1、 INCH-POUND MIL-DTL-24643/25F 1 October 2009 SUPERSEDING MIL-DTL-24643/25E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +150 C, TYPE LSPI This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the p
2、roduct described herein shall consist of this specification sheet and MIL-DTL-24643. Construction, Non-Watertight with Circuit Integrity First - Copper conductor, nickel-coated, AWG 18, Class B stranding. Second - Extruded silicone rubber insulation. Minimum average wall thickness 0.018 inch. Third
3、 Glass braid. Fourth - Transparent braid covering. Fifth - Two conductors (one colored black and one colored white for each pair of conductors) cabled together to form a pair with a lay not greater that 2.25 inches. Sixth - An optional binder. Seventh - Braided shield of 34 or 36 AWG uncoated coppe
4、r over each pair. Minimum coverage of 85 percent. Eighth - Shield insulation over each pair shield, consisting of polyethylene terephthalate film, 0.001 inch thick, applied helically with 50 percent overlap. Ninth - A glass braid over each shield insulation (standard identification code applied by M
5、ethod 4). Tenth - The specified number of pairs (see table I) cabled together with a lay not greater than 14 inches. Fillers may be used as necessary to form a firm well-rounded assembly. Cabling sequence shall be consecutive, starting with pair 1 from the center outward. Eleventh - A binder applied
6、 helically with overlap. Twelfth - Silicone rubber jacket colored orange or red (see table I for thickness). Thirteenth - Braided metal armor. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/25F TABLE I. Details. Overa
7、ll cable Military part no. M24643/25 Type and size No. of pairs Jacket thickness min. avg. (inch) Diameter max. (inch) -01AN LSPI-3 3 0.050 0.685 -02AN LSPI-7 7 0.063 0.900 -03AN LSPI-12 12 0.063 1.155 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: Conductor resistance (ohms/10
8、00 feet at 25 C, max.) 7.5 Voltage withstand (volts, root mean square, min.) Conductor to conductor 1200 Conductor to shield 1200 Shield to shield 500 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor to shield 500 Shield to shield 100 Conductor continuity No failu
9、re Shield continuity No failure Group A: Visual and dimensional No failure NOTE: The nickel coating on the conductors of the completed cable shall be permitted to have minor nicks, scrapes, or abrasions that are just perceptible to the eye. Group B: Cold bending cable No failure Thermoset proof test
10、 (percent, max.) Insulation 50 Jacket (when tested at 200 C) 50 Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/25F Elongation (percent, min.) 150 Jacket (ca
11、ble) Tensile strength (lb/in2, min.) 800 Elongation (percent, min.) 250 Durometer (jacket) - Type A (hardness, min.) 60 Gas flame (1 hour) No failure Group C: Physicals (cable aging) (26010 C) Jacket (cable) Tensile strength (lb/in2, min.) 600 Elongation (percent, min.) 150 Group D: Flame propagatio
12、n (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 Armor (conformance to material, construction and coverage) No failure
13、 Acid gas equivalent (percent, max.) Jacket 2 Fillers 2 Insulation 18Halogen content (percent, max.) Jacket 0.2 Fillers 0.2Insulation 0.2 Smoke index (max.) Jacket 35 Fillers 45Insulation 35Toxicity index (max.) Jacket 5 Fillers 5 3 Provided by IHSNot for ResaleNo reproduction or networking permitte
14、d without license from IHS-,-,-MIL-DTL-24643/25F 4 Insulation 1.5 Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (minimum) All sizes 100 CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify changes with respect to the previous
15、 issue due to the extent of the changes. Custodians: Preparing Activity: Army MI Navy SH Navy SH (Project 6145-2008-029) 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-,-,-
