FED-STD-228A
Method 2061.1
18 APRIL 2014
CRUSH RESISTANCE
1. SCOPE
1.1 This method is intended for use in determining the effect of crush resistance on wire and cable.
2. SPECIMEN
2.1 Two 18 inch specimens of the completed wire or cable shall be used for this test.
3. APPARATUS
3.1 The apparatus shall be as follows.
3.2 Shock test apparatus (see figure 1).
4. PROCEDURE
°
4.1 The specimens shall be freely suspended in an air oven at a temperature of +71 C ± 1°C for a period
of 72 hours. At the expiration of the 72 hour period, the specimens shall be removed from the oven and
allowed to remain at room temperature for 24 hours, after which they shall be subjected to the following
test.
4.1.1 The shock shall consist of dropping a 23±1 pound weight and free fall distance of 6.5±0.50 inch,
minus the outside diameter of the test sample on the center portion of the sample while it is clamped flat
on a smooth steel plate, free of abrasive contaminants as shown on figure 1. The drops shall be made at
the rate of 25±2 per minute. There shall be a continuous current of 100 milliamperes supplied to the
conductors under test with a current monitoring device to detect interior short circuit or failure with 1/3 or
½ of the conductors of a multi-conductor cable shall be permanently connected in serried with the
adjacent conductors connected into the load circuit.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, two 18 inch specimens of the completed wire or
cable shall be tested, one from each end of the inspection unit.
5.2 Any cracks, tears or distortions in the insulation on the internal and external surfaces shall be
recorded.
5.3 Discontinuities in current flow, short outs shall be recorded. Failure of a sample will be considered as
the time when current ceases to flow or when the specimen shorts out of grounds.
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