There are many hazardous locations within the industry. Wastewater pump stations and sewerage treatment plants have many areas where explosive gasses accumulate. Special wiring systems need to be installed to ensure the area is free of explosion hazards. Explosions can be caused by electrical equipment. There is a special knowledge required to ensure that the proper classification of electrical equipment and wiring methods are installed. A proper installation will ensure the safe operation of electrical equipment within an explosive atmosphere. Many times electrical installations are overdesigned or misclassified. Tens of thousands of dollars are spent on installations where a fraction of the cost is actually required. It is important to know area classifications and boundaries of classified areas so installations are cost effective.