1、 INCH-POUND MIL-DTL-24643/44F 1 October 2009 SUPERSEDING MIL-DTL-24643/44E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, 600 VOLTS, TYPE LS3SF This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acqu
2、iring the product described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight First - Copper conductor, coated or uncoated, 18 AWG, Class B stranding, ASTM B8, (7 by 0.0152 inches). Second - Separator may be used at manufacturers option where required t
3、o provide free-stripping insulation. Third - Thermoset insulation. Nominal wall thickness 0.020 inch; wall thickness may vary from nominal as necessary in order for completed cable to meet the specified electrical requirements. Fourth - Three conductors (one black, one white, and one red), shall be
4、cabled together with a nominal lay or 1 inches to form a triad. Fifth - An optional binder. Sixth - Braided shield of 34 or 36 AWG coated or uncoated copper. Braid angle of 30 to 35 degrees. Minimum coverage of 85 percent. Seventh - Shield insulation of two polyester tapes, outer tape sealed. An alt
5、ernate 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 - The specified number of triads (see table I
6、) cabled around a central filler, with a lay in accordance with 3.4.4 of MIL-DTL-24643. Cabling sequence shall be consecutive. A single triad shall not be used as the central core of the cable. Fillers may be used as necessary to form a firm, well-rounded assembly. Ninth - An optional binder. Tenth
7、- Cross-linked polyolefin jacket. Minimum average wall thickness of 0.080 inch. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/44F TABLE I. Details. Overall diameter Military part no. M24643/44 Type and size Number of
8、 triads min. (inch) max. (inch) -01UN LS3SF-7 7 1.000 1.040 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 7.06 Voltage withstand (volts, root mean square, min.) Conductor to conductor 2000 Conductor to shield 1000 Component s
9、hield 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 A: Visual and dimensional No failure Capacitance Mutual capacit
10、ance, 1 kilohertz (KHz) (pF/ft, max.) 30 Capacitance unbalanced (percent max.) 10 Group B: Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Cold bending cable at minus 302 C No failure Bending endurance at 252 C (cycles, min.) 25 Physicals (unaged) Insulation (extr
11、uded) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/44F 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
12、.) 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) (cycles, min.) 125
13、 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, and D; plus the
14、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 IHSNot for ResaleNo
15、 reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/44F 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 5Insulation 1.5D
16、urometer (jacket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LS3SF-7 1000 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify changes with respect to t
17、he previous issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-048) 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-,-,-
