1、 INCH-POUND MIL-DTL-24643/21F 1 October 2009 SUPERSEDING MIL-DTL-24643/21E 22 August 2002 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -20 C TO +105 C, TYPES LSTCJU AND LSTCTU 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 - One iron and one constantan conductor in Type LSTCTU, for Type J thermocouple in accordance with ANSI MC96.1; one copper and one constantan in Ty
3、pe LSTCTU, for Type T thermocouple in accordance with ANSI MC96.1 (see table I for diameter). Second - Thermoset insulation (see table I for diameter). Third - Optional glass braid. Fourth - Covering. Printed identification as follows: Type LSTCJU shall have the legend “8 (GRAY)” printed on the iron
4、 conductor and the legend “3 (RED)” printed on the constantan conductor. Type LSTCTU shall have the legend “6 (BLUE)” printed on the iron conductor and the legend “3 (RED)” printed on the constantan conductor (see table I for diameter). Fifth - The two conductors shall be cabled together with a lay
5、in accordance with 3.4.4 of MIL-DTL-24643. Fillers may be used as necessary to form a firm, well-rounded assembly. Sixth - An optional binder. Seventh - Cross-linked polyolefin jacket. Minimum average wall thickness of 0.040 inch. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or net
6、working permitted without license from IHS-,-,-MIL-DTL-24643/21F TABLE I. Details. Overall diameter Military part no. M24643/21 Type and size Numbers of strands and strand diameter (inch) Diameter over insulation min. avg. (inch) Diameter over covering max. (inch) min. (inch) max. (inch) -01UN LSTCJ
7、U-4 7/0.025 0.105 0.140 0.400 0.430 -02UN LSTCTU-4 7/0.025 0.105 0.140 0.400 0.430 REQUIREMENTS: Qualification required. INSPECTIONS: Basic Electricals: Voltage withstand (volts, root mean square, min.) Conductor to conductor 3000 Insulation resistance (megohms/1000 feet, min.) Conductor to conducto
8、r 500 ANSI MC96.1 calibration limits of error Type LSTCJU 2.2 C Type LSTCTU 1 C Conductor continuity No failure Group A: Visual and dimensional No failure Abrasion resistance, extruded insulation only (scrapes min.) 250 Watertightness (see MIL-DTL-24643 for limits of water leakage) No failure Crack
9、resistance, extruded insulation only No damage Group B: Cold bending cable No failure Thermoset proof test (percent, max.) Insulation 50Jacket (when tested at 200 C) 50 Drip (951 C) Zero Physicals (unaged) Insulation (extruded) Tensile strength (lb/in2, min.) 700 2 Provided by IHSNot for ResaleNo re
10、production or networking permitted without license from IHS-,-,-MIL-DTL-24643/21F Elongation (percent, min.) 150 Jacket (cable) Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/in thickness, min.) 35 Gas flame (1 hour) No failure Group C: Physicals (aged) air oven Jacket
11、(cable) Tensile strength (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Permanence of printing (cycles, min.) 25 Permanence of printing (jacket) (cycles, min.) 125 Heat distortion (percent of unaged, max.) 30 Cable fill (sealant) removability No failure Shrinkage No failure Gro
12、up D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; plus the following: Cold working (minus 202 C) No damage Gas flame (3 hours) No failure Aging and compatibility (cable) (1255 C) No failure Abrasion r
13、esistance (jacket) (scrapes, min.) 75 Acid gas equivalent (percent, max.) Jacket 2 Fillers 2 Insulation 18Halogen content (percent, max.) Jacket 0.2 Fillers 0.2Insulation 0.2 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/21F 4 Immer
14、sion (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 (jacket) No failure Electrical moi
15、sture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LSTCJU-4 and LSTCTU-4 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 changes. Custodians: Preparing Acti
16、vity: Army MI Navy SH Navy SH (Project 6145-2008-025) 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-,-,-
