1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA WC 75-2015Standard for Controlled Impedance in Internal Electrical Cable 2015 National Electrical Manufacturers Association Approved as an American National Standard ANSI Approval Date: January 7, 2015 NEMA Standards Pu
2、blication WC 75-2015 Standard for Controlled Impedance in Internal Electrical Cable Published by National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2015 National Electrical Manufacturers Association. All rights, including translation i
3、nto other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literacy and Artistic Works, and the International and Pan American copyright conventions. ANSI/NEMA WC 75-2015 Page 2 2015 National Electrical Manufacturers Association NOTICE AND DISC
4、LAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the
5、development of this document. NEMA standards and guideline publications, of which the document contained herein 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
6、 topic covered by this publication. While NEMA administers the process and establishes rules to promote fairness 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
7、 any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, appli
8、cation, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, expressed or implied, 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
9、 or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or sellers 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 a
10、ny person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. 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
11、in any given circumstances. Information and other standards on the topic covered by this publication may be 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 enfo
12、rce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health- or safety-related information in this document shall not be attributable t
13、o NEMA and is solely the responsibility of the certifier or maker of the statement. NEMA WC 75-2015 Page i 2015 National Electrical Manufacturers Association Foreword In the preparation of this standards publication, input of users and other interested parties has been sought and evaluated. Inquirie
14、s, comments, and proposed or recommended revisions should be submitted to the concerned NEMA product subdivision by contacting the: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 Section approval of the sta
15、ndard does not necessarily 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. Lo
16、uis, MO Berk-Tek 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 600 V), ZHDM (rated 90C; 600 V), ZHDH (rated 90C; 600 V), ZH (rated 125C; 600 V), and ZHX (rated 125C; 10
17、00 V) SAE International 400 Commonwealth Drive Warrendale, PA 15096-0001 USA AS22759 Wire, Electrical, Fluoropolymer-Insulated, Copper or Copper Alloy ASTM B965 Standard Specification for High Performance Tin-Coated Annealed Copper Wire Intended for Electrical and Electronic Application for Solderab
18、ility 1.3 Order of Precedence In the event of a conflict between this specification and the references cited herein (except for associated detail specification sheets, or MS standards), the text of this specification shall take precedence. Nothing in this specification, however, shall supersede appl
19、icable laws or regulations unless a specific exemption has been obtained. NEMA WC 75-2015 Page 3 2015 National Electrical Manufacturers Association Section 2 Classification 2.1 General The cable shall consist of 161 pairs, shielded, or shielded and jacketed. The cable shall also be of the following
20、type designation and shall be furnished in the basic wire size, type, number of pairs, and shield and jacket styles as specified (see 2.2 and 6.2). See paragraph 2.2 for an example. 2.2 Cable Designation The type designation of cable will consist of the following form, and as specified (see 6.2): WC
21、75-100 S 24 EE 9 T 09 - A Color Code Designator (see 2.2.5) Jacket Material (see 2.2.8) Shield Material (see 2.2.7) Number of Pairs (see 2.2.6) Dielectric Type (see 2.2.4) Conductor Size (AWG) (see 2.2.3) Conductor Material and Stranding (see 2.2.2) Characteristic Impedance (2.2.1) Type designation
