1、MIL-C-2621 13 m 9799906 0432235 O W 70 L- a % I ! 1. SCOPE M I L-C-8262 I (OS 1 I7 November I972 Superseding 23 November 1971 XWS-12820 (USW) ,= -. MILITARY SPECIFICATION CABLE, ELECTRIC, MISSILE, 54-CONDUCTOR This specification has been approved by the Naval Ordnance Systems Connnand, Department of
2、 the Navy 1.1 Scope. This specification covers the minimum requirements for the procurement of a synthetic rubber-jacketed cable assembly embodying 54 con- ductors. The cable assembly is used in a missile fire control system. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect
3、 on date of invitation for bids or request for proposals form a part of this specification to the extent specified herein: SPECIFICATIONS Military MIL-I- 631 MIL-C-915 MIL-Y-1140 MIL-R-6855 MIL-W- 16878 MIL-C-19787 Insulation, Electrical, Synthetic- Resin Composition, Nonrigid Cable, Electrical, Spe
4、cial Purpose; General Specification for Yarn, Cord, Sleeving, Cloth and Tap e- G1 as s Rubber, Synthetic, Sheets, Strips Molded or Extruded Shapes Wire, Electrical, Insulated, High Temperature Cable, Electrical, Torpedo, 65 Conduc- tor (for Torpedo Control Electric Set- ting) . - - OWiined Fmm - _ G
5、WML ENGINEERING DOCUMENTS - - = B 2W)S MC6iW AV and is for the purpose of determining, prior to starting production, that the manufacturers production process will produce cables that will meet the requirements of this specification. 3.2.2 Manufactured lenpth. Unless otherwise specified in the contr
6、: or order, the manufactured length shall consist of any one single leng. cable to which the impervious jacket was applied in one length. 3.2.3 Conflicting requirements. In the event of conflict between tl documents referenced herein and the contents of this specification, thc contents of this speci
7、fication shall apply. .- .- 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 MIL-C-82b21 13 m 7777906 0432237 m MIL-C-82621(OS) 3.3 Design and construction 3.3.1 Materials. All materials used in construction of the cable shall be of a quality and
8、form which will assure compliance with the require- ments of this specification and applicable drawings. 3,3.2 Conductors. All conductors shall conform to MIL-W-16878 and shall be of extruded teflon insulated in accordance with that specification. AWG 1/18 shall be Type E, 19/30 strand and wire AWG
9、1/12 shall be Type EE, 19/25 strand. The number, shielding, and size of conductors shall be as specified in Table I of this specification. The wire insulation shall be color coded as speci- fied also in Table I. Wire The stranded wire shall be of silver-plated copper. 3.3.3 Conductor assembly. Assem
10、bly of the conductors shall be in accord- ance with Table II. 3.3.4 Cable sheath. As shown in Figure 1, the sheath surrounding the conductor assembly shall be concentrically applied and shall consist of tough, resilient, abrasion-resistant polychloroprene or polyurethane. The sheath shall be homogen
11、eous in character, free from porosity, of a quality typical of best manufacturing procedures, and shall conform to MIL-R-6855, Class 2, Grade 60. In addition, the material used shall be compatible for potting and/or bonding, with the surfaces being free of residual release agents. inch and a minimum
12、 thickness of 0.80 inch. The cable sheath shall have an average minimum thickness of 0.94 3.3.5 Shielding, The conductors shall be shielded, as specified.in Table I, in accordance with MIL-W-16878, except that there shall be no jackets over the shields. conductors by a polyethylene terephthalate fil
13、m, MIL-1-631, Type G, Form F. All shields of shielded conductors are to be in intimate contact over the entire length of cable. Shields are to be isolated from their insulated nie lay shall give maximum flexibility. 3.3.6 Filler. Glass fiber filler in accordance with MIL-Y-1140 shall be used as requ
14、ired to make a compact circular cross section. 3.3.7 End seals. The end seals of the cable shall be as specified in Approved alternate seals may be used if necessary. MIL-(2-915. 3.3.8 Dimensions and tolerances. The overall dimensions of the cable and the jacket wall thicknesses shall conform to dim
