, heating and air conditioning, etc.) and understanding blueprints and schematics is necessary. A high school diploma or GED equivalent and 3 to 5 years of medium to heavy industrial maintenance (i.e. welding, plumbing, 480volt electrical systems, heating and air conditioning, repairing programmable controller and microprocessors, etc.) is required.