MIL-PRF-22885H
4.7.19 Dielectric withstanding voltage (see 3.24). Switches shall be tested in accordance with 4.7.19.1 and, when
applicable, in accordance with 4.7.19.2.
4.7.19.1 At atmospheric pressure. Switches shall be tested in accordance with method 301 of MIL-STD-202.
These tests shall be performed with the switch contacts in normal position, and shall then be repeated for each other
contact operating position. The following details shall apply:
a.
Test potential: 1,000 volts rms.
b.
Duration of application: One minute for qualification and group B tests; 5 seconds for group A tests.
c.
Points of application:
(1)
Between each terminal and exposed noncurrent carrying metal or grounded parts.
(2)
Between adjacent terminals of mutually insulated circuits.
(3)
Between all unconnected contact terminals of the same pole. This measurement is not applicable
after electrical endurance.
d.
Examination after test: Switches shall be examined for evidence of arcing, flashover, breakdown of
insulation, and damage.
4.7.19.2 At reduced barometric pressure. Switches rated for operation above 10,000 feet shall be tested as
specified in 4.7.19.1 and in accordance with method 105 of MIL-STD-202. The following details and exceptions shall
apply:
a.
Test voltage: Unless otherwise specified, 400 volts rms.
b.
Test condition: Unless otherwise specified, C.
4.7.20 Seal (when applicable) (see 3.1 and 3.25). Switches shall be tested as specified in 4.7.20.1, 4.7.20.2, or
4.7.20.3. If switches incorporate an edge-lit panel mounting spacer, one-half of the sample units shall be mounted
with the spacer in front of the panel. The remaining half shall be mounted with the spacer behind the panel or without
the spacer, as applicable. Following the test, switches shall be examined for water leakage and subjected to the
dielectric withstanding voltage test. Unless otherwise specified (see 3.1), group A seal inspection shall consist only of
examination of the seals for pinholes and other defects using lighted 3 diopter inspection equipment.
4.7.20.1 Splashproof (applicable to enclosure design 4) (see 3.25). With the switch mounted by its normal means,
the switch shall be subjected to the splashproof test of MIL-STD-108.
4.7.20.2 Watertight (applicable to enclosure design 3) (see 3.25). Switches shall be properly mounted with the
specified mounting hardware in the bottom of an open container. The switches shall be subjected to the watertight
test of MIL-STD-108. While submerged, the switches shall be manually operated for three complete cycles of
operation.
4.7.20.3 Dripproof test (applicable to enclosure design 2) (see 3.25). With the switch mounted by its normal
means, the switch shall be subjected to the dripproof test of MIL-STD-108, 15 degrees method, with a 5 gallon
quantity of water flowing over the specimen for a period of 5 minutes duration. The water shall be directed within 12
inches above the test specimen.
4.7.21 Marking visibility (see 3.26). Switches shall be examined for legibility of required marking.
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