15、ensions shown in Figure 1. 3.3.9 Wire splices. No wire splices, broken wires, broken strands of wire, or other discontinuities shall be permitted in a cable length. 3 .x - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-C-2b2L 13 W 777770b 0432
16、238 b FILLER EQUALLY SPACED SEE 3.3.6 SEE 3.3.4 SHEATH, SEE 3.3.4 FIGURE 1. ELECTRIC CABLE CROSS-SECTION. .4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. HIL-C-2621 13 W 979990b 0432239 W En I L-C-8262 I COS 1 3.4 Electrical requirements. The ca
17、ble shall successfully meet the fol- lowing electrical requirements: 3.4.1 Dielectric strength. All lengths of completed cable shall with- stand, without failure, a 5-second application of a 1000-volt ac test po- tential, applied to each conductor sequentially with all adjacent conduc- tors and shie
18、lds at ground potential, when tested in accordance with 4.4.3.1. 3.4.2 Insulation resistance. Each length of cable shall show an insula- tion resistance of at least 100 megohms for 1000 feet with 500 to 750 volts dc applied to each conductor sequentially with all conductors and shields at ground pot
19、ential when tested in accordance with 4.4.3.2. 3.4.3 Capacitance. The capacitance of each shielded lead in the cable with respect to its shield shall be not less than 55 mmf nor more than 90 mmf per foot, when measured at a frequency of 1 kiloHertz (kHz) r-20 Hz and tested in accordance with 4.4.3.3
20、. 3.5 Mechanical requirements. following mechanical requirements: The cable shall be capable of meeting the 3.5.1 Cold temperature bend. The cable sheath, conductor insulation, and conductors shall show no evidence of failure when the completed cable is sub- jected to the cold temperature 90-degree
21、bend test of 4.4.4.1. 3.5.2 Cable strength. The cable sheath, conductor insulation, and con- ductors shall show no evidence of failure when the cable is tested in ac- cordance with 4.4.4.2. 3.5.3 Torsion, The cable sheath, conductor insulation, and conductors shall show no evidence of failure when t
22、he completed cable is tested in accordance with 4.4.4.3. 3.6 Environmental requirements. The cable shall be capable of meeting the other requirements of this specification after being subjected to the following en;ironmental conditions : 3.6.1 Salt water immersion. The cable sheath, conductor insula
23、tion, and conductors shall show no evidence of failure when the completed cable is tested in accordance with 4.4.5.1. 3.6.2 Temperature and humidity. The cable sheath, conductor insulation, and conductors shall show no evidence of failure when the completed cable is tested in accordance with 4.4.5.2
24、, 3.6.3 Temperature and humidity (storage mode). The cable sheath, con- ductor. insulation, and conductors shall show no evidence of failure when the completed cable is tested in accordance with 4.4.5.3. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
25、,-,-9. NUMBER 1 2 3 4 5 6 7 c TABLE I M I L-C-8262 I (OS 1 REQUIREMENTS Shielded Shielded 2/C Shielded .& Twisted 2/C Shielded & Twisted 2/12 Shielded CONDUCTOR CONDUCTOR I SHIELDING TRACER TRACER None 3/C Twisted & Shielded None 6 8 9 10 11 12 13 14 15 16 17 18 19 20 n.8 37 18 & Twisted Shielded Sh
26、ielded 2/C Shielded & Twisted A Y 2/C Twisted & Shielded 3lC Twisted & Shielded None Black Brown Red Orange Yellow Brown Red Orange Yellow Green Blue Violet Gray Black- 2 Black Brown Red Orange Yellow Green Blue Violet Gray Black-2 Black Brown Red Oranne Yellow Green Blue Violet Gray B1 ack- 2 Black
27、 Brown Red Orange Yellow Green Blue Violet Gray Black- 2 Black Brown Red Orange Yellow AWG NO. 18 44 45 46 47 48 49 50 51 52 53 54 12 4/Cond. With Filler for Circular Sec, 6 Shielded BASE COLOR Black Brown Red Orange Yellow Green Blue Violet Gray White OLOR CODE WIDE I NARROW Provided by IHSNot for
28、ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-C-8262 I (OS 1 r LAYER CONDUCTORS SEQUENCE LENGTH OF LAY Core . Filler * - Ist Layer 4 2nd Layer 24 (51, 52, 53, 54) Max 3.5 in. L.H. 1, (19, 20, 21)Y 2, Max 8.0 in.R.H. (22, 23, 24), (3, 41, (5, 61, (7, 81, 9, 10, (11,
29、U), (13, 14), (15, 16), (17, 181 25 thru 50 Max 9.0 in. L.H. 3rd Layer 26 TABLE II - CONDUCTOR ASSEMBLY 3.6.4 Tropical environment. The cable sheath, conductor insulation, and conductors shall show no evidence of failure when the completed cable is tested in accordance with 4.4.5.4. 3.7 Workmanship.
