A load bank is a device. It develops an electrical load, applies the load to an electrical power source and converts or dissipates the resultant power output of the source. The purpose of a load bank is to accurately mimic the operational or real load that a power source will see in actual application. However, unlike the real load, which is likely to be dispersed, unpredictable and random in value, a load bank provides a contained, organized and fully controllable load. Consequently, a load bank can be further defined as a self-contained, unitized, systematic device that includes load elements with control and accessory devices required for operation. Load banks are used in a variety of applications, including factory testing of engine diesel generator sets, To reduce wet stacking problems and Periodic exercising of stand-by engine generator sets.