1、 INCH-POUND MIL-DTL-24643/28F 1 October 2009 SUPERSEDING MIL-DTL-24643/28E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, TYPE LS1S50MU (INCLUDING VARIATION LS1S50MUS) This specification is approved for use by all Departments and Agencies of the Department of Defense. T
2、he requirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-24643. This cable can be manufactured in two variations: LS1S50MU and LS1S50MUS (double overall shield). Construction, Non-Watertight First - Copper conductor, tin-coated, ASTM B286, Size
3、 22 7strands. Second - Separator may be used at manufacturers option where required to provide free-stripping insulation. Third - Thermoset insulation, white. Nominal wall thickness of 0.030 inch; wall thickness may vary from nominal as necessary, in order for completed cable to meet the specified e
4、lectrical requirements. Fourth - Braided shield of 36 AWG, tin-coated copper. Braid angle of 20 to 25 degrees; minimum coverage of 90 percent. Fifth - Shield insulation of two polyester tapes, outer tape sealed. An alternate shield insulation may consist of one polyester tape plus an extruded jacket
5、 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 on the inner tape. Sixth - The required number of singles (see table I or II) cabled with a lay in accordance with 3.4.4 of MIL-DTL-246
6、43. Cabling sequence shall be consecutive, starting with no. 1. in the center outward. Fillers may be used as necessary to make a firm, well-rounded assembly. Seventh - An optional binder. Construction, Variant for Type LS1S50MU Eighth - Cross-linked polyolefin jacket. Minimum average wall thickness
7、 0.050 inch. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/28F Construction, Variant for Type LS1S50MUS Eighth - Braided shield of tin-coated copper with a minimum coverage of 85 percent. Ninth - Spirally wrapped 0.0
8、02-inch thick polyethylene (polyester film) separator tape with 25 percent minimum lap. Tenth - Braided shield of tin-coated copper with a minimum coverage of 85 percent. Eleventh - Cross-linked polyolefin jacket. Minimum average wall thickness 0.050 inch. TABLE I. Details (unshielded). Overall diam
9、eter Military part no. M24643/28 Type and size Number of conductors Diameter over core nom. (inch) min. (inch) max. (inch) -01UN LS1S50MU-16 16 0.655 0.760 0.825 -02UN LS1S50MU-20 20 0.760 0.835 0.905 -03UN LS1S50MU-40 40 1.015 1.095 1.185 -04UN LS1S50MU-70 70 1.380 1.465 1.555 TABLE II. Details (sh
10、ielded). Overall diameter (inch) Military part no. M24643/28 Type and size Number of conductors Diameter over core (inch) (nom.) min. max. -01UD LS1S50MUS-16 16 0.655 0.820 0.885 -02UD LS1S50MUS-20 20 0.760 0.895 0.965 -03UD LS1S50MUS-40 40 1.015 1.155 1.245 -04UD LS1S50MUS-70 70 1.380 1.525 1.615 R
11、EQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 17.54 Voltage withstand (volts, root mean square, min.) Conductor to shield 5000 Component shield to component shield 500 Overall shield to overall shield (Type LS1S50MUS only) 200
12、 Insulation resistance (megohms/1000 feet, min.) Conductor to shield 2500 Component shield to component shield 100 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/28F Overall shield to overall shield (Type LS1S50MUS only) 100 Conducto
13、r continuity No failure Shield continuity No failure Jacket flaws (Type LS1S50MUS only) No failure Group A: Visual and dimensional No failure Characteristic impedance, at 1 megahertz (MHz) (ohms) 502 Group B: Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Attenua
14、tion, at 400 MHz (decibel (db)/100 ft max.) 18 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 Tear (lb/in thickness, min.) 35 Group C: Physicals (aged) air
15、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) (cycles, min.) 125 Heat distortion (percent of unaged,
16、 max.) 30 Shrinkage No failure Shield (conformance to material, construction and coverage) No failure Surface transfer impedance (Type LS1S50MUS only) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/28F Milliohms per meter (max.) 700
17、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 compatibility (cable) (1255 C) No failure Abrasion resistance (jacket) (scrapes, min.) 75
18、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 unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index (max.) Jacket 25 Fillers 45
19、Insulation 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 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-246
20、43/28F 5 UNIT ORDERING LENGTHS: Type and size Feet (nominal) LS1S50MU and LS1S50MUS - all sizes 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:
21、Army MI Navy SH Navy SH (Project 6145-2008-032) 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-,-,-
