1、MIL-c- 19787 (os) mEc-19787NWeP) 29 July 1969 Supers edi ng 14 March i960 MILITARY SPECFICATION CA=, ELECTRIC, TORVEDO, 65 CONDUCTOR (FOR TRPEDO CONTXOL, EIECTRIC SETPING) This specification has been approved by the Naval Ordnance Systems Comnd, Department of the Navy 1. SCOPE 1.1 This specification
2、 covers the requirements for the procurement, manufacture, inspection, and testing of 65-conductor electric cables. The cables are distinguished by their miniature size, type of insulation, features of construction, and the general conditions of their service use. 1.2 Classification. The cables shal
3、l be of the following types, as specified (see 6.1): (a) Type MSW 65-onductor, Plain, Extra Thin Wall (b) Typ bSTcP 65-onductor, Plain, Thin Wail 2. AFFLICABIX DOCUMENTS 2.1 The following documents of issue in effect on the date of invita- tion for bids or request for proposals form a part of this s
4、pecification to the extent specified herein. SPECIFICATIONS FEDERAL QQ-W- 00343 Wire, Electrical, Uninsulated Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-L7787C bL W 77777Ob 0087823 O i MILITARY MIG C- 572 MIL- r 15 016 MIL- C-l2000 Cords,
5、 Yarns and Monofilements-Organic Synthetic Fiber fiubricating Oil, General Fwtpse Cable, Cord, and Wire, Electric; Packaging of SpArnRDS FEDERAL Fed Test Method Std Cable and Wire, insulated; Methods of 80. 228 Testing MCLSTD- i05 Sampling Procedures and Tables for Inspection by Attributes MILSTD- T
6、est Reports, Preparation of (Copies of specifications and standards required by contractors in connection with specific procurement functions should be obtained from th procuring activity or as directed by the contracting officer. ) Electric cables covered by this specification am minimum diameter c
7、ables having a tough abrasion-resisting polychloroprene sheath. The cables are designed to be compat.ible with special type electrical connectors and therefore must be of unifom cross-sectional area and compactness throughout the manufactured length. 3.1.1 MSTCP-65,25 psi minimum. 3.8.11 Minimum sta
8、ndards . The requirementc specified herein for each component material and for the completed cable assembly constitute the minimum acceptable standards for quality and performance under tests. 3.8.12 WorkmanshiE. The finished cable, including all components, shall be first class in workmanship and s
9、hall be constructed and finished in a manner to assure compliance with a11 requirements of this specifi- cation. area and compactness throughout the manufactured length. The standards of workmanship exhibited in any approved preproduction sample, subject to any qualification stated in the Government
10、s notice of approval, shall be determinative of the requirements of the contract relative to workman- ship insofar as not specifically covered by applicable specifications. Particular attention shall be paid to unifomnity of cross-sectional 4 . QUALITY ASSURANCE PROVISIONS 4 .i Responsibility for in
11、spection. Unless otherwise specif ied in the contract or purchase order, the supplier is responsible for the perfom- ance of all inspection requirements as specified herein. otherwise specified in the contract or order, the supplier may use his Except as 8 Provided by IHSNot for ResaleNo reproductio
12、n or networking permitted without license from IHS-,-,-MI-C-19787( OS) own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the
13、specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Sampling 4.2,1 - Lot. A lot shall be defined as follows, based upon footage ordered : Order - Up to 10,000 feet O,OO to SO,OOO feet Over 50,000 feet Lot Size Total Order
14、10,000 feet 25,000 feet 4.2.1.1 Unit of inspection. The unit of inspection for the determina- tion of sample size shall be one inspection length. (An inspection length is defined as one manufactured, completed cable of one type offered to the inspector for acceptance. ) 4.2.2 Number of samples 4.2.2
15、.1 First article sample. When required (see 3.2), one first article sample of 100 feet of each type of cable being procured shall be supplied by the contractor. Samples accepted will be applied as part of the quantity specified in the contract or order. submitted for first article testing at an acti
16、vity designated in the con- tract or order or by the Naval Ordnance Systems Command. duction of cable prior to report of satisfactory compliance to specified requirements or approval by the contracting activity shall be at the con- tractors risk. The sample shall be Further pro- 4.2.2.2 Quality conf
17、ormance sample. 4.3 Inspection The saapling plan and tests to be performed shall be as designated in the applicable test paragraph. 4 . 3 . 1 Classification of inspection . The examination and testing of cables covered by this specification shall be classified as follows: 4.3.1.1 First article. Firs
