1、 INCH-POUND MIL-DTL-24643/42D 1 October 2009 SUPERSEDING MIL-DTL-24643/42C 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS1SU This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the p
2、roduct described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight First - Copper conductor, tin-coated, ASTM B286, 20 AWG 7 strands and 18 AWG, Class B stranding, ASTM B8 (7 by 0.0152 inches). For LS1SU-36, 32 AWG, Size 20 conductors and 4 AWG, Size 18
3、 conductors. For LS1SU-60, 60 AWG, Size 20 conductors. Second - Separator may be used at manufacturers option where required to provide free-stripping insulation. Third - Thermoset insulation. Nominal wall thickness of 0.017 inch. Wall thickness may vary from nominal as necessary in order for comple
4、ted cable to meet the specified electrical requirements. Fourth - Braided shield of 34 or 36 AWG, coated or uncoated copper. Braid angle of 30 to 35 degrees; minimum coverage of 85 percent. Fifth - Shield insulation of two polyester tapes, outer tape sealed. An alternate shield insulation may consis
5、t 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. For LS1SU-36, the four 18 AWG conductors shall be numbered 1 through 4. Sixth - The sp
6、ecified number of singles (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. Seventh - An optional binder. Eighth -
7、 Cross-linked polyolefin jacket (see table I for thickness). AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/42D TABLE I. Details. Overall diameter Military part no. M24643/42 Type and size Number of conductors Conduct
8、or size AWG no. Cable jacket thickness min. avg. (inch) min. (inch) max. (inch) -01UN LS1SU-36 4 32 18-7 20-7 0.075 0.910 0.985 -02UN LS1SU-60 60 20-7 0.100 1.210 1.310 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) ASTM B286,
9、 Size no. 20 7 10.93 ASTM B8, Size no. 18 (Class B) 7.05 Voltage withstand (volts, root mean square, min.) Conductor to component shield 2200 Component shield to component shield 500 Insulation resistance (megohms/1000 feet, min.) Conductor to component shield 500 Component shield to component shiel
10、d 100 Conductor continuity No failure Shield continuity No failure Group A: Visual and dimensional No failure Capacitance, 1 kilohertz (KHz) (pF/ft, max.) 72 Group B: Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Cold bending cable No failure Physicals (unaged)
11、Insulation (extruded) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/42D Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/i
12、n 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 (percent of unaged, min.) 60 Permanence of printing (jacket) (c
13、ycles, min.) 125 Heat distortion (percent of unaged, max.) 30 Shrinkage No failure Shield (conformance to material, construction and coverage) No failure Group D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C,
14、and D; plus 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 18Shield insulation 2 Halogen content (percent, max.) Jacket 0.2 Fillers 0.2Insulation 0.23 Provided by IHS
15、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/42D 4 Immersion (jacket) Tensile strength (percent of unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index (max.) Jacket 25 Fillers 45Insulation 45 Toxicity index (max.) Jacket .5 Fillers
16、 5Insulation 1.5Durometer (jacket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LS1SU-36 and -60 1000 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify
17、 changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-046) 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-,-,-
