1、Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandardsnavy.mil, with the subject line “Document Comment”. Since contact
2、information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 6145 INCH-POUND MIL-DTL-24640C 8 November 2011 SUPERSEDING MIL-DTL-24640B 22 August 2002 DETAIL SPECIFICATION CABLES, LIGHTWEIGHT, LOW
3、SMOKE, ELECTRIC, FOR SHIPBOARD USE, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers lightweight, low smoke, electric cables for Navy shipboard applications. These cables are n
4、ot meant to be exposed to or submerged in fresh, potable, seawater, or saltwater. 1.2 Classification. Cables covered by this specification should be classified as watertight, watertight with circuit integrity, and non-watertight constructions, with or without overall shields and further classified f
5、or flexing and non-flexing service for low power, lighting, control, communications, instrumentation and electronic applications (see supplement). A part or identifying number for cable should be as specified in 1.3 and the applicable specification sheet. 1.3 Part or identifying number (PIN). The pa
6、rt number should be a combination of numbers and letters in accordance with the following: M 24640 /XX -XX A or U O or D or N Prefix Specification number Slant Sheet Number See Specification Sheets A = Armored U = Unarmored or blank O = Overall shielded D = Double overall shielded N = Not shielded o
7、r blank 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified 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 ef
8、fort has been made to ensure the completeness of this list, document users are cautioned that they 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 hand
9、books. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-228 - Cable and Wire, Insulated; Methods of
10、Testing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24640C 2 DEPARTMENT OF DEFENSE SPECIFICATIONS (See supplement 1 for list of specification sheets.) MIL-I-631 - Insulation, Electrical, Synthetic-Resin Composition, Nonrigid MIL-DTL-5624
11、- Turbine Fuel, Aviation, Grades JP-4 and JP-5 MIL-DTL-16884 - Fuel, Naval Distillate MIL-PRF-17331 - Lubricating Oil, Steam Turbine and Gear, Moderate Service MIL-PRF-17672 - Hydraulic Fluid, Petroleum, Inhibited MIL-PRF-23699 - Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Nu
12、mber O-156 MIL-DTL-81381 - Wire, Electric, Polyimide-Insulated, Copper or Copper Alloy MIL-PRF-83282 - Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Metric, NATO Code Number H-537 MIL-PRF-87257 - Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft an
13、d Missile DEPARTMENT OF DEFENSE STANDARDS MIL-STD-104 - Limits for Electrical Insulation Color (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or https:/assist.daps.dla.mil.) 2.3 Non-Government publications. The following documents form a part of this docum
14、ent to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN NATIONAL STANDARDS INSTITUE (ANSI) ANSI B46.1 - Surface Texture (Surface Roughness, Waviness, and Lay) (Copies of this document are available from t
15、he American National Standards Institute, 25 W. 43rd St, 4th Floor, New York, NY 10036 or online at http:/webstore.ansi.org/.) ASTM INTERNATIONAL ASTM B3 - Standard Specification for Soft or Annealed Copper Wire ASTM B8 - Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Me
16、dium-Hard, or Soft ASTM B33 - Standard Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical Purposes ASTM B193 - Standard Test Method for Resistivity of Electrical Conductor Materials ASTM B258 - Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of A
