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GB/T 1179-2017 English PDF

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GB/T 1179-2017: Round wire concentric lay overhead electrical stranded conductors
Status: Valid

GB/T 1179: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 1179-2017English1359 Add to Cart 10 days [Need to translate] Round wire concentric lay overhead electrical stranded conductors Valid GB/T 1179-2017
GB/T 1179-2008EnglishRFQ ASK 7 days [Need to translate] Round wire concentric lay overhead electrical stranded conductors Obsolete GB/T 1179-2008
GB/T 1179-1999EnglishRFQ ASK 6 days [Need to translate] Round wire concentric lay overhead electrical stranded conductors Obsolete GB/T 1179-1999
GB/T 1179-1983EnglishRFQ ASK 3 days [Need to translate] Aluminium stranded conductors and aluminium conductors, steel-reinforced Obsolete GB/T 1179-1983

PDF similar to GB/T 1179-2017


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Basic data

Standard ID GB/T 1179-2017 (GB/T1179-2017)
Description (Translated English) Round wire concentric lay overhead electrical stranded conductors
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K11
Classification of International Standard 29.060.10
Word Count Estimation 68,697
Date of Issue 2017-11-01
Date of Implementation 2018-05-01
Older Standard (superseded by this standard) GB/T 1179-2008
Quoted Standard GB/T 3048.2-2007; GB/T 3048.4-2007; GB/T 3428-2012; GB/T 4909.2-2009; GB/T 17048-2017; GB/T 17937-2009; JB/T 8137.1-2013; JB/T 8137.2-2013; JB/T 8137.3-2013; JB/T 8137.4-2013; NB/T 42042-2014; IEC/TR 61597-1995
Adopted Standard IEC 61089-1991, MOD
Regulation (derived from) National Standard Announcement 2017 No. 29
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the electrical performance and mechanical properties of round wire concentric wire rope.

GB/T 1179-2017: Round wire concentric lay overhead electrical stranded conductors

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Round wire concentric lay overhead electrical stranded conductors ICS 29.060.10 K11 National Standards of People's Republic of China Replace GB/T 1179-2008 Round wire concentric stranded overhead wire (IEC 61089..1991, MOD) Released.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword III 1 Scope 1 2 Normative references 3 3 Terms and Definitions 3 4 Product representation method and example 4 5 stranded wire requirements 5 6 Test 8 7 packaging and signs 11 Appendix A (informative) Recommended wire size and wire performance Table 13 Appendix B (Normative) The nominal mass of wire anticorrosive grease 55 Appendix C (Informative Appendix) Elastic Modulus and Linear Expansion Coefficient of Round Wire Concentric Stranded Aerial Wire Products 57 Appendix D (Normative) Stress-Strain Test Method 60 Appendix E (Normative Appendix) Information provided by the acquirer 62 Appendix F (informative) Structural changes in this standard compared to IEC 61089.1991 63 Appendix G (informative appendix) Technical differences between this standard and IEC 61089.1991 and its causes 64

