MIL-PRF-22885H
MIL-STD-202 with associated mounting and terminal hardware assembled. The following details and exceptions
shall apply:
a.
Test condition: A.
b.
Post test: Switches shall be examined for evidence of warping, cracking, excessive corrosion, or other
damage.
4.7.23 Insulation resistance (see 3.28). Switches shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
a.
Test condition: B.
b.
Points of measurement:
(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.
These tests shall be performed with the switch in normal position, and shall then be repeated for other operating
positions.
4.7.24 Short circuit (see 3.1 and 3.29). Switches shall be tested as specified in 4.7.24.1, method I, or when
4.7.24.1 Method I. The switch shall be inserted in a circuit calibrated to supply current equal to 60 times the rated
resistive load at the lowest rated dc voltage specified (see 3.1). The switch shall be connected in series to a
thermal-type circuit breaker or a fuse in accordance with figure 5. A circuit breaker shall be used for switches having
a rated resistive load of 10 amperes or greater, and a fuse for switches having a rated resistive load less than 10
amperes. The wire shall be of a size for single use in free air as specified in table XIV as determined by the rated
resistive load of the switch (see 3.1). If the rated load of the switch does not coincide with a wire size, the next larger
wire size shall be used. The terminals shall be in accordance with SAE-AS7928. The circuit breaker shall be in
accordance with SAE-AS58091 and cable and fuses shall be in accordance with MIL-PRF-15160 and table XIV. If
the rated load of the switch does not coincide with a circuit breaker or fuse current rating, the next larger breaker or
fuse shall be employed. Calibration shall be made with a substitute circuit breaker (or equivalent fuse), less the test
switch and with the switch leads in the circuit. With both the switch under test and the circuit breaker in a closed
position as shown on figure 5, the circuit shall be closed manually by switch S1. A minimum of 2 minutes shall elapse
between the successive closings of the switch. The test shall be conducted five times. For double-throw switches,
half the switches shall be tested in one position, and the remaining half shall be tested in the other position.
4.7.24.2 Method II. Method II is similar to method I except as follows: The calibrated circuit shall be closed by the
switch under test, and after the circuit breaker or fuse interrupts the circuit, the test switch shall be manually opened.
This procedure shall be repeated ten times. After each closure, the test switch shall be returned to the "off" position,
and the switch contacts shall be checked for proper opening by any suitable continuity test method. The circuit
breaker shall be reset or the fuse replaced after each closure. The switch contacts under test must open after each
closure operation, and there shall be no mechanical failure or damage to the switch case.
4.7.25 Explosion (see 3.30). Switches shall be tested in accordance with method 109 of MIL-STD-202. The
following detail shall apply:
a.
Electrical load: Switches shall be operated at their rated inductive current and at their maximum rated dc
voltage.
b.
The switches, including the lamp circuits, shall be checked for electrical and mechanical operation at the
conclusion of the test.
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