MIL-DTL-16036M(SH)
e. Switchboard section mounting location, mounting plane and mounting orientation for the shock test shall
simulate the worst case shipboard installation as specified (see 6.2).
f. For each compartment of the switchboard section with ACB breakers installed, a minimum of one ACB
circuit breaker of each type shall be monitored for contact bounce during testing. Monitoring shall include all main
contacts and at least one normally open and one normally closed auxiliary contact.
g. For each compartment of the switchboard section with AQB breakers installed, a minimum of one AQB
circuit breaker of each type shall be monitored for contact bounce during testing. If one compartment contains the
same AQB circuit breaker type or types installed above and below the switchboard section center of gravity, a
minimum of two AQB circuit breakers of the same type (one located above and one located below the center of
gravity) shall be monitored for contact bounce during testing. Monitoring shall include all main contacts and, if
applicable, at least one normally open and one normally closed auxiliary contact.
h. To determine compliance with 3.5.14, switchgear components shall be subjected to electrical tests and
visual examinations to determine their ability to perform their principal function after the shock test using the
acceptance criteria specified in 4.4.3.3.1.
i.
Fans, when required, shall be energized during this test.
j. When lengths of ship s cabling are not practical to the test set-up, suitable dummy weights shall be included
in shock testing.
4.4.3.3.1 Principal function acceptance criteria. The following criteria shall be used to determine switchgear
component pass or failure acceptance criteria:
a.
Hair line cracks are permitted in the framework, but no separation of parts shall result.
b. Any resulting distortion shall not be of sufficient magnitude to impair the operation of the equipment
contained within or prevent the circuit breakers from being withdrawn.
c. The enclosure shall not distort to an extent which might result in contact with any electrically conducting
part within the section.
d. The bus work shall not be mechanically damaged nor the bus clearance distances reduced below the
minimum requirements.
e.
Insulation resistance shall not be reduced below that specified in 4.4.3.10.
f.
The section shall pass the dielectric strength test of 4.4.3.5 at 65 percent of the specified voltage.
g. Circuit breakers shall not change position/state from "on" to "off", from "off" to "on", or from "on" to
"trip" during the test. An "off" to "trip" position/state change is permitted.
h.
Any closing of circuit breaker main and auxiliary contacts from the open position shall not be acceptable.
i. Momentary opening of ACB Type circuit breaker main and auxiliary contacts shall not be in excess of
0.020 seconds during a single shock event.
j. Momentary opening of AQB Type circuit breaker main and auxiliary contacts shall not be in excess of
0.010 second during a single shock event. Multiple contact bounces are acceptable providing that the total elapsed
time from the beginning of the first bounce to the end of the last bounce does not exceed 0.015 seconds for auxiliary
contacts and 0.060 second for main contacts for a single shock event.
k.
Circuit breaker control relays shall not cause the circuit breakers to change position/state.
l.
For electronic circuit breakers, trip unit adjustable settings shall not change position.
m. All circuit breakers shall complete an open/close operation after each shock blow.
n. All circuit breakers with racking capability shall complete a racking cycle after each shock blow. Racking
shall be accomplished using the racking mechanism and standard racking tool without removal of circuit breaker
front cover.
o.
Bus and cable fasteners shall be verified to not have loosened.
4.4.3.3.2 Disposal of shock tested equipment. Equipment which has been subjected to high-impact shock may
be accepted as a production unit of the contract or order only if each of the following conditions are met:
a.
The vibration test is conducted after the completion of all shock tests.
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