17、WG Sizes of Solid Round Wires Used as Electrical Conductors ASTM B286 - Standard Specification for Copper Conductors for Use in Hookup Wire for Electronic Equipment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24640C 3 ASTM D470 - Standard
18、 Test Methods for Crosslinked Insulations and Jackets for Wire and Cable ASTM D770 - Standard Specification for Isopropyl Alcohol ASTM D1141 - Standard Practice for the Preparation of Substitute Ocean Water ASTM D2240 - Standard Test Method for Rubber Property - Durometer Hardness ASTM D5213 - Stand
19、ard Specification for Polymeric Resin Film for Electrical Insulation and Dielectric Applications ASTM G21 - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi (Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., P.O. Box C700, Wes
20、t Conshohocken, PA 19428-2959 or online at www.astm.org.) DEFENCE STANDARDS (DEF STAN) DEF STAN 02-711 - Determination of the Smoke Index of the Products of Combustion from Small Specimens of Materials, Issue 2 (1/1981) DEF STAN 02-713 - Determination of the Toxicity Index of the Products of Combust
21、ion from Small Specimens of Material, Issue 3 (3/1985) (Copies of these documents are available from the Procurement Executive, Ministry of Defence, Ship Department, Section TE112, Block G, Foxhill, Bath 5AB England.) INSULATED CABLE ENGINEERS ASSOCIATION (ICEA) ICEA T-28-562 - Test Method for Measu
22、rement of Hot Creep of Polymeric Insulation (Copies of this document are available from Insulated Cables Engineers Association, P.O. Box 440, South Yarmouth, MA 02664 or online at .) NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) NEMA WC 26 - Binational Wire and Cable Packaging Standard NEMA W
23、C 61 - Transfer Impedance Testing NEMA WC 27500 - Standard for Aerospace and Industrial Electrical Cable (Copies of these documents are available from the National Electrical Manufacturers Association, 1300 North 17thStreet, Suite 1847, Rosslyn, VA 22209 or online at www.nema.org.) SAE INTERNATIONAL
24、 SAE-AS81044 - Wire, Electrical, Crosslinked Polyalkene, Crosslinked Alkane-Imide Polymer, or Polyarylene Insulated, Copper or Copper Alloy SAE-AS81044/9 Wire, Electric, Crosslinked Polyalkene Insulated, Tin-Coated Copper, Medium Weight, 600-Volt, 150 C SAE-AS81044/12 - Wire, Electric, Crosslinked P
25、olyalkene Insulated, Tin-Coated Copper, Light-Weight, 600-Volt, 150 C (Copies of these documents are available from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or online at www.sae.org.) Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
26、e from IHS-,-,-MIL-DTL-24640C 4 UNDERWRITERS LABORATORES INC. (UL) UL 1581 - Reference Standard for Electrical Wires, Cables, and Flexible Cords UL 1685 Standard for Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables (Copies of these documents are available
27、 from COMM 2000, 1414 Brook Drive, Downers Grove, IL 60515 or online at .) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of th
28、is document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable spe
29、cification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. 3.2 Qualification. Cables furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applica
30、ble qualified products list before contract award (see 4.3 and 6.5). 3.3 Materials. Materials used in construction of those cables furnished under this specification shall be in accordance with the requirements shown in the applicable specification sheets and as follows. 3.3.1 Conductors. Conductor
31、material shall be copper and shall be as specified in 3.3.1.1 through 3.3.1.3. 3.3.1.1 Uncoated copper. Copper conductors shall be soft or annealed in accordance with ASTM B3. 3.3.1.2 Coated conductor. Coated copper conductors shall be tinned in accordance with ASTM B33. 3.3.1.3 Conductor stranding.
