MIL-PRF-15160K
TABLE VIII. Group C inspection.
Test
Requirement
Test method
Group I (four samples) 1/
Short circuit interrupt
Group II (four samples) 2/ 3/
Continuity
Vibration
Shock
Group III (four samples) 2/
Low voltage overload interrupt
Group IV (five samples) 2/
Moisture resistance (labels)
1/ The short circuit interrupt test may be waived provided sufficient evidence can be
provided, to the qualifying activity, that these fuses have passed the UL short circuit.
2/ When applicable (see 3.1).
3/ For group C inspection, shock and vibration may be performed on only the maximum
current rating for each characteristic.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group C inspection shall not be
delivered on the contract or order.
4.5.2.1.4 Nonconformance. If a sample fails group C inspection, the contractor shall immediately notify the
qualifying activity and cognizant inspection activity of such failure and shall take warranted corrective action on the
materials, processes, or both, and on all correctable product units manufactured under similar conditions, with similar
materials, processes, and so forth, and subject to similar failure. Shipment and product acceptance shall be
discontinued until corrective action, acceptable to the qualifying activity, has been taken. Subsequently, group C
inspection shall be repeated on additional sample units (either all inspections or the failed original sample inspection
at Government discretion). Group A and group B inspection may be re-instated; however, final acceptance shall be
withheld until group C re-inspection reveals successful corrective action. In the event of failure after re-inspection,
failure and relevant corrective action information shall be furnished to the cognizant inspection and qualifying
activities.
4.6 Visual and mechanical examination. Fuses shall be examined to verify that the materials, interface, physical
dimensions, markings, and workmanship are in accordance with the requirements specified in 3.1 through 3.5
4.7 Test methods.
4.7.1 Continuity. Continuity of each fuse shall be determined. The equipment used shall limit the current and not
cause the fuse to interrupt. (Caution: Insulation testers may provide excessive current on low amperage fuses and
cause inadvertent interruption.) Fuses shall meet the requirements specified in 3.6.
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