MIL-DTL-13486E
3.4.4.2 Coverage. The shielding shall provide not less than 85 percent coverage of the surface of the
underlying cable components. Percent of coverage shall be calculated as follows:
Percent of coverage = (2F-F2) 100
ND
F = P (Cos angle of advance)
Where:
N = Number of parallel strands between successive turns of a selected marker strand plus
the selected strand.
D = Diameter of a single strand.
Angle of advance = Angle whose tangent equals P/C.
P = Pitch of braid measured along the axis of the braid.
C = 3.14 (Outside diameter (OD) of cable 2D).
3.4.4.3 Grounding of shielding (class B only). Shielded insulated conductors (see 6.4) of
multiconductor cable shall be electrically connected in such a manner that grounding of the shielding of
one insulated conductor will result in grounding of all shielding within the outer sheath.
3.4.5 Concentricity. The minimum thickness of the cross section of the insulation around each
conductor and of the cable sheath shall be at least .60 of the corresponding maximum wall thickness.
3.4.5.1 Wall thickness. The maximum wall thickness of an insulated conductor shall be the
maximum distance between the inner and outer surfaces of the insulation when measured along a line
through the center of the circle defined by the outer surface of the insulation. The minimum wall
thickness of the insulation shall be a similar distance measured along the same line, on the opposite side
of the conductor.
3.4.5.2 Wall thickness ratio. The ratio of the sheath minimum wall thickness shall be at least .60 of
the corresponding maximum wall thickness. (This requirement does not apply to two-conductor cable.)
3.5 Performance.
3.5.1 Insulation flaws. Insulated conductors shall withstand the voltage specified in table II without
breakdown.
TABLE II. Voltage requirement for insulated conductors.
Voltage (V rms) 1/
Conductor size
20 to 12
2,000
10 to 8
2,000
6 to 0000
3,000
1/ The frequency shall be 60 Hertz (Hz).
3.5.2 Finished cable flaws. Finished cables shall withstand the voltage specified in table III without
breakdown.
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