1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA WC 55021-2013Standard for Military Internal Electrical CableANSI/NEMA WC 55021-2013 ANSI/NEMA WC 55021-2013 Standard for Military Internal Electrical Cable Published by National Electrical Manufacturers Association 1300
2、 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org Copyright 2013 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Ar
3、tistic Works, and the International and Pan American Copyright Conventions. 2013 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the documen
4、t at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained h
5、erein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes rules to promote fa
6、irness in the development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any per
7、sonal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, expressed or impli
8、ed, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or sellers
9、products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone e
10、lse. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may b
11、e available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, desig
12、ns, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. WC 55021-2013 Page i 201
13、3 National Electrical Manufacturers Association FOREWORD In the preparation of this standards publication input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the concerned NEMA product Subdivisio
14、n by contacting the: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 This standards publication was developed by the NEMA High Performance Wire and Cable Section. Section approval of the standard does not n
15、ecessarily imply that all section members voted for its approval or participated in its development. At the time it was approved, the section was composed of the following members: AFC Cable Systems New Bedford, MA Apical Division, Kaneka North America Pasadena, TX Belden Inc. St. Louis, MO Berk-Tek
16、 a Nexans Company Elm City, NC Cable USA LLC. Champlain Cable Corporation Naples, FL Colchester, VT Coleman Cable Inc. Comtran Cable LLC Electrolock, Inc. Freeport McMoRan Copper SC = Silver Coated Copper, 19 Strands 905 = 1st wire white base color, black first stripe, green second stripe; 904 = 2nd
17、 wire white base color, black first stripe, yellow second stripe; 903 = 3rd wire white base color, black first stripe, orange second stripe; WC 55021-2013 Page 4 2013 National Electrical Manufacturers Association 902 = 4th wire white base color, black first stripe, red second stripe; 901 = 5th wire
18、white base color, black first stripe, brown second stripe; S = Overall silver coated copper shield 09 = FEP jacket 2.2.1 Basic Wire Type The wire type is identified by a letter symbol as identified in the individual HP specifications and as shown in Table 2-1. All wire in the cable shall be the same
19、 type. TABLE 2-1 TYPE OF WIRE SYMBOL TYPE WIRE SPECIFICATION Temperature rating B NEMA HP 7 (PVC) * -40C to 105C (TPC) BN NEMA HP 7 (PVC/POLYAMIDE) * -40C to 105C (TPC) C NEMA HP 7 (PVC) * -40C to 105C (TPC) CN NEMA HP 7 (PVC/POLYAMIDE)* -40C to 105C (TPC) D NEMA HP 7 (PVC)* -40C to 105C (TPC) DN NE
20、MA HP 7 (PVC/POLYAMIDE)* -40C to 105C (TPC) E NEMA HP 3 (PTFE) -65C to 200C (SPC) / 260C (NPC) EE NEMA HP 3 (PTFE) -65C to 200C (SPC) / 260C (NPC) J NEMA HP 7 (PE) -40C to 75C (TPC) K NEMA HP 4 (FEP) -65C to 200C (SPC) KK NEMA HP 4 (FEP) -65C to 200C (SPC) L NEMA HP 5 (XLPE) -65C to 125C (TPC) LL NE
21、MA HP 5 (XLPE) -65C to 125C (TPC) LS NEMA HP 8 (XLPO) -65C to 125C (TPC) LX NEMA HP 5 (XLPE) -65C to 125C (TPC) S NEMA HP 6 (SILICONE) -65C to 150C (TPC) 200C (SPC) SS NEMA HP 6 (SILICONE) -65C to 150C (TPC) 200C (SPC) SSB NEMA HP 6 (SILICONE/GLASS) -65C to 150C (TPC) 200C (SPC) ZH NEMA HP 8 (ZH-POL
22、YOLEFIN) -65C to 125C (TPC) ZHDM NEMA HP 8 (ZH-POLYOLEFIN) -65C to 125C (TPC) ZHDH NEMA HP 8 (ZH-POLYOLEFIN) -65C to 125C (TPC) ZHS NEMA HP 6 (ZH-SILICONE) -65C to 150C (TPC) 200C (SPC) ZHSS NEMA HP 6 (ZH SILICONE) -65C to 150C (TPC) 200C (SPC) ZHX NEMA HP 8 (POLYOLEFIN) -65C to 125C (TPC) *Notes: P
