1、 INCH-POUND MIL-DTL-24643/13E 1 October 2009 SUPERSEDING MIL-DTL-24643/13D 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, 300 VOLTS, TYPE LSTTRS This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acq
2、uiring the product described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight First - Copper conductor, coated or uncoated, 20 AWG, Class B stranding in accordance with ASTM B8. Second - Separator may be used at manufacturers option where required to p
3、rovide free-stripping insulation. Third - Thermoset insulation. Nominal wall thickness of 0.020 inch; wall thickness may vary from nominal as necessary, in order to meet the specified electrical requirements. Fourth - Two conductors, one black and one white (or natural), shall be cabled together to
4、form a pair. The length of lay shall be determined to permit a completed cable to meet the twisting and bending endurance tests. 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 - S
5、hield insulation of two polyester tapes with the 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 inch. The standard identification code shall be
6、 applied by Method 2. Eighth - The specified number of pairs (see table I) shall be cabled together. The length of lay(s) shall be required for the completed cable to meet the twisting and bending endurance tests. Cabling sequence to be consecutive, starting with No. 1, from the center outward. A si
7、ngle pair shall not be used as center for the cable core. Outer layer shall be left hand. Inner layer (s) direction of lay shall be at the manufacturers option. Fillers may be used as necessary to form a firm, well rounded assembly. Ninth - An optional binder. Tenth - Cross-linked polyolefin jacket
8、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-24643/13E TABLE I. Details. Overall diameter (inch) Military part no. M24643/13 Type and size Number of pairs Jacket wall thickness min. avg. (inch
9、) min. (inch) max. (inch) Roller diameter (inch) (max.) -01UN LSTTRS-2 2 0.050 0.629 0.680 2.0 -02UN LSTTRS-4 4 0.050 0.685 0.740 2.2 -03UN LSTTRS-6 6 0.050 0.814 0.880 3.0 -04UN LSTTRS-8 8 0.050 0.916 0.990 3.5 -05UN LSTTRS-10 10 0.050 0.999 1.080 4.0 -06UN LSTTRS-12 12 0.070 1.017 1.100 4.0 -07UN
10、LSTTRS-16 16 0.070 1.100 1.190 4.5 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) 11.95 Voltage withstand (volts, root mean square, min.) Conductor to conductor 2000 Conductor to shield 1000 Component shield to component shiel
11、d 200 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor to shield 200 Component shield to component shield 100 Conductor continuity No failure Shield continuity No failure Group A: Visual and dimensional No failure Capacitance Mutual capacitance at 1 megahertz (MHz
12、) (pF/ft, max.) 28 Capacitance unbalance (percent, max.) 10 Characteristic impedance at 1 MHz (ohms) Minimum 75 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/13E Maximum 90 Group B: Thermoset proof test (percent, max.) Insulation 50
13、 Jacket (when tested at 200 C) 50 Twisting and bending endurance (see table I for roller size) At 75 C (cycles, min.) 6000 At minus 302C (cycles, min.) 2000 Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 Jacket (cable) Tensile strength (lb
14、/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/in 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 (perc
15、ent 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 failure Group D: Flame propagation (cable) No failure Qualification Inspection: Qualification in
16、spection shall include basic electricals; groups A, B, C, and D; plus the following: Aging and compatibility (cable) (1255C) No failure 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/13E Abrasion resistance (jacket) (scrapes, min.) 7
17、5 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
18、45Insulation 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 UNIT ORDERING LENGTHS: Type and size Feet (nominal) LSTTRS all sizes 1500 CHANGES FROM PREVIOUS ISSUE: Margin
19、al notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/13E 5 Custodians: Preparing Activity: Army MI Navy SH
20、Navy SH (Project 6145-2008-017) 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-,-,-
