1、 AMSC N/A FSC 6145 INCH-POUND MIL-DTL-55021/2D SUPERSEDING 23 March 2011 MIL-DTL-55021/2C 11 August 2000 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, SHIELDED SINGLES, SHIELDED AND JACKETED SINGLES, TWISTED PAIRS AND TRIPLES, INTERNAL HOOKUP, -65 TO 200 oC This specification is approved for use by
2、all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-55021. REQUIREMENTS. Cable construction: The cable shall consist of shielded singles, shielded and jacketed singles, or twisted
3、 pairs or triples in accordance with MIL-DTL-55021 (see figure 1 herein). FIGURE 1. Shielded and jacketed cable. Type of wire(s): The insulated wires used in constructing the cable shall conform to NEMA HP3 (type E) or NEMA HP3 (type EE) as specified (see MIL-DTL-55021). All wires in the cable shall
4、 be of the same wire type and AWG size. Conductor stranding: Conductor stranding as specified in table I. Length of lay: The length of lay shall be 8 to 16 times the outside major axis diameter of the unshielded, unjacketed cable. Shield coverage and braid angle: If shielding is required by the cont
5、ract or order (see MIL-DTL-55021), the minimum allowable coverage shall be 90 percent, and the angle made by the shielding braid with the longitudinal axis of the twisted conductors shall be between 20 and 40 degrees. Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
6、se from IHS-,-,-MIL-DTL-55021/2D 2 TABLE I. Conductor strandingAWG . size Number of strands Nominal stranding (inch) Nominal diameter over conductor(inch) Maximum conductor dc resistance at 20 oC per 1000 ft. (ohms) 32 7 .0031 .010 173.0 30 7 .0040 .012 100.7 28 7 .0050 .015 63.8 26 7 .0063 .019 40.
7、5 24 19 .0050 .024 24.3 22 19 .0063 .030 15.1 20 19 .0080 .038 9.19 18 19 .0100 .048 5.79 16 19 .0113 .057 4.52 14 19 .0142 .071 2.88 12 19 .0179 .090 1.81 10 37 .0159 .119 1.19 8 133 .0113 .166 .658 6 133 .0142 .208 .418 Jacket materials: If jacketing is required by the contract or order (see MIL-D
8、TL-55021), the cable jacket shall be extruded or tape-wrapped polytetrafluoroethylene (PTFE), or fluorinated ethylene propylene (FEP), of uniform thickness as specified in table II. If the jacket is tape, two layers of tape shall be applied in opposite directions, each layer and adjacent convolution
9、s being properly sealed together to form a homogeneous wall. The surface of the jacket shall be smooth, although a slight spiral ridge of the tape shall not be cause for rejection. Pre-fused tape shall not be used. TABLE II. Jacket thicknessCable diameter . (under jacket) 1/ (inch) Nominal jacket th
10、ickness (inch) Minimum jacket thickness (inch) Under .300 .012 .008 .300 and over .016 .012 1/ When specifying a jacket thickness, both unshielded and shielded constructions are applicable. Heat resistance: The cable shall be conditioned at 2505 oC for 96+1, -0 hours. Changes from previous issue. Ma
11、rginal notations are not used in this revision to identify changes with respect to the previous issues due to the extensiveness of the changes. Referenced documents. In addition to MIL-DTL-55021, this document references the following: NEMA HP3 CONCLUDING MATERIAL Custodians: Preparing activity: Arm
12、y - MI DLA - CC Navy - AS Air Force - 85 (Project 6145-2011-013) DLA - CC Review activity: Army CR 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 using the Assist Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
