Paralleling and regulation of 24–28-volt D-C generators in multiengine aircraft

MOST large United States Army Air Forces aircraft of the present day employ the type of electric system that is outlined by the Army Air Forces specification 32300, “Installation of Electrical Equipment, General Specification for.” This is a 24–28-volt d-c single-wire grounded negative system in which the nominal rating of the batteries is 24 volts and the engine-driven generators deliver power at 28 volts. All power is fed into and taken from a common bus which interconnects all wiring of the airplane as shown in Figure 1.