MIL-DTL-3950J
4.8.9 Dielectric withstanding voltage (see 3.6.8). Switches shall be tested in accordance with method
301 of MIL-STD-202. The following details and exceptions shall apply:
a. Special conditions: For qualification and group B inspections, switches shall be tested in
accordance with 4.8.9.1.
b. Test voltage: The magnitude of the applied test voltage shall be as specified in 4.8.9.1 and
c.
Duration of application of test voltage:
(1) Qualification and group B inspections: 1-minute, minimum.
(2) Group A inspection: 2 seconds to 5 seconds.
d. Points of application: The following points of application shall apply for each toggle lever position:
(1) Between current-carry parts and all noncommon exposed or grounded metal parts.
(2) Between current-carry parts of adjacent poles of multipole switches (not applicable after
electrical endurance tests).
(3) Between mutually insulated current-carry parts of the same pole (not applicable after
electrical endurance tests).
e. Monitoring: The circuit shall be monitored while the test voltage is at its specified magnitude, to
determine of the leakage current exceeds 500 microamperes.
f.
Examination after test - Switches shall be examined for arcing, flashover, breakdown of
insulation, or damage.
4.8.9.1 At atmospheric pressure. The applied test voltage shall be:
a. Qualification and group B inspections - 1,000 Vrms minimum except:
(1) Switches rated above 250 volts shall be subjected to a minimum voltage of 1,000 Vrms plus
200 percent of the maximum rated voltage.
(2) 750 Vrms, minimum, after electrical endurance tests.
b. Group A inspection - Test shall be conducted at room ambient conditions, and the potential shall
be conducted at room ambient conditions, and the potential shall be 1,200 Vrms, minimum,
except switches rated above 250 volts shall be subjected to a minimum voltage of 1,200 Vrms
plus 240 percent of the maximum rated voltage.
4.8.9.2 At reduced barometric pressure. The following details shall apply:
a. Method 105 of MIL-STD-202 at 65,000 ft.
b. The applied test voltage shall be 500 Vrms minimum except switches rated above 250 volts shall
be subjected to a minimum voltage of 500 Vrms plus 200 percent of the maximum rated voltage.
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