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 1179-2008 "round wire concentric stranded overhead conductor", compared with GB/T 1179-2008 main technical changes as follows. --- Removed the relevant description of the specification number, using the nominal section representation method (see Appendix D of the.2008 version); --- Merged Appendix D and Appendix E of the.2008 version, removed the unusual specifications, increased the domestic common model specifications, and formed a new Appendix A. (See Appendix A, Appendix D and Appendix E of the.2008 edition); --- Modified the common specifications of aluminum alloy stranded wire JLHA (1, 2), increased the recommended wire size and wire performance of JLHA (3, 4) (See Table 1 and Appendix A); ---Modified the common specifications of aluminum clad steel stranded wire JLB (14, 20A), and increased the recommended wire of aluminum clad steel stranded wire JLB (27, 35, 40) Dimensions and wire properties (see Table 1 and Appendix A); ---All galvanized steel wire (including reinforcing core and steel strand), removed the B-grade galvanized layer (see 1.1 and Appendix A,.2008 version 1.1 and Appendix D); --- Increased wire size and wire performance recommended by steel strand JG (4, 5) A (see Table 1 and Appendix A); --- Increased wire size and wire performance recommended by steel core aluminum stranded wire JL (1, 2, 3)/G (1, 2, 3) A (see Table 1 and Appendix A); ---Modified the common specifications of steel core aluminum alloy stranded wire JLHA (1, 2)/G (1, 2, 3) A, increase the power JLHA (3, 4)/G (1, 2, 3) A recommended wire size and wire performance (see Table 1 and Appendix A); --- Increased wire sizes recommended by aluminum-clad steel core aluminum stranded wires JL/LB14, JL (1, 2, 3)/LB14 and JL (1, 2, 3)/LB20A Wire performance (see Table 1 and Appendix A); --- Increased wire size and wire performance recommended by aluminum-clad steel core aluminum alloy stranded wire JLHA (1, 2)/LB14, modified JLHA (1, 2)/LB20A common specifications (see Table 1 and Appendix A); --- Increased wire size and wire performance recommended by aluminum alloy core aluminum stranded wire JL (1, 2, 3)/JLHA (1, 2) (see Table 1 and Appendix) A); --- Added part of the "standard increment caused by the twist" (see Table 4 and Table 5, Table 4 of the.2008 version); --- Revised the rated breaking force (RTS) calculation method (see 5.7, 4.7 of the.2008 version); --- Added "creep test" and "strand resistance" as type test items (see 6.2.1 and 6.5.5, 6.5.6); --- Added "single line performance after twisting" as a sampling test project (see 6.2.2); --- Increased the "stretching force test" arbitration test method (see 6.5.3); --- Added the informational Appendix C "Elastic Modulus and Linear Expansion Coefficient of Round Wire Concentric Stranded Aerial Wire Products" (see Appendix C); --- Added the informative Appendix G "Technical differences and causes of this standard and IEC 61089.1991" (see Appendix G). This standard uses the redrafting method to modify the use of IEC 61089.1991 "round wire concentric stranded overhead conductor" and its amendment 1 (1997). This standard has more structural adjustments than IEC 61089.1991. This standard and IEC 61089.1991 are listed in Appendix F. The chapter number is compared to the list. There are technical differences between this standard and IEC 61089.1991, and the terms involved in these differences have been passed on the outer margins of the margins. The vertical single line (|) is marked, and a list of the corresponding technical differences and their causes is given in Appendix G. IEC 61089.1991 Amendment 1 (1997) of the Round Wire Concentric Twisted Overhead Wire has been directly incorporated into this standard, and the provisions relating to these contents have been passed on the outside. The vertical double line (‖) of the margin position is marked This standard was proposed by the China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Bare Wire Standardization Technical Committee (SAC/TC422). This standard was drafted by Shanghai Cable Research Institute, Shanghai National Cable Testing Center Co., Ltd., Jiangsu Zhongtian Technology Co., Ltd., Yuan East Cable Co., Ltd., Hangzhou Cable Co., Ltd., Jiangsu Hengtong Power Special Wire Co., Ltd., Aerospace Electric Group Co., Ltd., Qing Island Han Cable Co., Ltd., TBEA Electric Co., Ltd. Xinjiang Cable Factory, Wuxi Huaneng Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd. Company, China Electric Power Research Institute, China Southern Power Grid Science Research Institute Co., Ltd., Guangdong Xinyaguang Cable Industry Co., Ltd., Guangdong Yuan Optical Cable Industry Co., Ltd., Henan Tongda Cable Co., Ltd., Zhengzhou Huali Cable Co., Ltd., Henan Kexin Cable Co., Ltd., River North Xingtai Cable Co., Ltd., Shenyang Liyuan Cable Co., Ltd., Liaoning Zhongxing Cable Co., Ltd., Huangshan Chuangxiang Technology Co., Ltd. The division participated in the drafting. The main drafters of this standard. Huang Guofei, Wang Wei, You Weiren, Xu Jing, Hu Jianming, Ma Jun, Sun Zeqiang, Zhao Xinyuan, Duan Guoquan, Yang Huai, Zhang Chuansheng, Wang Jingchao, Wan Jiancheng, Li Bin, Yan Xiaopeng, Jiang Luzhen, Cai Xiaoxian, Jiang Hongyi, Ouyang Bin, Meng Guangji, Zhang Weiguo, Xu Changxing, Xu Leigang. The previous versions of the standards replaced by this standard are. ---GB 1179-1983, GB/T 1179-1999, GB/T 1179-2008. Round wire concentric stranded overhead wire

