1、 INCH-POUND MIL-DTL-24643/31F 1 October 2009 SUPERSEDING MIL-DTL-24643/31E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS2SU, (INCLUDING VARIATION LS2SUS) This specification is approved for use by all Departments and Agencies of the Department of Defense. The re
2、quirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-24643. This cable can be manufactured in two variations: LS2SU and LS2SUS (double overall shield). Construction, Non-Watertight First - Copper conductor, coated or uncoated, ASTM B286, 22 AWG
3、7strands. Second - Separator may be used at manufacturers option where required to provide free-stripping insulation. Third - Thermoset insulation. Nominal wall thickness of 0.013 inch; wall thickness may vary from nominal as necessary, in order for the completed cable to meet the specified electric
4、al requirements. Colored insulation, one white and one black conductor for each pair. Fourth - Two conductors (one black and one white) cabled with a nominal lay of 2.5 inches to form a pair. Fifth - An optional binder. Sixth - Braided shield of 34 or 36 AWG, tin-coated copper. Braid angle of 20 to
5、40 degrees; minimum coverage of 85 percent. Seventh - Shield insulation of two 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
6、 inch. The standard identification code shall be applied by Method 2. Eighth - The specified number of pairs (see table I or II) 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
7、as necessary to form a firm well-rounded assembly. Ninth - An optional binder. Construction, Variant Type LS2SU Tenth - 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-
8、DTL-24643/31F Construction, Variant Type LS2SUS Tenth - Braided shield of tin-coated copper. Eleventh - Spirally-wrapped polyethylene terephthalate (polyester film) separator tape. Twelfth - Braided shield of tin-coated copper. Thirteenth - An optional binder. Fourteenth - Cross-linked polyolefin ja
9、cket (see table II for thickness) TABLE I. Details (unshielded). Overall diameter Military part no. M24643/31 Type and size Number of pairs Cable jacket thickness min. avg. (inch) min. (inch) max. (inch) -01UN LS2SU-3 3 0.050 0.480 0.520 -02UN LS2SU-7 7 0.050 0.610 0.660 -03UN LS2SU-10 10 0.050 0.77
10、0 0.830 -04UN LS2SU-14 14 0.063 0.860 0.930 -05UN LS2SU-19 19 0.063 0.970 1.040 -06UN LS2SU-24 24 0.063 1.120 1.210 -07UN LS2SU-30 30 0.063 1.190 1.280 -08UN LS2SU-37 37 0.063 1.290 1.380 -09UN LS2SU-44 44 0.063 1.460 1.550 -10UN LS2SU-61 61 0.075 1.660 1.740 TABLE II. Details (shielded). Overall di
11、ameter Military part no. M24643/31 Type and size Number of pairs Cable jacket thickness min. avg. (inch) min. (inch) max. (inch) -01UD LS2SUS-3 3 0.050 0.540 0.580 -02UD LS2SUS-7 7 0.050 0.670 0.720 -03UD LS2SUS-10 10 0.050 0.830 0.890 -04UD LS2SUS-14 14 0.063 0.920 0.990 -05UD LS2SUS-19 19 0.063 1.
12、030 1.100 -06UD LS2SUS-24 24 0.063 1.180 1.270 -07UD LS2SUS-30 30 0.063 1.250 1.340 -08UD LS2SUS-37 37 0.063 1.350 1.440 -09UD LS2SUS-44 44 0.063 1.520 1.610 -10UD LS2SUS-61 61 0.075 1.720 1.800 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D
13、TL-24643/31F REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 17.37 Voltage withstand (volts, root mean square, min.) Conductor to conductor 2000 Conductor to shield 1000 Component shield to all other shields 500 Overall shield
14、to overall shield (Type LS2SUS only) 200 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor to shield 500 Component shield to all other shields 100 Overall shield to overall shield (Type LS2SUS only) 100 Conductor continuity No failure Shield continuity No failure J
15、acket flaws (Type LS2SUS only) No failure Group A: Visual and dimensional No failure Capacitance Mutual capacitance, at 1 kilohertz (KHz) (pF/ft, max.) 30 Capacitance unbalance (percent max.) 8 Characteristic impedance, at 1 megahertz (MHz) (ohms) 75 5 Group B: Cold bending cable No failure Thermose
16、t proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/31
17、F Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/in thickness, min.) 35 Attenuation, at 3 MHz (decibel (db)/100 ft max.) 3.0 Group C: Physicals (aged) air oven Insulation (extruded) Tensile strength (percent of unaged, min.) 75 Elongation (percent of unag
18、ed, min.) 75 Jacket (cable) Tensile strength (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 Shrinkage No failure Shield (conformance to material, construction and coverage) No failur
19、e Surface transfer impedance (Type LS2SUS only) Milliohms per meter (max.) 700 EMP response (dB, min.) 60 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 compatibili
20、ty (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 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
21、m IHS-,-,-MIL-DTL-24643/31F 5 Fillers 0.2 Insulation 0.2Immersion (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 5Insulation 1.5Durometer (jacket) - Type A (har
22、dness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Types Sizes Feet (nominal) LS2SU and LS2SUS 3 through 30 1000 LS2SU and LS2SUS 37 through 61 500 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify c
23、hanges with respect to the previous issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-035) 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-,-,-
