FED-STD-228A
Method 2181.1
18 APRIL 2014
OPENING, ARMOR
1. SCOPE
1.1 This method is intended for use in determining the resistance of armor of insulated wire and cable to
opening.
2. SPECIMEN
2.1 The specimen should be the armor from a piece of the inspection unit at least 44 inches in length.
The specimen should be prepared by removing the conductor from the cable without mechanical damage
to the armor.
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 specimen to be tested.
3.1.2 Weight as required in 4.1.
3.1.3 Vertical hoisting equipment.
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, specimens of armor from sizes AWG 18, 16,
and 14 stranded conductor cable and all sizes having armor of flattened cross section shall be tested with
a 150-pound weight and cables of all other sizes shall be tested with a 300-pound weight.
4.2 One clamp shall be fastened on each end of the specimen, leaving about 2 inches of the armor
projected beyond the clamps. The clamps shall be fastened firmly enough to hold the specimen but not
tight enough to damage the armor. One clamp shall be connected to the specified weight and the other
attached to a joisting apparatus. The unweighted end of the specimen shall be joisted 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 armor examined
visually for openings. Any openings in the specimen of sufficient size to expose any material under the
armor shall be recorded.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each inspection unit shall
be tested.
5.2 The opening of the armor of the inspection unit shall be the results obtained from the specimen
tested.
5.3 Any openings in the armor of sufficient size to expose any material under it shall be recorded.
5.4 The weight used shall be recorded.
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