1、 INCH-POUND MIL-DTL-24643/57F 1 October 2009 SUPERSEDING MIL-DTL-24643/57E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS2UW (INCLUDING VARIATION LS2UWS) This specification is approved for use by all Departments and Agencies of the Department of Defense. The req
2、uirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-24643. This cable can be manufactured in two variations: LS2UW and LS2UWS (double overall shield). Construction, Watertight First - Copper conductor, tin-coated, 26 AWG, 7 strands, ASTM B286. S
3、econd - Separator may be used at manufacturers option where required to provide free-stripping insulation. Third - Thermoset insulation nominal wall thickness 0.010 inch; wall thickness may vary from nominal as necessary, in order for completed cable to meet the specified electrical requirements. Te
4、lephone identification code shall be applied by Method 3. Fourth - Two conductors cabled together with a nominal lay of 1 inches to form a pair. Fifth - Forty-two pairs cabled together with a lay in accordance with 3.4.4 of MIL-DTL-24643. Cabling sequence shall be consecutive, starting with no. 1 fr
5、om the center outward. Fillers may be used as necessary to form a firm, well-rounded assembly. Sixth - An optional binder. Seventh - Braided shield of tin-coated copper. Construction, Variant for Type LS2UW Eighth - An optional binder. Ninth - Cross-linked polyolefin jacket. Minimum average wall thi
6、ckness of 0.065 inch. Overall cable diameter shall be 0.750 inch minimum, 0.790 inch maximum. Construction, Variant for type LS2UWS Eighth - Spirally-wrapped polyethylene terephthalate (polyester film) separator tape. Ninth - Braided shield of tin-coated copper. Tenth - An optional binder. AMSC N/A
7、FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/57F Eleventh - Cross-linked polyolefin jacket. Minimum average wall thickness of 0.065 inch. Overall cable diameter shall be 0.785 inch minimum, 0.825 inch maximum. NOTES: 1. Vari
8、ant LS2UW-42 military part number M24643/57-01UO. 2. Variant LS2UWS-42 military part number M24643/57-03UD. REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 45.19 Voltage withstand (volts, root mean square, min.) Conductor to co
9、nductor 2000 Conductor to overall shield 1000 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor to overall shield 500 Overall shield to overall shield 100 Conductor and shield continuity No failure Jacket flaws No failure Group A: Visual and dimensional No failure
10、Characteristic impedance, at 1 megahertz (MHz) (ohms) 11515 Watertightness, leakage (in3, max.) 1.0 Group B: Cold bending cable No failure Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Drip (951 C) Physicals (unaged) Insulation (extruded) Tensile strength (lb/in
11、2, min.) 700 Elongation (percent, min.) 150 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/57F Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/in thickness, min.) 35 Bending endurance At 25
12、 C (cycles, min.) 25 Group C: Physicals (aged) air oven Insulation (extruded) Tensile strength (percent of unaged, min.) 75 Elongation (percent of unaged, min.) 75 Jacket (cable) Tensile strength (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Permanence of printing (jacket) (cy
13、cles, min.) 125 Heat distortion (percent of unaged, max.) 30 Shrinkage No failure Cable fill (sealant) removability No failure Shield conformance to material, construction and coverage No failure Surface transfer impedance (Type LS only) Milliohms per meter (max.) 700 EMP response (dB, min.) 60 Grou
14、p D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; plus the following: Aging and compatibility (cable) (1255 C) No failure Abrasion resistance (jacket) (scrapes, min.) 75 Acid gas equivalent (percent, m
15、ax.) Jacket 2 Fillers 2 Insulation 18Shield insulation 2 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/57F 4 Halogen content (percent, max.) Jacket 0.2 Fillers 0.2 Insulation 0.2Immersion (jacket) Tensile strength (percent of unaged
16、, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index, (max.) Jacket 25 Fillers 45Insulation 45 Toxicity index (max.) Jacket 5 Fillers 5Insulation 1.5Durometer (jacket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTH
17、S: Type and size Feet (nominal) LS2UW-42 and LS2UWS-42 1000 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-200
18、8-061) Review Activities: Army AR, AV, CR Navy CG, EC DLA CC NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
