1、 INCH-POUND MIL-DTL-24643/33F 1 October 2009 SUPERSEDING MIL-DTL-24643/33E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS2SWU This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the
2、product described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Watertight First - Copper conductor, tin-coated, 18 AWG, Class B stranding (7 by 0.0152 inches) in accordance with ASTM B8. Second - Separator may be used at manufacturers option where required to pro
3、vide free-stripping 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 and one black conductor for each pair.
4、Fourth - Two conductors (one black and one white) cabled together with a nominal lay of 3 inches to form a pair. Fifth - An optional binder. Sixth - Braided shield of 34 or 36 AWG, tin-coated copper. Braid angle of 30 to 35 degrees; minimum coverage of 85 percent. Seventh - Shield insulation of two
5、polyester tapes, outer tape sealed. An alternate shield insulation may consist of one polyester tape, plus an extruded jacket of a suitable transparent material, minimum average thickness of the transparent material 0.003 inch. The standard identification code shall be applied by Method 2. Eighth -
6、The specified number of pairs (see table I) shall be cabled together in 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. Ninth - An optional binder. Tenth
7、 Cross-linked polyolefin jacket (see table I for thickness). NOTE: For LS2SWU-1, omit seventh and eighth. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/33F TABLE I. Details. Overall diameter Military part no. M24643
8、/33 Type and size Number of pairs Cable jacket thickness min avg. (inch) min. (inch) max. (inch) -01UN LS2SWU-1 1 0.015 0.240 0.255 -02UN LS2SWU-3 3 0.075 0.670 0.710 -03UN LS2SWU-7 7 0.075 0.860 0.910 -04UN LS2SWU-12 12 0.088 1.130 1.200 -05UN LS2SWU-19 19 0.100 1.292 1.380 -06UN LS2SWU-24 24 0.100
9、 1.500 1.590 -07UN LS2SWU-30 30 0.100 1.670 1.760 -08UN LS2SWU-37 37 0.125 1.785 1.870 -09UN LS2SWU-61 61 0.125 2.205 2.300 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 7.47 Voltage withstand (volts, root mean square, min.)
10、Conductor to conductor 2000 Conductor to shield 1000 Component shield to component shield 500 Insulation resistance (megohms.1000 feet, min.) Conductor to conductor 500 Conductor to shield 500 Component shield to component shield 100 Conductor continuity No failure Shield continuity No failure Group
11、 A: Visual and dimensional No failure Hydrostatic (open end) (leakage at 300 lb/in2, 2 hours, in, max.) 1.0 Capacitance Mutual capacitance, at 1 kilohertz (KHz) (pF/ft, max.) 30 Capacitance unbalance (percent max.) 8 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
12、nse from IHS-,-,-MIL-DTL-24643/33F Characteristic impedance, at 1 megahertz (MHz) (ohms) 755 Group B: Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Drip (951 C) Zero Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 Elongation (percent
13、 min.) 150 Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 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 strengt
14、h (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Permanence of printing (jacket) (cycles, min.) 125 Heat distortion (percent of unaged, max.) 30 Cable fill (sealant) removability No failure Shrinkage No failure Shield (conformance to material, construction and coverage) No fail
15、ure Group 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 3 Provided by IHSNot fo
16、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/33F Acid gas equivalent (percent, max.) Jacket 2 Fillers 2 Insulation 18Shield insulation 2 Halogen content (percent, max.) Jacket 0.2 Fillers 0.2Insulation 0.2Immersion (jacket) Tensile strength (percent of u
17、naged, 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 LE
18、NGTHS: Type Size Feet (nominal) LS2SWU 1 through 12 1500 LS2SW 19 through 24 1000 LS2SWU 30 through 61 500 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. 4 Provided by IHSNot for R
19、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/33F 5 Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-037) 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-,-,-