1 Scope

1.1 This standard specifies the electrical and mechanical properties of round wire concentric stranded conductors. Round wire concentric stranded overhead wire by any of the following Metal single wire combination. a) Aluminum and aluminum alloy wire L-shaped hard aluminum wire, in line with GB/T 17048-2017; L1 type hard aluminum wire, in line with GB/T 17048-2017; L2 type hard aluminum wire, in line with GB/T 17048-2017; L3 type hard aluminum wire, in line with GB/T 17048-2017; LHA1 type aluminum alloy wire, in line with GB/T 23308-2009; LHA2 type aluminum alloy wire, in line with GB/T 23308-2009; LHA3 type aluminum alloy wire, in line with NB/T 42042-2014; LHA4 type aluminum alloy wire, in line with NB/T 42042-2014. b) Galvanized steel wire for overhead stranding G1A steel wire, in line with GB/T 3428-2012; G2A steel wire, in line with GB/T 3428-2012; G3A steel wire, in line with GB/T 3428-2012; G4A steel wire, in line with GB/T 3428-2012; G5A steel wire, in line with GB/T 3428-2012; Note 1. G1B or G2B steel wire in GB/T 3428-2012 can be used when special engineering is required. c) Aluminum clad steel wire LB14 aluminum clad steel wire, in line with GB/T 17937-2009; LB20A aluminum clad steel wire, in line with GB/T 17937-2009; LB27 aluminum clad steel wire, in line with GB/T 17937-2009; LB35 aluminum clad steel wire, in line with GB/T 17937-2009; LB40 aluminum clad steel wire, in line with GB/T 17937-2009. Note 2. The resistivity of single-wire metals is arranged in ascending order as follows. L3. 27.586nΩ·m (corresponding to 62.5% IACS) L2. 27.808nΩ·m (corresponds to 62% IACS) L1. 28.034nΩ·m (corresponding to 61.5% IACS) L. 28.264nΩ·m (corresponding to 61% IACS) LHA3. 29.472nΩ·m (corresponds to 58.5% IACS) LHA4. 30.247nΩ·m (corresponds to 57% IACS) LHA2. 32.530nΩ·m (corresponds to 53% IACS) LHA1. 32.840nΩ·m (corresponding to 52.5% IACS) LB40. 43.10nΩ·m (corresponding to 40% IACS) LB35. 49.26nΩ·m (corresponding to 35% IACS) LB27. 63.86nΩ·m (corresponds to 27% IACS) LB20A. 84.80nΩ·m (corresponding to 20.3% IACS) LB14. 123.15nΩ·m (corresponds to 14% IACS) G1A. 191.57nΩ·m (corresponding to 9% IACS) G2A. 191.57nΩ·m (corresponding to 9% IACS) G3A. 191.57nΩ·m (corresponding to 9% IACS) G4A. 191.57nΩ·m (corresponding to 9% IACS) G5A. 191.57nΩ·m (corresponding to 9% IACS) Note 3. The density of single-line metals is arranged in ascending order as follows. Aluminum or aluminum alloy. 2.703g/cm3 Aluminum clad steel wire. LB40. 4.64g/cm3 LB35. 5.15g/cm3 LB27. 5.91g/cm3 LB20A. 6.59g/cm3 LB14. 