1、AMSC N/A FSC 6145 INCH-POUND MIL-DTL-3702F 18 April 2012 SUPERSEDING MIL-DTL-3702E 15 January 2009 DETAIL SPECIFICATION CABLE, POWER, ELECTRICAL: IGNITION, HIGH-TENSION This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This speci
2、fication covers shielded and unshielded electrical power cable for use on high-tension ignition systems (see 6.1). 1.2 Classification. Cable is classified as to type of shielding, cable diameter, temperature limit, conductor material, and cable application. 1.2.1 Type designation. The type designati
3、on should include specification number-based cable configuration identifying system (see 1.3 and 6.2). Example of type designation: M 3702 U 5 L S A Cable application (see 1.2.1.6). Conductor material (see 1.2.1.5). Temperature limit (see 1.2.1.4). Cable diameter (see 1.2.1.3). Type of shielding (se
4、e 1.2.1.2 ). Specification number (see 1.2.1.1). Prefix M (see 1.2.1.1). 1.2.1.1 Specification number. The type designation will consist of the defense specification number with the prefix M. 1.2.1.2 Type of shielding. The type of shielding is identified by the letter U or S as follows: U - Unshield
5、ed S Shielded Comments, suggestions, or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAI, P.O. Box 3990, Columbus, OH 43218-3990, or email to WireCabledla.mil. Since contact information can change, you may want to verify the currency of this address information usin
6、g the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 2 1.2.1.3 Cable diameter. The cable diameter will be designated as follows: 5 - 5 millimeter (mm) nominal diameter 7 - 7 millime
7、ter (mm) nominal diameter 1.2.1.4 Upper temperature limit. The upper temperature limit will be designated in degrees Fahrenheit (F) as follows: L: Plus 250F to minus 65 F M: Plus 450F to minus 65 F H : Plus 600F to minus 65 F 1.2.1.5 Conductor material. The conductor material will be designated as f
8、ollows: C Copper: 19 strands for low and medium temperature 37 strands for high temperature S Steel: 7 strands, corrosion resistant 1.2.1.6 Cable applications. Cable applications will be designated as follows: A - Air Force aircraft B - Other than Air Force aircraft 1.3 Limitation of configurations.
9、 To simplify logistics, and unless otherwise specified (see 6.2), qualification and procurement of cable will be limited to the following configurations to which type designations have been assigned. Low temperature cable will not be procured for aircraft ignition systems. TYPE DESIGNATIONS M3702-U5
10、LSA or B M3702-S5MSA or B M3702-U5LCA or B M3702-S5MCA or B M3702-U5MSA or B M3702-S7LCA or B M3702-U5MCA or B M3702-S7MCA or B M3702-U7LCA or B M3702-S7MSA or B M3702-U7MCA or B M3702-S7HCA or B M3702-U7HCA or B 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified
11、 in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that t
12、hey must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to t
13、he extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 3 FEDERAL SPECIFICATION TT-I-735 - Isopropyl Alcohol
14、COMMERCIAL ITEM DESCRIPTION A-A-59551 - Wire, Electrical, Copper (Uninsulated) DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-5606 - Hydraulic Fluid, Petroleum Base Aircraft, Missile, and Ordnance MIL-DTL-5624 - Turbine Fuel, Aviation, Grades JP-4, and JP-5/JP-8 MIL-PRF-7808 - Lubricating Oil, Aircraf
15、t Turbine Engine, Synthetic Base MIL-PRF-11090 - Cleaning Compound, Degreasing and Depreserving Solvent MIL-PRF-23699 - Lubricating Oil, Aircraft Turbine Engines, Synthetic Base, NATO Code Number O-156 MIL-C-43616 - Cleaning Compound, Aircraft Surface MIL-E-51454 - Ethyl Alcohol (Ethanol) MIL-PRF-87
16、937 - Cleaning Compounds, Aerospace Equipment DEPARTMENT OF DEFENSE STANDARDS MIL-STD-129 - Military Marking for Shipment and Storage MIL-STD-130 - Identification Marking for U.S. Military Property (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the
17、 Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 4 2.3 Non-Government publications. The following documents form a part of this document
18、 to the extent specified herein. Unless otherwise specified, the documents are the issues of the documents cited in the solicitation or contract (see 6.2). ASTM INTERNATIONAL ASTM-A580/A580M - Steel Wire, Stainless ASTM-B33 - Wire, Tinned Soft or Annealed Copper, for Electrical Purposes ASTM-B355 -
