1、 INCH-POUND MIL-DTL-24643/4E 1 October 2009 SUPERSEDING MIL-DTL-24643/4D 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +90 C, 600 VOLTS, TYPE LSMCOS This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acqui
2、ring the product described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight First - Copper conductor, coated or uncoated, Class K (see table I for size). Second - Separator may be used at manufacturers option where required to provide free-stripping in
3、sulation. Third - Thermoset insulation (see table I for wall thickness) Sizes 2, 4, and 7 shall have special identification code applied by Method 3. Size 5 shall have one shielded pair (colors black and white) and 3 singles (colors red, green, and blue) applied by Method 3. Size 6 shall have two sh
4、ielded pairs (colors black and white for first pair and blue and red for second pair) and two singles (colors yellow and green) applied by Method 3. Fourth - (For all pairs only) An optional binder. Fifth - (For all pairs only) Braided shield of 34 or 36 AWG coated or uncoated copper. Braid angle 30
5、 to 35 degrees; minimum coverage of 88 percent. Sixth - The required number of singles and shielded pair(s) to be cabled together with a left-hand lay. The length of lay (pairs and cables) shall be as required for the completed cable to meet the twisting and bending endurance tests; and for Sizes 5
6、and 6, the additional mutual inductance test. Fillers may be used as necessary to form a firm, well-rounded assembly. A single conductor (or pair) shall not be used as a central core for the cable. The Size 7 cable shall have a central core of fiberglass. Seventh - An optional binder. Eighth - Braid
7、ed shield of 34 or 36 AWG coated or uncoated copper. Braid angle of 30 degrees minimum; minimum coverage of 88 percent. Ninth - An optional binder. Tenth - Cross-linked polyolefin jacket. Minimum average wall thickness of 0.040 inch. NOTE: Omit eighth and ninth construction steps for Sizes 5 and 6.
8、AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/4E TABLE I. Details. Conductors Overall diameter Military part no. M24643/4 Type and size No. of condr. AWG Insulation thickness min. average (inch) min. (inch) max. (inc
9、h) Voltage withstand conductor to conductor (volts) Insulation resistance minimum (megohms) Conductor resistance maximum (ohms) -01UO LSMCOS-2 2 18 0.023 0.440 0.460 2000 200 6.96 -02UO LSMCOS-4 4 18 0.023 0.490 0.510 2000 200 6.96 -03UN LSMCOS-5 5 20 0.013 0.375 0.390 1000 100 11.28 -04UN LSMCOS-6
10、6 20 0.013 0.460 0.480 1000 100 11.28 -05UO LSMCOS-7 7 18 0.023 0.575 0.595 2000 200 6.96 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/1000 feet at 25 C, max.) See table I Voltage withstand (volts, root mean square, min.) Conductor to conductor See
11、table I Conductor to shield (pair or overall) 500 Overall shield to ground (LSMCOS-2, -4, and -7 only) 1500 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor See table I Conductor to shield (pair or overall) See table I Conductor continuity No failure Shield continuity No failur
12、e Group A: Visual and dimensional No failure Group B: Cold bending (flexing cable) No failure Thermoset proof test (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Physicals (unaged) Insulation (extruded) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without li
13、cense from IHS-,-,-MIL-DTL-24643/4E 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 Twisting and bending endurance At 75 C (cycles, min.) 6000 At minus 302 C (cycles,
14、 min.) 2000 NOTE: Roller diameters for bending endurance test shall be as follows: Cable type and size Roller diameter(inch, max) LSMCOS-2 1.4 LSMCOS-4 1.5 LSMCOS-5 1.2 LSMCOS-6 1.4 LSMCOS-7 1.8 Group C: Physicals (aged) air oven Insulation (extruded) Tensile strength (percent of unaged, min.) 75 El
15、ongation (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, max.) 30 Shrinkage No failure Mutual inductance (LSMCOS-5 and LSMCOS-6 onl
16、y) Microhenries (max.) 0.0135 Shield (conformance to material, construction and coverage) No failure Group D: Flame propagation (cable) No failure 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/4E Qualification Inspection: Qualificat
17、ion 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 Acid gas equivalent (percent, max.) Jacket 2 Fillers 2 Insulation 18Halogen content (percent, max.) Jacket 0.
18、2 Fillers 0.2Insulation 0.2 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 1.5Durometer (jacket) - Type A (hardness, min.) 80 Weathering (
19、jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) All types and sizes 2000 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 chan
20、ges. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/4E 5 Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-009) Review Activities: Army AR, AV, CR Navy CG, EC DLA CC NOTE: The activities listed above were int
21、erested 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-,-,-
