MIL-DTL-29183C
4.5.2 Operational tests.
4.5.2.1 Circuit breaker tests. Circuit breaker circuits shall be loaded to 100 percent of
their rated current loading for 1 hour. After being under this load for 1 hour, each circuit shall be
separately tested for overload response by imposing a load of 200 percent current rating of the
applicable breaker. All breaker poles shall be loaded equally. Each circuit breaker shall open
under the imposed load within the time limits established in UL 489. At the conclusion of the
tests, any evidence of abnormal circuit breaker operation or evidence of wire damage shall be
cause for rejection.
4.5.2.2 GFCI tests. Each GFCI type breaker will be tested for proper GFCI operation by
following the breaker manufacturer's recommended test procedure using the built-in test circuitry
of the GFCI breaker.
4.5.3 Dielectric strength test. The panel shall be tested for dielectric strength in
accordance with UL 67.
4.5.4 Environmental tests. The distribution panel shall operate satisfactorily under the
branch breaker loads and conditions specified in 4.5.4.1 through 4.5.4.7. Satisfactory operation
shall constitute no inadvertent breaker operation at rated current loads, component failures, or
evidence of impending failure.
4.5.4.1 Low temperature test. The low temperature test shall be conducted in accordance
with MIL-STD-810, method 502.4, procedure I at a minimum temperature of -25 °F (-32 °C) and
a duration, after panel stabilization, of 24 hours. The distribution panels shall operate
satisfactorily at the peak of the most severe level and after return to room ambient conditions at
the rated circuit breaker current loading.
4.5.4.2 High temperature test. The high temperature test shall be conducted in
accordance with MIL-STD-810, method 501.4, procedure II. The panel shall be maintained at a
stabilized temperature of 125 °F (52 °C) for a period of 48 hours. The distribution panel shall
operate satisfactorily during the high temperature exposure and after returning to room ambient at
rated current loading.
4.5.4.3 Rain test. The test unit shall be rain tested by the following procedure:
a. Place test unit in a test enclosure in the normal operating position.
b. Produce a simulated rainfall at a constant rate of 2 ± 0.5 inches per hour.
c. Rainfall shall cover a total arc of 90 degrees, 45 degrees on either side of vertical, for a
total time not less than one hour.
d. Rotate test unit 90 degrees about vertical axis from its position in step (a) and repeat
steps (b) and (c).
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