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In military aircraft, the growth of electric power consumption has been very large. The load requirements have led to the desirability of developing a-c systems rather than producing power as direct current and then converting to meet the a-c load requirements. For the most part, single-generator systems or combinations of single-generator systems using split-bus arrangements have been used. Need for higher-reliability systems, having greater reserve capacity, and making higher utilization of generator capacity through the diversification of load equipment leads to the conclusion that parallel systems should be used in future aircraft.