MIL-DTL-24643C
4.4.6 Group C inspections. Group C inspections as required by the specification sheet shall be performed on
specimens taken from samples selected in accordance with 4.4.3.3.
4.4.7 Group D inspections. Group D inspections as required by the specification sheet shall be performed on
specimens taken from samples selected in accordance with 4.4.3.4.
4.5 Certified test reports. The contractor shall prepare test reports as specified (see 6.2.1 and 6.2.2).
4.6 Test conditions. Unless otherwise specified (see 3.1), the inspections specified in tables VI and VIII shall
be made at standard ambient conditions as follows:
a.
Temperature: 23±2 °C
b.
Humidity: 50±40 percent RH
4.7 Visual and dimensional inspection. Cables shall be visually inspected to verify that the materials, design,
construction, physical dimensions, marking, and workmanship are as specified in 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, and the
specifications sheets. Concentricity, wall thickness, and dimensional inspections shall be made as specified in 4.7.1
and 4.7.2.
4.7.1 Concentricity and wall thickness. The concentricity of the finished wire and the finished cable jacket
shall be determined in accordance with 4.7.1.1, as applicable. Wall thickness measurements shall be made on cross-
sections of the finished wire or cable jacket under suitable magnification. The wall thickness shall be the shortest
distance between the outer rim of the finished wire insulation or cable jacket and the outer rim of the underlying
conductor or shield strand.
4.7.1.1 Component wire and cable jacket. The concentricity of the finished wire and cable jacket shall be
determined by first locating and recording the minimum wall thickness measured on a cross-section of the finished
wire and cable jacket. From this point on the outer rim of the finished wire and cable jacket (at which the minimum
wall thickness was measured), three more reference points (90 degrees apart) on the outside rim of the finished wire
and cable jacket shall be established. At each of these three reference points, the nearest member of the conductor
shall be selected, and the minimum wall thickness be measured. The average of the four readings shall be the
average wall thickness. The percent concentricity shall be defined as 100 times the ratio of the minimum wall
thickness to the average wall thickness.
4.7.2 Dimensions. Measurements shall be made on not less than a 12 inch length of cable taken from the end
of the sample unit. Inner components shall be made accessible by stripping and removing the outer components so
as not to nick, cut, cold work or otherwise damage the component to be measured. Four points for measurement
shall be located 3 to 4 inches apart along the finished wire specimen or finished cable specimen lengths, as
applicable. Measurements shall be made at each point at two perpendicular planes or as required to assure the
minimum and maximum reading is attained at each point. A total of eight (8) measurements shall be performed on
each specimen. The minimum, maximum, and average value shall be recorded, as applicable. Measurements shall
be made with a micrometer, caliper, or equal. A PI-tape may be used for measurements of diameters greater than
0.250 inches.
4.7.3.1 Specimen. Each specimen shall consist of a single piece of armor wire, of not less than 6 inches in
length, which has been removed from a spool of armor wire prior to cable armoring. Each specimen shall be
removed from a different spool. Ten specimens shall be required.
4.7.3.2 Special apparatus. Apparatus shall include the following:
a. Mandre1. A ¼±1/64 inch diameter steel cylinder, of length and construction for the springiness test as
specified in 4.7.3.3.
b. Scale. A spring or other type scale, the measurement error of which shall not exceed ±5 percent for use in
the springiness and toughness tests specified in 4.7.3.3.
c. Special vise. A special vise, with 2 parallel edges of 0.030±0.001 inch radius between which a specimen
may be clamped to perform the toughness test as specified in 4.7.3.3.
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