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 MIL-HDBK-1023/4
Table A-8
Standby Engine Generators
Tolerance / limit
Operating 1/
Parameter
Standard
Initial
1. Starting time 1/
15 seconds or less
Same as standard
Same as standard
2. Potential relays
commercial power
a. 120 V system
3V
Dropout
108 V
Same as initial
3V
Pickup
114 V
Same as initial
b. 208 V system
3V
Dropout
191 V
Same as initial
3V
Pickup
197 V
Same as initial
c. 240 V system
Dropout
200 V
Same as initial
3V
Pickup
210 V
Same as initial
3V
d. 480 V system
-0, +5 V
Dropout
455 V
Same as initial
-0, +5 V
Pickup
465 V
Same as initial
3. Potential relay
engine power
a. Pickup voltage
3V
120 V
112 V
Same as initial
3V
208 V
197 V
Same as initial
3V
240 V
210 V
Same as initial
480 V
465 V
-0, +5 V
Same as initial
N/A
b. Dropout voltage
N/A
N/A
4. Pickup frequency
60 Hz
57-60 Hz
Same as initial
1/
For CAT-II operations, the engine generator is normally started and used for prime power. If
a generator failure occurs during this time, the CAT-II lighting load must be switched back to
commercial power within 1.1 seconds.
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