19、Nickel-Coated Soft or Annealed Copper Wire ASTM-D3306 - Standard Specification for Glycol Base Engine Coolant for Automobile and Light-Duty Service ASTM-D1153 - Methyl Isobutyl Ketone ASTM-D471 - Rubber Property - Effect of Liquids ASTM-D4814 - Fuel, Automotive Spark-Ignition Engine ASTM-G21 - Stand
20、ard Practice for Determining Resistance of Synthetic Polymetric Materials to Fungi (Copies of these documents are available from at http:/www.astm.org or ASTM International, P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)
21、ISO 17025 - General Requirements for the Competence of Testing and Calibration Laboratories (Copies of these documents are available online at http:/www.iso.ch or from the International Organization for Standardization American National Standards Institute, 11 West 42ndStreet, 13thFloor, New York, N
22、Y 10036.) NCSL INTERNATIONAL NCSL-Z540.3 - General Requirements for Calibration of Measuring and Test Equipment (Copies of these documents are available online at http:/www.ncsli.org or from NCSL International 2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404.) Provided by IHSNot for Res
23、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 5 SAE INTERNATIONAL SAE-AS1241 - Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft SAE-AMS1424 - Deicing/Anti-Icing Fluid, Aircraft, SAE Type I SAE-J1966 - Lubricating Oil; Piston Engine (Nondispersant Mi
24、neral oil) (Copies of these documents are available online at http:/www.sae.org or from the SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this docum
25、ent and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The cables furnished under this specification shall be prod
26、ucts that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 6.3 and 4.4). 3.2 Materials. Materials shall be as specified herein and in referenced specifications and standards. Materials shall be free of defects which adversely
27、affect performance of the finished product. 3.2.1 Conductor. The conductor shall consist of either copper or steel stranded wire. 3.2.1.1 Copper strands. 3.2.1.1.1 Low, medium, and high temperature cable. The copper wire strands used in the conductors shall be soft or drawn-annealed copper conformin
28、g to A-A-59551. 3.2.1.1.2 Tin coating. The low temperature (L-designated) copper wire strands shall be coated with commercially pure tin in accordance with ASTM-B33. 3.2.1.1.3 Nickel coating. The medium and high temperature (M and H-designated) copper wire strands shall be coated with nickel in acco
29、rdance with ASTM-B355. The thickness of the coating shall be not less than 50 microinches (in.). 3.2.1.2 Steel strands. The steel wire strands used in a steel conductor shall be annealed, corrosion resistant steel wire conforming to ASTM-A580/A580M, type 302 or 304. 3.2.2 Insulation. The insulation
30、shall be non-hygroscopic, elastomeric or semi-rigid, virgin material. 3.2.3 Braid. The braid shall be glass or other non-hygroscopic, fungus-resistant material. 3.2.4 Sheath. The sheath (outer covering) shall be of non-hygroscopic, flexible, seamless, non-cracking, waterproof, slow-burning or non-fl
31、ammable, oil and fungus resistant material. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 6 3.2.5 Shielding. Unless otherwise specified (see 6.2), shielding for low temperature cable shall be tin plated copper, and for medium temperat
32、ure cable shall be silver or nickel-plated copper wire having a plate thickness of not less than 100 in. Unless otherwise specified, high temperature cable shielding shall be nickel or nickel-clad copper having a plate thickness of not less than 100 in. 3.3 Design and construction. 3.3.1 Unshielded
33、cable. The construction of unshielded cable shall be copper or steel conductor with insulation, a layer of braid, and a sheath. 3.3.2 Shielded cable. The construction of shielded cable shall add a shielding to unshielded cable as described in 3.3.1. 3.3.3 Conductor. The conductor shall be continuous
34、 throughout its length, except that individual wires may be spliced (see 3.3.3.2). The number of individual wires and the diameter of the wire in the conductor shall be specified in table I. The conductor shall be free of abrasions, kinks, and flats. Individual wires shall be free of lumps, kinks, s
35、plits, abrasions, and scraped or corroded surfaces. TABLE I. Conductor wire. Conductor material Number of strands Wire diameter inches (mm)1/ AWG 2/Min Max Copper 19 0.0111 (.28) 0.0116 (.29) 29 Copper 37 0.0111 (.28) 0.0116 (.29) 29 Steel 7 0.0126 (.32) 0.1134 (2.88) 28 1/ Dimensions are in inches.