18、t article inspection to determine com- pliance with minimum requirements shall be in accordance with 4.4.2 through 4.4.11. 4 . 3.1.2 Quality conformance . Quality conf ormce inspection to deter- mine acceptability of the lot as defined in 4.2.1 shall consist of the tests or inspections of 4.4.2 thro
19、ugh 4.4.11. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ fl1 L- C - 19 7 B 7 C b l-T?m * MIL-C-C(OS) e 4.3.2 Examinations and tests (a) Visual and dimensional (4.4.2) (b) Copper conductor (4.4.3) (c) Conductor insulation (4.4.4) (d) Cable she
20、athing (4.4.5) (e) (f) Continuity (4.4.7) (g) Capacitance (4.4.8) (h) Room temperature bend (4.4.9) (i) Cold temperature bend (4.4.10) (j) Hydrostatic (4.4.11) Dielectric strength and insulation resistance of cable (4.4.6) 4.3.3 Action in case of failure 4.3.3.1 First article sanple. 6 In the event
21、of the failure of a first article sample to comply with any of the test requirements in accordance with the associated acceptance criteria, the sample under consideration shall be rejected. However, if a test failure occurs as a result of an invalid testing procedure, the original test shall be disc
22、ounted and an additional test shall be conducted in order to determine disposition of the first article sample, Such a rejection shall require that the man- ufacturer review and revise his process procedures and with the approval of the procuring activity submit another first article sample. e 4.3.3
23、.2 Quality conformance sample. In the event of the failure of However, in the event any test sample to comply with the acceptance criteria of 4.3.2 (a), (e), and (f), the lot represented shall be rejected. of the failure of any quality conformance test sample to comply with the acceptance criteria o
24、f 4.3.2 (b), (c), (a), (g), (h), (i), and (j), additional tests shall be run in duplicate on samples from the same cable length. If both additional tests are satisfactory, the lot shall be acceptable. If any failure occurs on the additional tests, the lot shall be rejected, If a test failure occurs
25、as the result of an invalid testing procedure, the original test shall be discounted and an additional test shall be conducted in order to determine lot disposition. manufacturer shall have the option of subjecting each Length of completed The Provided by IHSNot for ResaleNo reproduction or networki
26、ng permitted without license from IHS-,-,-MIEc-ig7C(OS) cable in a rejected lot to the tests prescribed in 4.3.2 wherein failure occurred and, after removing all defective lengths of cable, resubmit the lot for Government acceptance. than specified below: In no case will cable lengths be less For C
27、cable) For B cable) Length (Ft. Minim). 30 150 30 *Minimum length shall be as specified in the contract or order. 4.4 Inspection procedures 4,4.i General. Methods employed for testing component materials and cable performance shall be as specified herein. tion and cable sheath shall be as specified
28、inFED-STD-228, except as modified herein. Tests for conductor insula- 4.4.2 Visual and dimensional inspection. Each lot of cable submitted for Government inspection shall be visually and dimensionally examined externally for compliance with the requirements of this specification. The sample size and
29、 acceptance criteria for this inspection shall be determined in accordance with MIL-STD-105, AQL 1.0 percent defective. The Government shall, in its sole discretion, determine whether to use normal, tightened, or reduced inspection at the start of a contract. each sample shall be checked for diamete
30、r, jacket wall, number and size of conductors, and color coding. Determination of lot size for this test shall be based on the number of inspection lengths as defined in 4.2.1.1. In addition, the manufacturer shall, during manufacture, examine each length of cable for surface flaws, pinholes, or pus
31、hbacks in the sheath and shall cut at any such defects. One end of 4.4,2,1 Conductor lax. Upon completion of the test outlined in 4.4.11, the conductor lay shallbe inspected for conformance with 3.1.2.2. 4.4 . 3 Copper conductor. Specimens taken from samples selected under 4.4.2 which have not been
32、damged shall be tested for conformance with 3.8.3. 4.4.4 Conductor insulation. Sample specimens consisting of sufficient length of completed cable shall be selected from each lot for subjection to this test. be determined in accordance with ML-STD-lO5, Inspection Level S-l. The entire lot shall be r
33、ejected if one or more defective units are found in the sample. The sample size and acceptance criteria for this test shall The Government shall, in its sole discretion, determine 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-i9787( OS) f