23、VC insulated wire is not to be used for aerospace applications. 2.2.2 Conductor Size The conductor size is identified by the AWG size. All conductors in the cable shall be of the same size. WC 55021-2013 Page 5 2013 National Electrical Manufacturers Association 2.2.3 Conductor Material and Stranding
24、 The conductor material shall be identified by a letter symbol as specified in Table 2-2. All wire in the cable shall be the same material and stranding. (See basic wire spec for available strandings). TABLE 2-2 CONDUCTOR MATERIAL Letter Symbol Type Conductor Material and Stranding Type Maximum Temp
25、erature Limit for Shield Material (Information only) NC Nickel Coated Copper Standard Stranding (Table 2-3A) 260C NS Nickel Coated Copper Clad Steel (Table 2-3A) 260C NH Nickel Coated High Strength Alloy (Table 2-3A) 260C NFC Nickel Coated Copper Flexible Stranding (Table 2-3B) 260C NFS Nickel Coate
26、d Copper Clad Steel Flexible Stranding (Table 2-3B) 260C NFH Nickel Coated High Strength Alloy Flexible Stranding (Table 2-3B) 260C SC Silver Coated Copper Standard Stranding (Table 2-3A) 200C SS Silver Coated Copper Clad Steel (Table 2-3A) 200C SH Silver Coated High Strength Alloy (Table 2-3A) 200C
27、 SFC Silver Coated Copper Flexible Stranding (Table 2-3B) 200C SFS Silver Coated Copper Clad Steel Flexible Stranding (Table 2-3B) 200C SFH Silver Coated High Strength Alloy Flexible Stranding (Table 2-3B) 200C TC Tin Coated Copper Standard Stranding (Table 2-3A) 150C TS Tin Coated Copper Clad Steel
28、 (Table 2-3A) 150C TFC Tin Coated Copper Flexible Stranding (Table 2-3B) 150C TFS Tin Coated Copper Clad Steel Flexible Stranding (Table 2-3B) 150C WC 55021-2013 Page 6 2013 National Electrical Manufacturers Association TABLE 2-3A Standard Conductor Stranding AWG size Number of strands Nominal Singl
29、e End (inch) Nominal diameter of conductor (inch) 32 7 .0031 .010 30 7 .0040 .012 28 7 .0050 .015 26 7 .0063 .019 24 19 .0050 .024 22 19 .0063 .030 20 19 .0080 .038 18 19 .0100 .048 16 19 .0113 .054 14 19 .0142 .068 12 19 .0179 .085 10 37 .0159 .108 8 133 .0113 .160 6 133 .0142 .202 4 133 .0179 .255
30、 2 133 .0223 .325 1 259 .0179 .370 TABLE 2-3B Conductor Stranding Flexible AWG size Number of strands Nominal Single End (inch) Nominal diameter of conductor (inch) 26 19 .0040 .019 24 19 .0050 .024 22 19 .0063 .030 20 19 .0080 .038 18 19 .0100 .048 16 26 .0100 .059 14 41 .0100 .075 12 65 .0100 .093
31、 10 105 .0100 .125 8 168 .0100 .166 6 259 .0100 .200 4 420 .0100 .250 2 665 .0100 .330 WC 55021-2013 Page 7 2013 National Electrical Manufacturers Association 1 817 .0100 .370 0 1045 .0100 .415 00 1330 .0100 .465 000 1672 .0100 .530 0000 2109 .0100 .590 250 2449 .0100 .680 350 3458 .0100 .815 400 39
32、90 .0100 .870 2.2.4 Color Code and Number of Conductors The color code of each individual wire is identified by a number built up from the digits designating the colors as specified in MIL-STD-681. For single shielded and single shielded and jacketed constructions, a dash should not be used. Any ord
33、er of color code designators is acceptable. The color code designations for wires 2 5 will be separated by a dash. Two groups of numbers indicate a twisted pair, three groups a twisted triple, four groups a quad, and five groups a quintuple. 2.2.5 Shield Material The shield material is identified by
34、 a letter symbol as specified in table 2-3. When double shields are specified, the two shields shall be placed in direct contact. No jacket or binder is required between the shields. TABLE 2-3 SHIELD MATERIAL 2.2.6 Jacket Material The jacket material is identified by a letter symbol as specified in
35、table 2-4. Unless otherwise specified (see 6.2), jacket colors shall be as specified under the jacket materials in accordance with Table 2-4. Letter Symbol Single Shield Letter Symbol Double Shield Shield Material Type Maximum Temperature Limit for Shield Material (Information only) U - Unshielded -
36、 N Y Nickel Coated Copper 260C S W Silver Coated Copper 200C T V Tin Coated Copper 150C WC 55021-2013 Page 8 2013 National Electrical Manufacturers Association TABLE 2-4 JACKET MATERIAL Section 3 REQUIREMENTS 3.1 Construction and Materials Construction shall comply with the designation given in 2.2.