22、example: WC75-100S24EE9T09 Construction: S = Silver Coated Copper 24 = 24 AWG EE = PTFE 9 = Number of pairs T = Tin Copper Braid 09 = FEP Jacket A = Standard Identification Method A 2.2.1 Characteristic Impedance The nominal desired characteristic impedance shall be specified as a three digit number
23、. Examples: 050 = 50 , 075 = 75, 100 = 100 , 120 = 120 2.2.2 Conductor Material and Stranding The conductor material shall be identified by a letter symbol as specified in Table 2-1. All wire in the cable shall be the same material and stranding. Conductor material type must reflect those available
24、in the referenced component document.ANSI/NEMA WC 75-2015 Page 4 2015 National Electrical Manufacturers Association Table 2-1 Conductor Material Table 2-1a Standard Conductor Stranding AWG Size Number of Strands Nominal Stranding (Inch) Nominal Diameter of Conductor(Inch) 30 7 .0040 .012 28 7 .0050
25、.015 26 19 .0040 .019 24 19 .0050 .024 22 19 .0063 .030 20 19 .0080 .038 2.2.3 Conductor Size The conductor size is identified by the AWG size. All conductors in the cable shall be of the same size. 2.2.4 Dielectric Type The dielectric type is identified by a letter symbol as shown in Table 2-2. All
26、 wire in the cable shall be the same dielectric type. Table 2-2 Type of Wire Symbol Type Dielectric Material Temperature rating EE PTFE 65C to 200C (SPC) / 260C (NPC) KK FEP 65C to 200C (SPC) KF Foamed FEP 65C to 200C (SPC) LL XLPE 65C to 125C (TPC) TZ ETFE 65C to 150C (TPC) XE XLETFE 65C to 150C (T
27、PC) 200C (SPC) ZH Zero HalogenXLPO 65C to 85C (TPC) Letter Symbol Type Conductor Material and Stranding Type Maximum Temperature Limit for Shield Material (Information only) N Nickel Coated Copper 260C S Silver Coated Copper 200C A Silver Coated Copper Alloy 200C T Tin Coated Copper 150C NEMA WC 75-
28、2015 Page 5 2015 National Electrical Manufacturers Association 2.2.5 Color Code The individual components shall be identified by one of the following Methods. The desired method will be spelled out in the part number designator. Example: Method A shall be “A.” 2.2.5.1 Standard Identification Method
29、A The standard identification method shall consist of numbers in sequence, running from 1 through the number corresponding to the total quantity of twisted pairs in the cable. Both conductors in each pair shall be numbered the same, denoting the sequence number of the pair. Distinction between the t
30、wo conductors shall be provided by having one white and one black. Conductors of a cable with a single pair need not be numbered. 2.2.5.2 Alternate Identification Method B Method B shall be the use of solid base colors, or a white base color with tracers as required. The tracers shall be in accordan
31、ce with MIL-STD-681. Table 2-3 Alternate Identification Method A Conductor Number Color Conductor Number Color 1 Black 7 Brown 2 White 8 Gray 3 Red 9 Yellow 4 Green 10 Purple 5 Orange 11 Tan 6 Blue 12 Pink The pairing of conductors for forming pairs shall be as follows: No. 1 paired with nos. 2 thru
32、 12 for the first 11 pairs (111) No. 2 paired with nos. 3 thru 12 for the next 10 pairs (1221) No. 3 paired with nos. 4 thru 12 for the next 9 pairs (2230) No. 4 paired with nos. 5 thru 12 for the next 8 pairs (3138) No. 5 paired with nos. 6 thru 12 for the next 7 pairs (3945) No. 6 paired with nos.
33、 7 thru 12 for the next 6 pairs (4651) No. 7 paired with nos. 8 thru 12 for the next 5 pairs (5256) No. 8 paired with nos. 9 thru 12 for the next 4 pairs (5760) No. 9 paired with nos. 10 for the last pair (61) 2.2.5.3 Alternate Identification Method C Method C shall be the use of solid base colors,
34、or a white base color with tracers as required. The tracers shall be in accordance with MIL-STD-681.ANSI/NEMA WC 75-2015 Page 6 2015 National Electrical Manufacturers Association Table 2-4 Alternate Identification Method C Pair Number Color Pair Number Color Conductor 1 Conductor 2 Conductor 1 Condu
