MIL-PRF-21480B
3.4.2.9 Water intrusion and immersion. Unless otherwise required by the specification
sheet, operation during water immersion is not required. Generator system component design
shall include waterproof protection from exposure to rainwater intrusion, as required by the
specification sheet. Air inlet water ingestion requirements are specified in 3.4.2.3.
3.4.2.10 Chemical, biological, and radiological (CBR). When required by the specification
sheet, components shall withstand exposure to CBR and de-contamination agents.
3.4.2.11 Lightning, electromagnetic pulse, and directed energy weapons. When required by
the specification sheet, components shall withstand nuclear electromagnetic pulse effects,
directed energy weapon effects, and the indirect effects of lightning.
3.4.3 Operating position. Unless otherwise required by the specification sheet, the
generator shall withstand operation at all of the positions and time durations on figure 8. All
generator system components mounted remote to the generator package shall be capable of
operating in any position.
3.4.4 Explosive atmosphere. The generator package and connections shall not ignite any
surrounding explosive mixture when tested in accordance with 4.5.32. Seals and coatings
providing ignition hazard protection shall be undamaged by the tests in 4.5.
3.4.5 Configuration. Component weights, dimensions, and center of gravity, including
tolerances, shall be in accordance with the specification sheet. Limits for generator package
overhung moment shall be in accordance with the specification sheet. Provisions for electrical
interconnections between generator system components shall be in accordance with the
requirements of the specification sheet.
3.4.6 Consolidation of generator system components. Except for feeder fault protection
current transformers and generator control switch which must be remotely located, all other
protection, regulation, and control components shall be consolidated in the generator control unit
(GCU). Unless otherwise indicated by the specification sheet, the generator control unit shall be
consolidated into the generator package (see 6.8.9).
System control (see 4.5.16).
3.4.7
3.4.7.1 Manual system control. Manual system control of the AC power source shall be
provided by a two-position switch, or three-position switch, as required by the specification sheet
(see 6.8.2 for definitions of switch types I, II, and III). GCU control circuitry in conjunction with
switch operation shall function as specified herein. In the event of a protective function trip, the
system shall open the Generator Line Contactor (GLC) and remain tripped until manual reset
occurs. Manual reset shall occur when the control switch is held momentarily in the OFF-
RESET position and returned to the ON position. After manual reset the system shall
automatically reconnect the AC power source to the load bus within one second under the
following conditions: (1) all three phase voltages are within the range of 112.5 to 118.5 volts;
and (2) frequency is within prescribed limits for normal operation, as defined in 3.5.7.4.
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