7.14g/cm3 Galvanized steel wire. 7.78g/cm3 Note 4. Both the supply and demand sides agree. a small amount of mixed rare earth may be added to the hard aluminum wire; the coated metal of the galvanized steel wire may also be a special galvanized layer, such as. zinc-5% Aluminium-rare earth alloy plating layer, 55% aluminum-zinc alloy plating layer, etc., which have a higher corrosion resistance than a general galvanized layer. Using the above specific single line combination Lines should be specified when ordering. 1.2 The model representations of various types of round wire concentric stranded overhead conductor products included in this standard are as follows. For the model and name of each type of product, see Table 1. 1.2.1 The first letter of the wire type uses J to indicate concentric stranding. 1.2.2 A single wire is followed by a single wire code that makes up the wire. 1.2.3 The combined wire is the code of the outer wire (or outer wire) and the inner wire (or wire core) behind J, which are separated by "/". 1.2.4 Adding the anti-corrosion code F at the end of the model indicates that the wire is coated with anti-corrosion oil. Table 1 Model and name of the wire Model Name JL aluminum stranded wire JLHA1, JLHA2, JLHA3, JLHA4 aluminum alloy stranded wire JL/G1A, JL/G2A, JL/G3A JL1/G1A, JL1/G2A, JL1/G3A JL2/G1A, JL2/G2A, JL2/G3A JL3/G1A, JL3/G2A, JL3/G3A Steel core aluminum stranded wire JL/G1AF, JL/G2AF, JL/G3AF JL1/G1AF, JL1/G2AF, JL1/G3AF JL2/G1AF, JL2/G2AF, JL2/G3AF JL3/G1AF, JL3/G2AF, JL3/G3AF Anticorrosive steel core aluminum stranded wire JLHA1/G1A, JLHA1/G2A, JLHA1/G3A JLHA2/G1A, JLHA2/G2A, JLHA2/G3A JLHA3/G1A, JLHA3/G2A, JLHA3/G3A JLHA4/G1A, JLHA4/G2A, JLHA4/G3A Steel core aluminum alloy stranded wire JLHA1/G1AF, JLHA1/G2AF, JLHA1/G3AF JLHA2/G1AF, JLHA2/G2AF, JLHA2/G3AF JLHA3/G1AF, JLHA3/G2AF, JLHA3/G3AF JLHA4/G1AF, JLHA4/G2AF, JLHA4/G3AF Anticorrosive steel core aluminum alloy stranded wire Table 1 (continued) Model Name JL/LHA1, JL1/LHA1, JL2/LHA1, JL3/LHA1 JL/LHA2, JL1/LHA2, JL2/LHA2, JL3/LHA2 Aluminum alloy core aluminum stranded wire JL/LB14, JL1/LB14, JL2/LB14, JL3/LB14 JL/LB20A, JL1/LB20A, JL2/LB20A, JL3/LB20A Aluminum-clad steel core aluminum stranded wire JLHA1/LB14, JLHA2/LB14 JLHA1/LB20A, JLHA2/LB20A Aluminum-clad steel core aluminum alloy stranded wire JLHA1/LB14F, JLHA2/LB14F JLHA1/LB20AF, JLHA2/LB20AF Anti-corrosion aluminum-clad steel core aluminum alloy stranded wire JG1A, JG2A, JG3A, JG4A, JG5A steel strand JLB14, JLB20A, JLB27, JLB35, JLB40 aluminum-clad steel stranded wire

