1、 INCH-POUND MIL-DTL-24643/20F 1 October 2009 SUPERSEDING MIL-DTL-24643/20E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +105 C, 1000 VOLTS, TYPE LS7SGU This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for a
2、cquiring the product described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Watertight with Circuit Integrity First - Copper conductor, coated or uncoated (see table I for size). Second - Thermoset insulation (see table I for thickness). Third - Optional glass br
3、aid. Fourth - Optional covering (unless required by 3.3.5 of MIL-DTL-24643. Fifth - The seven conductors shall be cabled together with a lay in accordance with 3.4.4 of MIL-DTL-24643. Cabling sequence shall be consecutive, starting with no 1. from the center outward. Standard identification code app
4、lied by Method 1. Sixth - An optional binder. Seventh - Cross-linked polyolefin jacket. Minimum average wall thickness of 0.040 inch. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/20F TABLE I. Details. Military part
5、no. M24643/20 Type and size Conductor size AWG Cable overall diameter max. (inch) Insulation thickness min. avg. (inch) Conductor resistance max. (ohms) -01UN LS7SGU-3 16 (Class B) 0.545 0.018 4.3 -02UN LS7SGU-4 14 (Class B) 0.595 0.018 2.68 REQUIREMENTS: Qualification required. INSPECTION: Basic El
6、ectricals: Conductor resistance (ohms/1000 feet at 25 C, max.) See table I Voltage withstand (volts, root mean square, min.) Conductor to conductor 3000 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor continuity No failure Group A: Visual and dimensional No failu
7、re Abrasion resistance, extruded insulation only (scrapes min.) 250 Watertightness (see MIL-DTL-24643 for limits of water leakage) No failure Crack resistance (extruded insulation only) No damage Group B: Cold bending cable No failure Thermoset proof test (percent, max.) Insulation 50 Jacket (when t
8、ested at 200 C) 50 Drip (951C) ZeroPhysicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 Jacket (cable) Tensile strength (lb/in2, min.) 1300 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D
9、TL-24643/20F Elongation (percent, min.) 160 Tear (lb/in thickness, min.) 35 Gas flame (1 hour) No failure Group C: Physicals (aged) air oven Jacket (cable) Tensile strength (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Permanence of printing (cycles, min.) 25 Permanence of pri
10、nting (jacket) (cycles, min.) 125 Heat distortion (percent of unaged, max.) 30 Cable fill (sealant) removability No failure Shrinkage No failure Group D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; pl
11、us the following: Cold working (minus 202 C) No damage Gas flame (3 hours) No failure 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 Fil
12、lers 0.2Insulation 0.2 Immersion (jacket) Tensile strength (percent of unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index (max.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/20F 4 Jacket 25 Fillers 45 Insulation 4
13、5Toxicity index (max.) Jacket 5 Fillers 5Insulation 1.5 Durometer (jacket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LS7SGU all sizes 2000 CHANGES FROM PREVIOUS ISSUE: Marginal notations a
14、re not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-024) Review Activities: Army AR, AV, CR Navy CG, EC DLA CC NOTE: The activities listed above were intereste
15、d 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-,-,-
