FED-STD-228A
4.2 The specimen shall be suspended vertically with lower end weighted sufficiently to keep specimen
taut and to permit bending without handling. The specimen shall be attached to the mandrel of the size
computed in accordance with table I. The specimen and mandrel shall be placed in the cold chamber
and subjected to the required temperature for the required period of time. At the end of the exposure
period and while still in the cold chamber, the specimen shall be bent for six close turns around the
mandrel for cable outside diameter of 0.750 inch or less, or 180° bend for cable outside diameter of 0.751
inch or greater, at the rate specified in the detail specification or specification sheet. The specimen shall
be examined for cracks.
4.3 Flat twin wire or cable shall be bent on the minor axis of its cross section.
TABLE I. Computed mandrel sizes
Mandrel size, maximum
Nom. outside diameter of
Individual insulated
insulated conductor of cable
Unshielded cable Shielded cable
conductors
Up to 0.300
1.0 X OD
3.0 X OD
1.5 X OD
.301 to .350
2.0 X OD
3.0 X OD
2.0 X OD
.351 to .450
2.5 X OD
3.0 X OD
2.5 X OD
.451 to .550
3.0 X OD
3.0 X OD
3.0 X OD
.551 to .750
4.0 X OD
4.0 X OD
.751 to .950
5.0 X OD
5.0 X OD
.951 to 1.050
6.0 X OD
6.0 X OD
1.051 to 1.150
7.0 X OD
7.0 X OD
1.151 to 1.250
8.0 X OD
8.0 X OD
Over 1.251
10.0 X OD
10.0 X OD
5. RESULTS
5.1 Unless otherwise specified in the detail specification or specification sheet, one specimen from each
inspection unit shall be tested.
5.2 Any cracks in the insulation or jacket of the specimen shall be recorded.
5.3 The flexibility of the insulation or jacket of the inspection unit shall be the results obtained from the
specimen or specimens tested.
5.4 The temperature and time of exposure.
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