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 3048.2-2007 Test methods for electrical properties of wires and cables - Part 2. Electrical resistivity testing of metallic materials (IEC 60468. 1974, MOD) GB/T 3048.4-2007 Test methods for electrical properties of wires and cables - Part 4. Conductor DC resistance test GB/T 3428-2012 Galvanized steel wire for overhead stranded wire (IEC 60888.1987, MOD) GB/T 4909.2-2009 Test methods for bare wires - Part 2 GB/T 17048-2017 Hard aluminum wire for overhead stranding (IEC 60889.1987, MOD) GB/T 17937-2009 Aluminum-clad steel wire for electricians (IEC 61232.1993, MOD) GB/T 22077-2008 Aerial wire creep test method (IEC 61395.1998, IDT) GB/T 23308-2009 Aluminum-magnesium-silicon alloy round wire for overhead stranding (IEC 60104.1987, IDT) JB/T 8137-2013 (all parts) Wire and cable delivery tray NB/T 42042-2014 Medium strength aluminum alloy wire for overhead stranded wire IEC /T R61597.1995 Overhead electrical conductors-Calculation Methodsforstrandedbareconductors)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Wire conductor A material for transmitting electrical current, which is made by twisting together a plurality of non-insulated single wires. 3.2 Concentric stranded wire concentriclaystrandedconductor A wire consisting of one or more single wires is spirally wound around a center core, and adjacent layers are twisted in opposite directions. 3.3 Twisted to directionoflay The twisting direction of a single line, that is, from the direction of movement away from the observer. The right direction is clockwise and the left direction is counterclockwise. another Definition. Rightward, when the strand is placed vertically, the single line conforms to the direction of the middle part of the English letter Z; the left direction is when the strand is placed vertically. The single line conforms to the direction of the middle part of the English letter S. 3.4 Pitch laylength A single wire in the strand forms the axial length of a complete spiral. 3.5 Section ratio layratio The ratio of the pitch of a single wire in a stranded wire to the outer diameter of the layer. 3.6 Batch lot A batch of wires produced by the same manufacturer under the same production conditions. Note. A batch can include some or all of the order quantity. 3.7 Nominal A nominal or flag value of measurable performance used to indicate a wire or its constituent single wire with a given tolerance. The nominal value is its target value. 3.8 Steel than steelratio The ratio of the cross-sectional area of the steel to the cross-sectional area of the aluminum expressed as a percentage. 3.9 Single wire A drawn metal wire having a defined circular cross section.

4 Product representation and examples

4.1 Product representation method 4.1.1 The product is indicated by model number, nominal section, stranded structure and this standard number. 4.1.2 The single material wire is directly indicated by its nominal cross section, and the combined conductor is “nominal cross section of conductive material/reinforced core material nominal section "face". 4.1.3 The stranded structure is represented by the number of single wires constituting the wire, and the single wire is directly represented by the number of single wires, and the combined wire is made of "conductive material". The number of roots/number of reinforcing core materials is expressed. 4.2 Product Representation Example Example 1. JL-500-37. Aluminum stranded wire made of 37 hard aluminum strands with a nominal cross section of 500 mm2. Example 2. JLHA1-400-37. Aluminum alloy stranded wire made of 37 LHA1 type aluminum alloy wires, with a nominal cross section of 400 mm2. Example 3. JL/G1A-630/45-45/7. Steel-cored aluminum stranded wire made of 45 L-shaped hard aluminum wires and 7 Grade A-plated grade 1 galvanized steel wires, hard aluminum The nominal cross section of the wire is 630 mm2 and the nominal cross section of the steel wire is 45 mm2. Example 4. JLHA2/G3A-800/55-45/7. Steel core twisted from 45 LHA2 type aluminum alloy wires and 7 grade A plating grade 3 strength galvanized steel wires Aluminum alloy stranded wire, the nominal section of the aluminum alloy wire is 800mm2, and the nominal section of the steel wire is 55mm2. Example 5. JL3/LB20A-630/55-48/7. Aluminum-clad steel made of 48 L3 hard aluminum wires and 7 20.3% IACS conductivity A-type aluminum clad steel wires The core aluminum stranded wire, the hard aluminum wire has a nominal cross section of 630 mm2, and the aluminum clad steel wire has a nominal cross section of 55 mm2. Example 6. JL2/LHA1-465/210-42/19. Aluminum alloy core aluminum stranded wire made of 42 L2 hard aluminum wire and 19 LHA1 type aluminum alloy wire, hard The nominal cross section of the aluminum wire is 465 mm2, and the nominal cross section of the aluminum alloy wire is 210 mm2. Example 7. JLB20A-150-19. Aluminum-clad steel stranded wire made of 19 20.3% IACS conductivity A-type aluminum clad steel wire, the nominal cross section of the aluminum clad steel wire is 150mm2. Example 8. JG3A-100-19. galvanized steel strand made of 19 grade A graded 3 grade galvanized steel strands with a nominal cross section of 100 mm2. Note. In the above example representation, the standard number is omitted later for simplification.

