According to my engineer training notes (for the GE):
"The control alternator meets all EEC power requirements when N2 increases above 11 percent. It continues to meet the requirements until N2 decreases below 9 percent. If one phase of either or both windings fails, the control alternator continues to meet all EEC power requirements if N2 is above 45%"
The values may appear different perhaps because of capacitors in the EEC's holding power on shutdown. Of course, on power up (fuel control in RUN), EEC power is being provided by ship power until the N2s rise.