34、whether to use normal, tightened, or reduced inspection at the start of a contract. The minim sample size shall consist of five sample spec- imens. 4.2.1.1) is less than five, one sample specimen shall be taken from each. Three conductors shall be randomly selected from each sample specimen for phys
35、ical testing of the conductor insulation in order to evaluate. compliance with the requirements of 3.8.4.1 through 3.8,4.4. Sheath specimens shall be taken from each of the cable samples chosen for insulation testing for physical tests to deter- mine compliance with the requirement s of 3.8 * 6 * 1
36、through 3.8 # 6 . 5. However, if the number of inspection lengths (as defhed n 4.4.5 Cable sheath. 4.4.6 Dielectric strength and insulation resistance of cable. The completed cable shall be tested dry, without immersion in water, to determine conformance to 3.8.7. with Table Vi, Major B. Sample plan
37、 usd shall be in accordance 4.4.7 Continuity test. When specified, the continuity test shall be accomplished by taking dc resistance readings on each conductor. sistance shall not exceed the fallowing values: The re- Conductor AWG Size 24 22 20 19 18 16 Ohms per 1000 ft of Completed Cable 28.5 i8. 1
38、1.5 8.9 1:; Sample plan used shall be in accordance with Table VI, Bhjor A. 4.4.8 Capacitance, A sample, composed of one test specimen from each production lot and prepared in accoFdance with 4.4.8.i (a) through (a), shall be tested to determine conformance with 3.8,8. technique used shall give repr
39、oducible results to three significant figures . The measurement 4.4,8. Preparation for tests, (see Figure 3) Prepare a 20 foot minimum length of cable as follows: (a) (b) Strip back cable sheathing i$ inches to 2 inches on each end of sample required for connections. Com3 out shielding on the 7 shie
40、lded conductors back near the sheathing. 12 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-L787C 61 m b O4190bh 4 m - - - MIL-c- 19787c (os) (c) Strip insulation from each shielded conductor approximately 3 inch. (a) For computation purpose
41、s, the length of cable shall be considered . as the distance between the undisturbed ends of shielding (“L“ in Figure 3) 4.4.9 Room temperature 90 degree bend test. Cable specimens of con- venient length shall be randomly selected from the material under con- sideration in order to determine conform
42、ance with the 90 degree bend test requirement of 3.8.9. criteria shall be determined in accordance with MIL-STD-105,Inspection Level S-l,AQL 4. defective. normal inspection reinstated in accordance with MIL-STD-105. The test shall be performed on suitable bend test equipment at room temperature with
43、 8 weight suspended from the free end of the cable. The mount of weight shall be as follows: The sample size (number of specimens) and acceptance Reduced inspection may be instituted and (a) MSW-65: 16 pounds (b) Tcp-65: 28 pounds Frequency of bending shall be fmm I2 to 1s complete cycles per minute
44、. Bending shall be confined to one section of the cable, held by a beveled guider, which shall bend the cable 90 degrees vertically in opposite directions during one cycle. The size of the beveled guider shall be as follows : (a) MSTCIF-65: 1 inch inside diameter (b) MSTCP-65: 13 inch inside diamete
45、r Cable bending diameter shall be approximately four times the cable dia- meter. Conductors and shields shall be connected electrically so that any conductor breaks will stop the mechanism. Samples shall withstan6 the following number of full cycles without breaks or sheath rupture: (a) MSTCIF-65: 2
46、0 cycles (b) MSTCP-65: 10 cycles After bend testing, the sample shall be checked for continuity to deter- mine evidence of shorts between adjacent conductors or between conductor and shieds. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. flIL-C-17
47、7F7C b -?4477b 0419067 b W- MIL- C- 19787 (OS) 4.4.10 Cold temperature i80 degree bend test. Cable specimens of convenient length shall be randomly selected from the material under consideration in order to determine conformance to the i80 degree bend test requirement of 3.8.9. acceptance criteria s
48、hall be determined in accordance with MIL-STD-105, Inspection Level S-1, AQL 4.0 percent defective. instituted and normal inspection reinstated in accordance with MIL-STD- 105. diameter shall be conditioned for 24 hours at -40 degrees F. Specimens and mandrel shall be removed from chamber and the.18
49、0 degree bend test shall be pexfomed manually within one minute of removal. shall be bent around the mandrel at a rate of approximately 20 degrees per second. splitting and conductors shall be tested for continuity. The sample size (number of specimens) and Reduced inspection may be The specimens and a mandrel of approximately 4 times the cable The cable Jacket and insulation shall be insp