5 stranded wire requirements

5.1 Materials The stranded conductor shall be made of one or two single wires of round hard aluminum wire, round aluminum alloy wire, round galvanized steel wire and round aluminum clad steel wire. All single lines in front of the unit shall comply with the corresponding standards in Chapter 2. 5.2 wire size Appendix A lists the wire size list as a guide and recommends the size of the newly designed wire to choose from. Existing or established The used wires for overhead lines and the dimensions and structures not covered by this standard can be designed and provided according to the agreement between the supplier and the buyer. Meet the relevant requirements of this standard. 5.3 Surface The surface of the wire shall not have visually visible defects, such as obvious scratches, indentations, etc., and shall not have any disproportionate to good goods. defect. 5.4 Twisting 5.4.1 All single wires of the conductor shall be concentrically twisted. 5.4.2 The twisting direction of adjacent layers shall be reversed, unless the purchaser has special instructions when ordering, the outermost stranding direction shall be “right direction”. 5.4.3 Each layer of single wire shall be evenly and tightly twisted on the lower center core or inner strand. 5.4.4 The stranding pitch ratio of the wire shall comply with the requirements of Table 2. For stranded wires with multiple layers, the pitch-to-diameter ratio of any layer should be no greater than immediately adjacent to the inner layer. The aspect ratio. 5.4.5 All steel wires (aluminum-clad steel wire) after stranding shall be naturally in their respective positions. When cut, 19 or less steel strands (aluminum-clad steel strands) Line) Each line end should be kept in place or easily reset by hand. More than 19 steel strands (aluminum-clad steel stranded wire) should meet this requirement as much as possible. This requirement The same applies to the outer aluminum strand of the wire. Table 2 wire stranding pitch ratio Stranded layer pitch ratio Steel and aluminum clad steel reinforcement core