35、ctor 2 1 Blue White 32 Yellow White 2 Orange White 33 Black Violet 3 Green White 34 Orange Violet 4 Brown White 35 Orange Green 5 Gray White 36 Yellow Violet 6 Blue Red 37 Red Violet 7 Orange Red 38 Orange Blue 8 Green Red 39 Green Blue 9 Brown Red 40 Yellow Black 10 Gray Red 41 Blue Gray 11 Blue Bl
36、ack 42 Orange Gray 12 Orange Black 43 Green Gray 13 Green Black 44 Brown Gray 14 Brown Black 45 Red Black 15 Gray Black 46 Blue Pink 16 Blue Yellow 47 Orange Pink 17 Orange Yellow 48 Green Pink 18 Green Yellow 49 Brown Pink 19 Brown Yellow 50 Red Pink 20 Gray Yellow 51 White Pink 21 Red Yellow 52 Bl
37、ack Pink 22 Blue Violet 53 Violet Pink 23 Green Violet 54 Gray Pink 24 Brown Violet 55 Tan Pink 25 Gray Violet 56 Blue Tan 26 Blue Brown 57 Orange Tan 27 Orange Brown 58 Green Tan 28 Green Brown 59 Brown Tan 29 White Black 60 Red Tan 30 White Violet 61 White Tan 31 White Red 2.2.6 Number of Pairs Th
38、e number of pairs per cable shall be as designated in the part number. They are available from one (1) to sixty-one (61) pairs. 2.2.7 Shield Material The shield material is identified by a letter symbol as specified in Table 2-5. When double shields are specified, the two shields shall be placed in
39、direct contact. No jacket or binder is required between the shields. Aluminum polyester tapes (APE) shall be .00135. Aluminum polyimide shall be .002 in thickness. Aluminum meta-aramid shall be .003 in thickness. For Shield Symbols A, E, J, and P a drain wire shall be applied in contact with the foi
40、l side of the braid which shall be facing out. The drain shall be the same AWG and material as the component wires in the cable. For all other Shield Symbols the foil side of the tape shall be facing out on the inner tape, and the foil side shall be facing in on the outer tape so as to ground the fo
41、ils to the braid(s). NEMA WC 75-2015 Page 7 2015 National Electrical Manufacturers Association Table 2-5 Shield Material & Rating 2.2.8 Jacket Material The jacket material is identified by a letter symbol as specified in Table 2-6. Unless otherwise specified (see 6.2), jacket colors shall be as spec
42、ified under the jacket materials in accordance with Table 2-6.Letter Symbol Shield Shield Material & Type Maximum Temperature Limit for Shield Material (Information only) U Unshielded - N Single Nickel Coated Copper 260C S Single Silver Coated Copper 200C T Single Tin Coated Copper 150C Y Double Nic
43、kel Coated Copper 260C W Double Silver Coated Copper 200C V Double Tin Coated Copper 150C A APE 150C B APE / Single Tin Coated Copper 150C C APE / Single Tin Coated Copper / APE 150C D APE / Double Tin Coated Copper / APE 150C E API 200C F API / Single Nickel Coated Copper 200C G API / Single Nickel
44、 Coated Copper / API 200C H API / Double Nickel Coated Copper / API 200C J APA 200C K APA / Single Nickel Coated Copper 200C L APA / Single Nickel Coated Copper / APA 200C M APA / Double Nickel Coated Copper / APA 200C P API 200C Q API / Single Silver Coated Copper 200C R API / Single Silver Coated
45、Copper / API 200C X API / Double Silver Coated Copper / API 200C ANSI/NEMA WC 75-2015 Page 8 2015 National Electrical Manufacturers Association Table 2-6 Jacket Material Letter Symbol Type Jacket Material Type and Color Maximum Temperature Limit for Jacket Material (Information only) 00 Unjacketed -
46、 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 perfluoroalkoxy (PFA) 250C (482F) 23 Extruded white Irradiat
47、ion cross-linked ethylene tetra-fluoroethylene (ETFE) 200C (392F) 27 Extruded gray cross-linked polyolefin (XLPO) 125C (221F) 28 Extruded white cross-linked zero halogen polyolefin (XLPOLYO) 105C (221F) 31 Extruded black cross-linked zero halogen polyolefin (XLPOLYO) 105C (221F) 32 Extruded black cr
48、oss-linked ethylene-propylene dinene monomer (EPDM) 105C (221F) 33 Extruded or blown on black polychloroprene (neoprene) 90C (194F) 34 Extruded polyurethane (Black) 90C (194F) 35 Extruded low-smoke, zero-halogen polyurethane (black) 90C (194F) NEMA WC 75-2015 Page 9 2015 National Electrical Manufact
49、urers Association Section 3 Requirements 3.1 Construction and Materials Construction shall comply with the designation given in 2.2. 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 specified, a material shall be used t
