1、 INCH-POUND MIL-DTL-24643/68A 28 January 2010 SUPERSEDING MIL-DTL-24643/68 7 November 2007 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +105 C, 1000 VOLTS, TYPE LS4OW 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, extruded or taped (see table I for minimum average w
3、all). Third - Optional glass braid. Fourth - Optional covering, unless required (see 3.3.5 of MIL-DTL-24643). Fifth - Four conductors shall be cabled together to form a firm well-rounded assembly with a lay not less than 8 or greater than 16 times the cabled diameter. Standard identification code ap
4、plied by Method 1, 3, or 5. Fillers may be used as necessary to form a firm well-rounded assembly. Sixth - Aluminum foil/polyester tape/aluminum foil. 0.002-inch thick with 45 percent overlap. Seventh - Braided shield of tin-coated copper. AWG and coverage as necessary to comply with shield performa
5、nce requirements. Eighth - An optional binder. Ninth - Cross-linked polyolefin jacket (see table I for wall thickness). AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/68A TABLE I. Details. Overall diameter (inches) Mi
6、litary part no. M24643/68 (type) Conductors size (AWG) Insulation resistance (megohms) Insulation wall thickness min. avg.(inches) Jacket wall thickness min. avg.(inches) Min. Max. Conductor resistance per 1000 feet at 25 C(ohms) -01UO (LS4OW-3) 16 (Class B) 500 0.018 0.027 0.412 0.442 4.3 -02UO (LS
7、4OW-4) 14 (Class B) 500 0.018 0.028 0.437 0.469 2.68 -03UO (LS4OW-9) 10 (Class B) 500 0.018 0.036 0.559 0.600 1.08 -04UO (LS4OW-14) 9 (Class B) 500 0.018 0.040 0.772 0.828 0.859 -05UO (LS4OW-23) 7 (Class B) 500 0.030 0.050 0.900 0.965 0.543 -06UO (LS4OW-50) 3 (Class C) 200 0.030 0.050 1.084 1.163 0.
8、21 -07UO (LS4OW-75) 1 (Class C) 175 0.035 0.050 1.254 1.345 0.134 -08UO (LS4OW-100) 0 (Class D) 160 0.035 0.060 1.396 1.498 0.106 -085UO (LS4OW-150) 000 (Class D) 135 0.050 0.060 1.600 1.725 0.067 -09UO (LS4OW-200) 0000 (Class D) 125 0.050 0.060 1.850 1.984 0.053 REQUIREMENTS: Qualification Required
9、. 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 (sizes 3 9) 3000 Conductor to conductor (sizes 14 200) 5000 Conductor to shield (sizes 3 9) 5000 Conductor to shield (sizes 14 200
10、) 2500 Insulation resistance (megohms/1000 feet, min.) Sizes 3 200 See table I Conductor and shield continuity No failure 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/68A Jacket flaws No failure Group A: Visual and dimensional No f
11、ailure Watertightness (see MIL-DTL-24643 for limits of water leakage) No failure Crack resistance No damage (applicable to constructions using glass braids with coverings) Group B: Thermoset proof test (percent, max.) Insulation (extruded insulations only) 50 Jacket (when tested at 200 C) 50 Drip (9
12、51 C) Zero Cold bending (cable) No damage Gas flame (1 hour) No failure Physicals (unaged) Insulation (extruded insulation only) 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
13、, min.) 35 Group C: Physicals (aged, air oven) Jacket (cable) Tensile strength (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Shrinkage No failure Heat distortion (percent of unaged, max.) 30 Permanence of printing (conductor Method 1 only) 25 (cycles, min.) Permanence of print
14、ing (jacket) (cycles, min.) 125 Cable sealant removability No failure Surface transfer impedance Milliohms per meter, max. 700 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/68A EMP, response (db, min.) 60 Group D: Flame propagation
15、(cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; plus the following: Gas flame (3 hours) No failure Aging and compatibility (cable) (1255 C) No failure Abrasion resistance Jacket (75 scraps, min.) No damage Insulation (extr
16、uded insulation only, 250 scraps, min.) No damage Acid gas equivalent (percent, max.) Jacket 2 Fillers 2Insulation 18Halogen content (percent, max.) Jacket 0.2 Fillers 0.2 Insulation 0.2Immersion (jacket) Tensile strength (percent of unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke ind
17、ex, max. Jacket 25 Fillers 45Insulation 35 Toxicity index, max. Jacket 5 Fillers 5Insulation 1.5Durometer (jacket) Type A (hardness, min.) 80 Weathering (jacket) No failure 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/68A 5 UNIT OR
18、DERING LENGTHS: Type and size Feet (nominal) LS4OW 500 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: Army MI Navy SH Navy SH (Project 6145-2009-111
19、) 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-,-,-