6 layers

12 layers 16~26 14~22 Aluminum and aluminum alloy strands Outer layer Inner layer 10~14 10~16 Steel and aluminum clad steel strands all strands 10~16 5.4.6 Before twisting, the temperature of all single wires constituting the stranded wire shall be substantially the same. 5.5 connector 5.5.1 During the stranding process, there shall be no joints for single or multiple galvanized steel wires (or aluminum clad steel wires). 5.5.2 Each manufactured length of wire shall not use more than one finished aluminum or aluminum alloy single wire as described in 5.1. 5.5.3 There shall be no aluminum or aluminum alloy wire joints made in order to achieve the required wire length during the stranding process. 5.5.4 In the process of twisting, if the single wire of aluminum or aluminum alloy is accidentally broken, as long as the fracture is neither inherently defective by a single wire nor because When a short length of aluminum or aluminum alloy wire is used, a single wire of aluminum or aluminum alloy is allowed to have a joint. The joint should conform to the geometry of the original single wire, for example The joint shall be lightened to a diameter equal to the diameter of the original single wire and shall not be bent. The joint of aluminum or aluminum alloy single wire shall not exceed the values specified in Table 3. On the same single line or in the entire wire, between any two joints The distance should be no less than 15m. The joints should be made by cold pressure welding and other approved methods. These joints should be made in accordance with good manufacturing practices. 5.5.5 When the joint specified in 5.5.4 is not required to meet the requirements of unwelded single wire, the tensile strength of the hard aluminum wire joint shall not be less than The tensile strength of 130MPa, LHA3 and LHA4 aluminum alloy wire joints shall not be less than 185MPa, and the LHA1 and LHA2 type aluminum alloy wires shall be connected. The tensile strength of the head should not be less than 250 MPa. The manufacturer shall demonstrate that the above welding method meets the specified tensile strength requirements. Table 3 Number of joints allowed for aluminum and aluminum alloy wires Number of aluminum strands manufactured by the number of joints allowed twenty three 5.6 Line Density---Quality per unit length 5.6.1 The quality of the conductors of various sizes and stranded structures is specified in the table in Appendix A, using the aluminum specified in Chapter 1 of this standard. Density of wire, aluminum alloy wire, aluminum clad steel wire and steel wire, stranding increment specified in Tables 4 and 5, and aluminum and aluminum based on theoretical unrepaired diameter The cross-sectional area of the alloy wire, the aluminum-clad steel wire and the steel wire is calculated. 5.6.2 The mass and resistance increment caused by the average pitch ratio specified in 5.4.4 shall be selected in Table 4 or Table 5, in increments of The number indicates. Note. After a single-wire twisted composite strand, all single wires are longer than the strand except for the centerline, and the increment depends on the pitch ratio used. Table 4 Stranded increment of stranded wire (except aluminum alloy core aluminum stranded wire) Twisted structure Increment (increase) a Twisted structure Increment (increase) a Aluminum steel quality Single line The number of Strand Number b Single line The number of Strand Number b Aluminum steel resistance Aluminum steel quality Single line The number of Strand Number b Single line The number of Strand Number b Aluminum steel resistance 6 1 1 - 1.52 - 1.52 30 2 19 2 2.23 0.77 2.23 7 1 7 1 1.67 0.43 1.67 54 3 19 2 2.33 0.77 2.33 12 1 7 1 2.17 0.43 2.17 72 4 19 2 2.32 0.77 2.32 18 2 1 - 1.90 - 1.90 76 4 19 2 2.34 0.77 2.34 22 2 7 1 2.04 0.43 2.04 84 4 19 2 2.40 0.77 2.40 Table 4 (continued) Twisted structure Increment (increase) a Twisted structure Increment (increase) a Aluminum steel quality Single line The number of Strand Number b Single line The number of Strand Number b Aluminum steel resistance Aluminum steel quality Single line The number of Strand Number b Single line The number of Strand Number b Aluminum steel resistance 24 2 7 1 2.08 0.43 2.08 88 4 19 2 2.39 0.77 2.39 26 2 7 1 2.16 0.43 2.16 7 1 - - 1.31c - 1.31c 30 2 7 1 2.23 0.43 2.23 19 2 - - 1.80c - 1.80c 42 3 7 1 2.23 0.43 2.23 37 3 - - 2.04c - 2.04c 45 3 7 1 2.23 0.43 2.23 61 4 - - 2.19c - 2.19c 48 3 7 1 2.24 0.43 2.24 91 5 - - 2.30c - 2.30c 54 3 7 1 2.33 0.43 2.33 - - 7 1 - 1.11d 1.11d 72 4 7 1 2.32 0.43 2.32 - - 19 2 - 1.58d 1.58d 76 4 7 1 2.34 0.43 2.34 - - 37 3 - 1.84d 1.84d 84 4 7 1 2.40 0.43 2.40 The increments in the table are calculated using the average pitch ratio of each corresponding strand. b The number of concentric stranded single strands of each type does not include the centerline. c The increment of the aluminum clad steel str...

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