MIL-PRF-83383E
TABLE V. Group B inspection.
Inspection
Requirement paragraph
Test paragraph
Dielectric withstanding voltage
Insulation resistance
Overload calibration 1/
Voltage drop
Endurance 2/
Vibration scan 3/
1/ Overload calibration shall be run at 200 percent and 1000 percent only at 25°C ±5°C. Each time this
test is run, a different axis shall be used.
2/ Endurance testing shall be run on a rotational basis, i.e., switch between ac and dc resistive, motor and
inductive loads.
3/ Upon completion of the vibration scan the device shall meet the 200 percent overload calibration
requirement when tested at 25°C, mounted in the y-axis, except that a +15 percent allowance will be
made on the trip time.
4.5.2.1.1 Sampling plan. One RCCB shall be selected after 100 units have been produced in a quarter. If
production exceeds 1000 units in a quarter, one RCCB shall be selected from each subsequent 1000 units. If no
RCCB's are selected in one year based on the above, two units will be selected at the end of that year. If these two
units represent more than 1 percent of production, testing is not required. The endurance and vibration scan testing
specified in table V shall only be carried out on the highest ampere rated device selected. The sampling plan as
specified, shall be based on the number of all devices which are similar.
4.5.2.1.2 Failure criteria. When one or more RCCB's fail to pass group B inspection, further acceptance shall be
withheld until the cause of failure is determined. In the event of a single isolated failure on group B testing, and if the
failed RCCB has satisfactorily completed 50 percent of the specified minimum cycles on the particular load being
tested, the manufacturer, at his option, may have two additional RCCB's selected for the same group B testing. If the
two RCCB's pass, the lot shall be accepted, and production and testing resumed. In the event of an additional failure
on the two samples, acceptance shall be withheld and corrective action will be necessary. After corrective action has
been taken, production and acceptance testing may be resumed. For production reasons, group A tests may be
continued pending the investigation of group B failure.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on the contract.
4.5.2.2 Group C inspection. Group C inspection shall consist of the inspections specified in table Vl, in the order
shown. Group C inspection shall be made on sample units selected from lots which have passed group A inspection.
4.5.2.2.1 Sampling plan. Fourteen sample units shall be selected from those covered by a single specification
sheet, 36 months after the date of notification of qualification, and after each subsequent 36 month period. The
sample units shall consist of one sample per current rating manufactured, except that for the highest current rating
manufactured, two samples shall be chosen. If all current ratings are not manufactured, tests which are scheduled for
these devices must be run on RCCB's which are manufactured, or on the highest current rated device if additional
units are needed to complete the tests. A test plan showing these exceptions must be submitted to the qualifying
activity prior to the start of testing. The endurance testing shall be run at the highest ampere rating being qualified.
The various types of endurance tests (resistive, inductive, motor and lamp loads) shall be covered on a rotating basis,
i.e., for each 3-year retention of qualification period, a different type of endurance test shall be performed. If there is
no production of RCCB's covered by a single specification sheet within a 36 month period, the
qualifying activity shall be notified, and the sample units for group C inspection shall be selected and tested from the
first inspection thereafter.
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