1、 INCH-POUND MIL-DTL-24643/37F 1 October 2009 SUPERSEDING MIL-DTL-24643/37E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS3U This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the pr
2、oduct described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight First - Copper conductor, coated or uncoated, 18 AWG size, Class B stranding (7 by 0.0152 inches). Second - Separator may be used at manufacturers option where required to provide free-st
3、ripping insulation. Third - Thermoset insulation. Nominal wall thickness of 0.023 inch; wall thickness may vary from nominal as necessary, in order for the completed cable to meet the specified electrical requirements. Colored insulation, one white, one black, and one red conductor for each triad. F
4、ourth - Three conductors (one black, one white, and one red) cabled together with a nominal lay of 3.5 inches to form a triad. Fifth - Identification braid on each triad. Standard identification code applied by Method 4. Sixth - The specified number of triads (see table I) shall be cabled together i
5、n accordance with 3.4.4 of MIL-DTL-24643. Cabling sequence shall be consecutive starting with no. 1 from the center outward. Fillers may be used as necessary to form a firm well-rounded assembly. Seventh - An optional binder. Eighth - Cross-linked polyolefin jacket (see table I for thickness) AMSC N
6、/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/37F TABLE I. Details. Overall diameter Military part no. M24643/37 Type and size Number of triads Cable jacket thickness min. avg. (inch) min. (inch) max. (inch) -01UN LS3U-3 3
7、 0.040 0.580 0.620 -02UN LS3U-7 7 0.040 0.760 0.810 -03UN LS3U-12 12 0.050 1.030 1.090 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 7.06 Voltage withstand (volts, root mean square, min.) Conductor to conductor 2000 Insulatio
8、n resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor continuity No failure Group A: Visual and dimensional No failure Capacitance Mutual capacitance, 1 kilohertz (KHz) (pF/ft, max.) 30 Capacitance unbalanced (percent max.) 8 Group B: Thermoset proof test (percent, max.) Insula
9、tion 50 Jacket (when tested at 200 C) 50 Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 2 Provided by IHSNot for ResaleNo reproduction or networking permitt
10、ed without license from IHS-,-,-MIL-DTL-24643/37F Tear (lb/in thickness, min.) 35 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 (pe
11、rcent of unaged, min.) 60 Permanence of printing (jacket) (cycles, min.) 125 Heat distortion (percent of unaged, max.) 30 Shrinkage No failure Group D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; plus
12、 the following: Aging and compatibility (cable) (1255 C) No failure Abrasion resistance (jacket) (scrapes, min.) 75 Acid gas equivalent (percent, max.) Jacket 2 Fillers 2 Insulation 18Halogen content (percent, max.) Jacket 0.2 Fillers 0.2Insulation 0.2 Immersion (jacket) Tensile strength (percent of
13、 unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index (max.) Jacket 25 Fillers 45Insulation 45 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/37F 4 Toxicity index (max.) Jacket 5 Fillers 5 Insulation 1.5Durometer (jac
14、ket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No Failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LS3U all sizes 1000 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify changes with respect to the pre
15、vious issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-041) 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-,-,-
