MIL-DTL-24347B
TABLE I. First article, conformance and periodic inspection.
Inspection
First article
Conformance
Periodic
Requirement
Inspection
inspection
inspection
Inspection
General examination
X
X
X
3.26
4.4
Effectiveness of
enclosure
X
N/A
N/A
3.7
4.5.1
Creepage and
clearance
X
N/A
X
3.2
4.5.2
Insulation resistance
X
N/A
X
3.13
4.5.3
Wiring
X
N/A
X
3.4
4.5.4
Warm-up
X
N/A
X
3.19
4.5.5
Performance
X
X
X
3.4
4.5.6
Trip duty
X
N/A
X
3.6
4.5.6.1
Inclined operation
X
N/A
X
3.18
4.5.7
Interference
X
N/A
N/A
3.17
4.5.8
Reliability
X
N/A
N/A
3.20
4.5.9
Maintainability
X
N/A
N/A
3.21
4.5.10
Dielectric strength
X
X
X
3.14
4.5.11
Vibration
X
N/A
N/A
3.15
4.5.12
Voltage surge
X
N/A
X
3.4.2
4.5.13
Humidity
X
N/A
N/A
3.10.2
4.5.14
Shock
X
N/A
X
3.16
4.5.15
4.5.6 Performance. The monitor connection wiring diagram shown on figure 1A shall be used for this testing (see
3.4). The monitor tests shall be performed with each circuit breaker having a shunt trip and also a remote control
switch. The opening coils of the above disconnect devices shall have a resistance from 15 to 400 ohms. The single
phase monitor shall perform the functions specified herein when connected in either a single or three phase main
power circuit of either 115 or 440 normal voltage and either a 60 or 400 Hz normal frequency. The monitor shall
operate satisfactorily within the specified limits when the voltage is reduced to 85 percent of normal or raised to 10
percent above normal. The operating frequency range shall be plus or minus 5 percent of normal. The monitor shall
perform satisfactorily when two cables are connected in parallel to form one leg of the load circuit and the current
sensing transformer is placed around one cable only which has an available current of 1-1/2 amperes (plus or minus
15 percent) or more. Under the above conditions the monitor shall permit the load disconnect device to close and
stay latched if a load of 1-1/2 amperes (plus or minus 15 percent) or more exists. When the above load is removed,
the monitor shall actuate its normally open static contact to a closed position and cause the load disconnect device to
open. The static normally open contact in the monitor shall have a minimum 10-ampere continuous current carrying
rating. The tests shall be performed over an ambient temperature range as specified in 3.10.1. The same monitor is
then in accordance with connection wiring diagram 1B, testing shall be repeated to demonstrate the ALM output is
capable to open the 250 ampere Navy Standard AQB type breakers via the motor operator under the same test
condition.
4.5.6.1 Performance latch and trip. During the testing of 4.5.6, it shall be demonstrated that the monitor has
latched and tripped the associated disconnect device or open the circuit breaker via motor operator for at least 40
cycles of operation (see 3.6).
4.5.6.2 Reset. During the performance test, the available current shall be increased to 1-1/2 amperes. The
current shall then be reduced to less than 1-1/2 amperes before the delay time is reached and the monitor sends a
trip signal. The monitor shall reset.
4.5.7 Inclined operation. The monitor shall be tested for inclined operation at rated voltage and frequency.
Inclination of the monitor in the following positions shall not affect the performance requirements of 3.4 and 3.18:
a. Inclined 45 degrees forward.
b. Inclined 45 degrees backward.
c. Inclined 45 degrees to the right side.
d. Inclined 45 degrees to the left side.
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