37、 This standard covers a wide variety of possible primary wires, shields, and jacket combinations. It is strongly recommended that consultation between users and cable manufacturers be made in order to assure the most suitable cable. Materials shall be as specified herein. When a material is not spec
38、ified, a material shall be used that will enable the cable to meet the performance requirements of this specification. 3.2 Basic wire Letter Symbol Type Jacket Material Type and Color Maximum Temperature Limit for Jacket Material (Information only) 00 Unjacketed - 01 Extruded white polyvinyl chlorid
39、e (PVC) 90C (194F) 02 Extruded clear polyamide 90C (194F) 06 Extruded or taped and heat sealed white polytetrafluoroethylene (PTFE) 260C (500F) 09 Extruded white fluorinated ethylene propylene (FEP) 200C (392F) 14 Extruded white Ethylene tetra-fluoro ethylene (ETFE) 150C (302F) 20 Extruded white Per
40、fluoroalkoxy (PFA) 260C (500F) 27 Extruded white Cross-linked Polyolefin (XLPO) 105C (221F) 28 Extruded white Cross-Linked Zero Halogen Polyolefin (XLPOLYO) 105C (221F) 29 Extruded white Silicone 200C (392F) 30 Extruded white Zero Halogen Silicone 200C (392F) WC 55021-2013 Page 9 2013 National Elect
41、rical Manufacturers Association All basic wires used in the construction of a cable shall be of the same type and size (see 2.2.1 & 2.2.2). All basic wires shall be tested to verify that they conform to the applicable NEMA HP specification. Helical stripes for the purpose of wire identification shal
42、l not degrade the insulation as evidenced by failure to meet the requirements herein. Unless otherwise specified the manufacturer of the cable is responsible for assuring that the basic wire meets the wire specification requirements prior to fabricating them into a cable. 3.3 Cabling The basic wires
43、 shall be grouped together and cabled with a planetary machine so that the individual wire is not twisted and a minimum overall diameter is obtained. 3.3.1 Direction of lay The direction of lay may be left hand or right hand. 3.3.2 Length of lay The length of lay shall be not less than 8 nor more th
44、an 16 times the outside major axis diameter of the unshielded unjacketed cable bundle. The basic wire shall not be spliced. 3.4 Fillers and binder tapes When used fillers and tapes shall be of a fungus resistant material and have a minimum temperature equivalent to the cable rating without fillers a
45、nd tapes. They shall also be easily removable from the finished cable without adherence to the underlying insulation. 3.5 Shield When the cable designation specifies that a shield is to be incorporated into the cable construction, a closely woven braid shall be applied over the basic wire or cable.
46、The shield strands shall be free from lumps, kinks, abrasions, scraped or corroded surfaces, and surface impurities. The strand coating shall be smooth, continuous, and adherent to the underlying material. Before shielding, the copper strands used in the shields shall be annealed or soft-drawn coppe
47、r wire from commercially pure copper and shall conform to ASTM B3. Before application to the cable, individual tin, silver, or nickel coated copper strands shall have a minimum elongation of 6 percent. 3.5.1 Silver-coated Copper Strands When the cable designation specifies a silver-coated shield, th
48、e individual strands shall be coated uniformly with a smooth continuous layer of commercially pure silver. Prior to braiding, silver-coated copper strands shall meet the requirements of ASTM B298. The minimum thickness of the silver shall not be less than 40 in. 3.5.2 Nickel-Coated Copper Strands Wh
49、en the cable designation specifies a nickel-coated shield, the individual strands shall be coated uniformly with a smooth continuous layer of commercially pure nickel. Prior to braiding, nickel-coated copper strands shall meet the requirements of ASTM B355. The thickness of the nickel coating shall be not less than 50 in. WC 55021-2013 Page 10 2013 National Electrical Manufacturers Association 3.5.3 Tin-Coated Copper Strands When the cable designation specifies
