FED-STD-228A
5. RESULTS
5.1 Calculation.
5.2 The lay of twist of the cable at any place in terms of the diameter of finished individual conductors of
which it is composed shall be calculated as follows:
Lay of twist =
L (length of lay)
D (diameter of individual conductor)
where:
L=the distance, parallel to the axis of the cable, of one complete spiral of the conductor, inches.
D=the diameter over that same conductor, inches
5.2.2 The lay of twist of the cable at any place in terms of the pitch diameter of any layer of conductors of
which it is composed shall be calculated as follows:
Lay of twist = L2 (length of lay)
D1-D2 (pitch diameter)
where:
L1=the distance, parallel to the axis of the cable, of one complete spiral of the conductor, inches
D1=the diameter over the layer of conductors
D2=the diameter over a conductor of the same layer
5.3 Unless otherwise specified in the detail specification, two specimens, one from each end of the
inspection unit, shall be tested.
5.4 The lay of twist of the inspection unit shall be the average of the results obtained from the specimens
tested.
5.5 The lay of twist of the inspection unit shall be recorded to the nearest whole number.
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