FED-STD-228A
where:
D1=diameter (average of two measurements 90° apart) of first wire in the conductor, in mils
D2=diameter (average of two measurements 90° apart) of second wire in the conductor, in mils
Dn=diameter (average of two measurements 90° apart) of nth wire in the conductor, in mils
n=the number of wires in the conductor
Size of stranded conductor, circular mils = S1+S2+- - - - - - +Sn
where:
S1 = circular mil size of first wire in conductor (5.1.1)
S2 = circular mil size of second wire (5.1.1)
th
Sn = circular mil size of N wire (5.1.1)
n = the number of wires in the conductor
5.2 Unless otherwise specified in the detail specification, two specimens from each inspection unit shall
be tested.
5.3 The size of the conductor of the inspection unit shall be the average of the results obtained from the
specimens tested.
5.4 The diameter of the conductor of the inspection unit shall be recorded to the nearest 0.1 mil or
0.0001 inch.
5.5 The cross-sectional area of the conductor of the inspection unit shall be recorded to the nearest
circular mil.
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