FED-STD-228A
Method 2111.1
18 APRIL 2014
ELONGATION, ARMOR
1. SCOPE
1.1 This method is intended for use in determining the resistance to stretching of armor on insulated wire
and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 44 inches in length from which any
covering over the armor has been removed.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 Two clamps each 2 inches wide and of good fit on the cable to be tested.
3.1.2 Weight as required in 4.1.
3.1.3 Vertical hoisting equipment.
3.1.4 Steel scale or tape graduated to 1/32 inch or finer, or its decimal equivalent.
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, a weight of 100 pounds shall be used.
4.2 One clamp shall be fastened on each end of the specimen, leaving 2 inches of the cable projected
beyond the clamps. This leaves a distance of 36 inches of the specimen between the clamps. The
clamps shall be fastened firmly enough to prevent slipping but not tight enough to crush the armor.
4.3 One clamp shall be connected to the weight and the other attached to a hoisting apparatus. The
unweighted end of the specimen shall be hoisted gently until the weight on the other end hangs freely
without swaying. The specimen shall hang vertically and perpendicularly to the face of the clamps. The
specimen shall support the specified weight for one minute. The specimen and weight shall be lowered,
the clamps removed, and the specimen measured for recession of the conductors into the armor at each
end. The measurements shall be made to the nearest 1/32 inch and the sum of the recessions recorded.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each inspection unit shall
be tested.
5.2 The elongation of the armor at any place shall be the sum of the recessions of the conductor into the
armor at each end.
5.3 The elongation of the armor of the inspection unit shall be the result obtained from the specimen
tested.
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