MIL-DTL-10392F
3.12.2 Cord WM-70B/U. The insulated conductors of cord WM-70B/U shall be twisted around a central
staycord in the configuration specified on figure 1.
3.12.3 Cord WM-111A/U. The insulated conductors of cord WM-111A/U shall be twisted with fillers
around a central staycord in the configuration specified on figure 1.
3.13 Outer separator. A separator shall be applied over the cabled conductors. The separator shall
consist of a suitable number of ends of yarn or polyester tape closely wound to cover the cabled
conductors.
3.14 Jacket. A smooth, dense, SBR jacket, type JS or type JS-L, shall be applied over the outer
separator. The minimum jacket thickness shall be 0.015 inch (.38 mm) for cord WD-27A/U and 0.020 inch
(.51 mm) for the remaining cords. The outside diameters of the cords shall be as specified in table 1, with
a tolerance of ±0.010 inch (.25 mm).
3.15 Cord tensile strength. When tested as specified in 4.5.6, cord WD-27A/U shall have a breaking
strength of not less than 50 pounds; the remaining cords shall have a breaking strength of not less than
60 pounds. Continuity of all conductors shall be maintained to at least the minimum breaking strength
specified herein.
3.16 Identification marking. Cords shall be identified by inked markings. Inked markings shall be clear
and legible, shall be resistant to moisture and oil, and shall not readily abrade when the cord is stepped or
tramped upon or dragged on the ground when subjected to the cold bend test. The inked marking shall
consist of the type designation followed by the number of this specification and year of manufacture.
Digits indicating footage may be used at the option of the manufacturer. The marking shall be repeated
along the cord at intervals not more than one foot apart.
3.17 Electrical requirements.
3.17.1 Dielectric withstanding voltage. The insulated conductors shall withstand without breakdown an
applied voltage of 500 volts (rms) when tested as specified in 4.5.7.
3.17.2 Insulation resistance. Immediately after the insulated conductors have withstood the dielectric
withstanding voltage test, the insulation resistance shall be measured as specified in 4.5.8. The
insulation resistance of the insulated conductors shall not be less than 600 megohms-1000 ft.
3.17.3 Conductor resistance. Each conductor in the finished cord shall be continuous and shall have a
direct-current (dc) resistance at or corrected to 20º C, as specified on table III. If the resistance value is
lower of equal to that specified when the measurement is made at a temperature greater than 20º C, no
correction factor is needed (see 4.5.9).
TABLE III. Conductor resistance.
Conductor size (AWG)
DC resistance (ohms,max./1000 ft.)
24
39.0
18
9.7
6
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