30、 The workmanship shall be first-class in every respect The stand- and uniform throughout each lot of cable offered for delivery. ards of workmanship exhibited in any approved preproduction sample, subject to any qualification stated in the Governments notice of approval, shall be determinative of th
31、e requirements of the contract relative to workman- ship insofar as not specifically covered by applicable specifications. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance
32、of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection require- ments specified herein, unless disapproved by the Government. he Govern- ment reser
33、ves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure sup- plies and services conform to prescribed requirements. 4.2 Samplinq 4.2.1 M. A lot shall be defined as follows, based on footage ordered: Order Up to 10,000 feet
34、10,000 to 50,000 feet Over 50,000 feet Lot Total order 10,000 feet 25,000 feet - 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-C-2621 13 W 7777706 0432.242 W I 4.2.2 Number of samples 4.2.2.1 Preproduction. Unless otherwise specified herein
35、 or in the con- tract or order (see 6.2), a 100-foot preproduction sample of cable shall be supplied by the contractor. same procedures and methods and at the same plant location proposed by con- tractor for the execution of the contract. the procuring activity for purposes of determining compliance
36、 with the re- quirements of the contract or order and the applicable specifications. ther production of the item by the contractor prior to approval of the pro- curing activity or completion of inspection and tests on the preproduction sample shall be at the contractors risk. will become the propert
37、y of the procuring activity and will be included in the quantity of cable called for in the contract or order. The cable shall be manufactured using the The sample shall be submitted to Fur- Accepted preproduction sampies 4.2.2.2 Lot acceptance. tract or order (see 6.2), sampling for lot acceptance
38、shall be conducted in accordance with MIL-C-915. Un1es.s otherwise specified herein or in the con- 4.3 Inspection and tests 4.3.1 Test conditions. Unless otherwise specified, tests and examinations Any specified condition shall not affect 1 required by this specification shall be conducted under any
39、 combination of conditions within the ranges below. the other two ambient ranges. (a) Temperature: 20 degrees C to 30 degrees C. a (b) Relative Humidity: Room ambient to 95 percent. (c) Barometric Pressure: 24 to 31 inches of mercury. 4.3.2 Preproduction testing and lot acceptance testing. Preproduc
40、tion testing and lot acceptance testing shall consist of the inspection and tests shown in Table III on the samples selected under 4.2.2.1 and 4.2.2.2. 4.3.3 Preproduction test waiver. If a contractor has previously produced and delivered cable in accordance with the requirements of this specificati
41、on and his product has proven satisfactory, and if no change has been made in the specifications or methods of manufacture since the original test, prepro- duction tests for subsequent contracts or orders will be required only if specified in the contract by the procuring activity. 4.3.4 Action in c
42、ase of failure 4.3.4.1 Preproduction sample In case of failure in any preproduction sample, the cause shall be determined and corrected. A statement of the 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.I MIL-C-82621 13 9999906 0432243 T W failur
43、e and proposed corrective action shall be submitted to the procuring activity for approval before additional tests are conducted. TABLE III - PREPRODUCTION AND LOT ACCEPTANCE TESTS Type Test Prep rod /Ac cep tance Preproduction Preprod/ Accep tance Prep rod/ Accep tance Preprod :tion Test Title Visu
44、al and Dimension- al Examination Cable Sheath Dielectric Strength Insulation Resist- ance Capacitance Cold Temperature Bend Cable Strength Torsion Salt Water Immersion Temperature and Humid it y Temperature and Humidity (storage mode) Tropical Environment Requirement 4.3.4.2 Lot acceptance sample. I
45、n case of failure in lot acceptance. tests, the cause shall be determined and a statement of the failure and pro- posed corrective action shall be submitted to the procuring activity for consideration and approval. out the approval of the procuring activity. No subsequent testing shall be conducted
46、with- If corrective action is approved, the lot is to be subjected to all ac- ceptance tests of 4.3.2 unless repetition of tests which have already been conducted is waived by the proeuring activity. If corrective action is not 3.2, 3.3 3.7 3.3.4 3.4.1 3.4.2 3.4.3 3.5.1 3.5.2 3.5.3 3.6.1 3.6.2 3.6.3
47、 3.6.4 Method 4.4.1.1 4.4.2.1 4,4.3.1 4.4.3.2 4.4.3.3 4.4.4.1 4.4.4.2 4.4.4.3 4.4.5.1 4.4.5.2 4.4.5.3 4.4.5.4 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_.- _ MIL-C-82b21 13 7777906 0432244 1 z MI L-C-8262 I (OS 1 approved, the lot shall be re
48、jected. ject to retest and subsequent acceptance at the discretion of the procuring activity. Portions of a rejected lot may be sub- 4.4 Test methods 4.4.1 General. The methods employed for testing component materials and cable performance shall be as specified in MIL-C-19787, except as modifed or s
49、upplemented herein. 4.4.1.1 Visual and dimensional inspection. The sample length of cable selected under 4.2.2 shall be examined visually and dimensionally for com- pliance with the requirements of this specification and other applicable specifications. In addition, each manufactured length of cable shall be examined visually for surface flaws such as pin holes and pushbacks in the sheath and shall be cu