36、 Metric equivalents are given for information only. 2/ American Wire Gage (AWG) size 3.3.3.1 Stranding. All stranding for conductors shall be left hand lay. The stranding for copper conductors shall be bunched or concentric. The stranding for steel conductors shall be concentric. When an uninsulated
37、 portion of the conductor is cut, the stranding shall not tend to unlay and the completed conductor shall not tend to spread out. 3.3.3.2 Splicing. The splicing of individual wires is acceptable provided the splicing is accomplished in such a manner that the diameter of the conductor and the perform
38、ance of the cable is not affected. The splices shall conform to the requirements of A-A-59551. 3.3.3.3 Eccentricity. The eccentricity of the conductor (at any specified cross-section) in relation to the completed cable shall not exceed 6 percent of the cable diameter when calculated by the following
39、 equation: Eccentricity, (percent) = where: X = maximum cable wall thickness, in inches Y = minimum cable wall thickness, in inches D = diameter of cable, in inches ( )DYX2100Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 7 3.3.4 Insul
40、ation. Insulation shall be applied over the entire cable length, concentric with the conductor. The insulation shall form a close fit over the conductor without adherence, and when stripped, it shall leave the conductor clean and in condition for soldering. Elastomeric insulation shall be seamless a
41、nd free of foreign material. Semi-rigid insulation shall be free of foreign material. 3.3.4.1 Wall thickness ratios. The wall thickness of the insulation (at any specific cross-section) in relation to the conductor, as calculated by the following equation shall be not greater than 12 percent: Thickn
42、ess ratio, (percent) = where: X = maximum wall thickness, in inches Y = minimum wall thickness, in inches 3.3.5 Sheath. A sheath shall be extruded over the braid. The sheath shall have a thickness of not less than 0.018 inch (.46 mm) when formed from an elastomeric material, and a thickness of not l
43、ess than 0.006 inch (.15 mm) when formed from a semi-rigid material. 3.3.6 Shielding. Shielding for shielded cable shall consist of a close and uniform woven wire applied directly over the sheath. Each carrier shall have not less than five AWG 34 wires. 3.3.6.1 Splices. Spliced wires shall average n
44、ot more than one splice per 10 feet of cable. 3.3.6.2 Coverage. The shielding shall provide not less than 85 percent coverage of the underlying sheath. Percent of coverage shall be calculated using equation the following equation: Coverage (percent) = (2F F) x 100 where: F = NDP (Cos angle of advanc
45、e)N = Number of parallel strands between successive turns of selected marker strand, plus the selected strand D = Diameter of a single strand - .0063 inch (.16mm) Angle of Advance = Angle whose tangent is P/C P = Pitch of braid measured along axis of cable C = 3.14 (Outside diameter of cable minus 2
46、D) 3.3.7 Dimensions. 3.3.7.1 Outside diameter. The outside diameter of unshielded completed cable shall be specified in table II. When portions of the cable are slightly flattened or of oval cross-section, the average of two diameters measured 90 apart at any section shall be within the specified di
47、mensions. ( )YXYX+ 100Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3702F 8 TABLE II. Outside diameter. Cable diameter designation Diameter inch (mm)1/ Nominal Actual Minimum Maximum 5 .197 (5.00) .196 (4.98) .206 (5.23) 7 .276 (7.01) .270
48、(6.86) .285 (7.24) 1/ Dimensions are in inches. Metric equivalents are given for information only. 3.3.7.2 Length. The maximum length of any piece of cable longer than 200 feet shall be determined by the size of the reel or spool with relation to convenience in handling, shipping, and storing. The d
49、rum of the reel or spool shall be not less than eight inches in diameter. Not more than 30 percent of the cable in each order shall be delivered in lengths of 50 to 200 feet, and the remaining cable shall be in lengths not less than 200 feet (see 6.2). 3.3.8 Finish. Unshielded cable shall have an even, smooth, exterio