32、 The size and quantity of individual conductor strands shall be in accordance with ASTM B8 or ASTM B286 as specified in the specification sheet. Strands shall be free from lumps, kinks, splits, scraped or corroded surfaces, and skin impurities. 3.3.2 Insulation. Insulation shall be in accordance wit
33、h MIL-DTL-81381, SAE-AS81044/9, or SAE-AS81044/12 as specified in the applicable specification sheet. All physical and electrical properties shall be as specified by the specification sheet. 3.3.3 Jackets. The material used for the cable jacket shall be crosslinked polyolefin which shall have the ph
34、ysical and electrical properties as required by the applicable specification sheet and as specified herein. The color of the cable jacket shall be black or white, as specified (see 6.2). 3.3.4 Shields. Conformance to the materials, constructions, and coverage for shields of insulated conductors, gro
35、ups of insulated conductors, and overall cable and cord shall be as specified in the specification sheet. When AWG sizes are specified for wire shields, they shall be in accordance with ASTM B258. 3.3.5 Fillers. Unless otherwise specified in the applicable specification sheet, fillers for cables int
36、ended for flexing applications, only fibrous or paper fillers shall be used. For non-flexing types, solid or fibrous filler materials shall be acceptable. 3.3.5.1 Fibrous or paper fillers. Fibrous and paper fillers shall be treated for flame or moisture resistance, or a combination of both, to meet
37、the requirements for the particular type of cable. 3.3.5.2 Nonfibrous fillers (solids). Nonfibrous fillers shall consist of elastomeric material which is removable from insulation of conductors and insulating coverings over the shields. The acceptability of the material shall be in accordance with 4
38、.7.2 and 4.7.3. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24640C 5 3.3.5.3 Water-blocking filler materials (watertight). Water-blocking materials used in cable and shield interstices shall be compatible with all other cable materials. T
39、he materials shall be clean, non-tacky to the touch, and shall leave no residue on the installers hands. The materials shall be free stripping from the cable components and shield by hand and shall not require the use of chemicals or other mechanical means of removal. The materials shall not interfe
40、re with any termination technique used with finished cable, shields, or components. The compatibility of the materials shall be in accordance with 4.7.2 and 4.7.3. 3.3.5.4 Water-swelling fillers (watertight). Water-swelling fillers used to water-block cable voids and shield interstices shall be comp
41、atible with all other cable materials in accordance with 4.7.2 and 4.7.3. The fillers shall be clean and non-tacky to the touch. They shall be readily removable from the cable components and shields. The fillers shall not interfere with any termination technique used with finished cable, shields, or
42、 components. Cables manufactured with these types of fillers shall be tested for water-tightness with seawater in accordance with ASTM D1141, and shall pass the limits for allowable water-leakage. 3.3.6 Tapes. Tapes shall be of a material compatible with the other cable materials in accordance with
43、4.7.2 and 4.7.3. Polyester tapes shall be Type G in accordance with MIL-I-631, and polyimide tapes shall be in accordance with ASTM D5213. Tapes applied over shield braids for singles, twisted pairs, and triads, shall be sealed or set to prevent unwinding freely, but shall be easily removable for wi
44、re and/or shield termination. 3.3.6.1 Water-swelling tapes (watertight). Water-swelling tapes used to water-block cable voids and shield interstices shall be compatible with all other cable materials in accordance with 4.7.2 and 4.7.3. The tapes shall be clean and non-tacky to the touch. They shall
45、be readily removable from the cable components and shields. The tapes shall not interfere with any termination technique used with finished cable, shields, or components. Cables, manufactured with these types of tapes must be tested for water-tightness with seawater in accordance with ASTM D1141, an
46、d shall pass the limits for allowable water-leakage. 3.3.7 Separators. Separators may be used at manufacturers option where required to meet insulation removability requirements and shall be of a material that is compatible with other cable materials. The compatibility of the material shall be in ac
47、cordance with 4.7.2 and 4.7.3. 3.3.8 Binders. Binders shall be of a material compatible with the other cable materials. The compatibility of the material shall be in accordance with 4.7.2. 3.3.9 Fungus resistance. All nonmetallic materials shall be fungus inert and shall be certified that they meet
48、the requirements of ASTM G21 with a growth rate of 1 or less. 3.3.10 Armor wires. The armor wires shall consist of Alclad 5056 or 5154 aluminum alloy having a diameter of 0.01260.0005 inch with a minimum tensile strength of 50,000 pounds per square inch (lb/in2) and a minimum elongation (before appl
49、ication to the cable) of 2 percent in 10-inch length. 3.3.11 Hazardous items and toxic materials. The material shall have no adverse effect on the health of personnel when used for its intended purpose. Questions pertinent to this effect shall be referred by the contracting activity to the appropriate departmental medical service who will act as an advisor to the contracting agency. Regardless of any other requirements, materials and parts containi
