MIL-DTL-16036M(SH)
4.4.3.6.1 Waterspray test. When the contractor has developed a design for making switchgear enclosures
spraytight, the waterspray test shall be conducted on one representative unit of this construction. If the methods
employed by the contractor to achieve spraytight construction in a design are modified, a retest shall be conducted to
reestablish that the spraytight requirements are met. Switchgear shall be subjected to the waterspray test
requirements of MIL-STD-108 for spraytight enclosure with the following exceptions (see 3.17):
a. Direct a stream of fresh water against the enclosure at representative covers, handles, seams, plates, and so
forth. The stream of water shall be directed at the front, back, sides, and top of the enclosure for not less than 15
minutes on each of the above surfaces. At a 90-degree position to each of the above enclosure surfaces, the water
nozzle shall be slowly rotated in an arc from 45 degrees right to 45 degrees left, and 45 degrees up to 45 degrees
down from the perpendicular axis. If, under the above spray test procedure on the front and rear surfaces of the
enclosure, the stream of water cannot strike the intakes to the lowest ventilation louvers or openings when the nozzle
is positioned at 45 degrees below the perpendicular axis, then the entire enclosure shall be first tilted 30 degrees
from the top toward the rear, and then 30 degrees from the rear toward the front and the above spray test procedure
performed on these two surfaces.
b. Insulation resistance test shall be conducted on the complete switchboard within 30 minutes after the
completion of the test at the voltage specified in 3.25.
4.4.3.6.1.1 Pass/fail criteria. Insulation resistance readings of less than 10 megohms shall constitute a failure.
4.4.3.6.2 Watermist (when specified). When the contractor has developed a design for making switchgear
enclosures water mist resistant, the water mist test shall be conducted on one representative unit of this construction.
If the methods employed by the contractor to achieve water mist construction in a design are modified, a retest shall
be conducted to reestablish that the water mist requirements are met. Switchgear shall be subjected to the blowing
rain test requirements of MIL-STD-810, Method 506.5, Procedure II. The pressure, flow rate, droplet size range,
and duration of the test shall be as specified (see 6.2). Fans shall not be running when the water mist event occurs.
Insulation resistance test shall be conducted on the complete switchboard within 30 minutes after the completion of
the test at the voltage specified in 3.25.
4.4.3.6.2.1 Pass/fail criteria. Insulation resistance readings of less than 10 megohms shall constitute a failure.
4.4.3.6.3 Temperature rise tests for switchboards.
4.4.3.6.3.1 Switchboard sample(s). The test shall be conducted on a complete switchboard section for each
sample or samples chosen. All equipment (including spare circuit breakers), cabling, and bus work shall be installed
in accordance with the shipboard installation. All circuit breakers (except spares) and all disconnects shall be fully
cabled including those that are not used as a load during testing.
4.4.3.6.3.2 Test chamber. Testing shall be conducted without recirculation of air into the test chamber. Fans
may be used to maintain ambient temperature and to prevent air stratification within the test chamber. These fans
shall be directed away from the switchboard towards the sides of the test chamber enclosure. Air from these fans
shall not blow directly onto or be deflected onto any part of the switchboard section during testing.
4.4.3.6.3.3 Sensors and sensor locations. Temperature sensors (thermocouples or other approved methods)
shall be installed to determine ambient temperature within the test chamber (but outside the switchboard section) and
temperature rise in each compartment of the switchboard section.
4.4.3.6.3.3.1 Ambient temperature sensors. Six sensors shall be installed in one of the following
configurations:
a. Three sensors shall be installed 3 feet away from both the left and right sides of the switchboard section at
half the depth and at the following locations:
(1) One sensor shall be 6 inches from the bottom of the switchboard section.
(2) One sensor shall be 6 inches from the top of the switchboard section.
(3) One sensor shall be at half the height of the switchboard section.
b. Three sensors shall be installed 3 feet away from both the front and back surfaces of the switchboard
section at half the section width and at the following locations:
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