CSA G12-2014 Zinc-coated steel wire strand (Fourth Edition).pdf

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21、 S tandards Association, operating as “CSA Group”Zinc-coated steel wire strandG12-14G12-14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group 1ContentsTechnical Committee on Overhead Electrical Conductors 3Preface 61 Scope 72 Reference publications 73 Definitions 84 Steel wire requirements 84.

22、1 General requirements 84.1.1 Type of steel 84.1.2 Type of zinc 84.1.3 Condition of the bare wire 94.1.4 Joints 94.1.5 Finish 94.2 Dimensional,mechanical property, and coating requirements 94.2.1 General 94.2.2 Wire diameter tolerance and roundness requirements 94.2.3 Tensile strength and elongation

23、 requirements 94.2.4 Ductility requirements 104.2.5 Zinc-coating adherence requirements 104.2.6 Zinc coating 105 Steel strand requirements 115.1 General requirements 115.1.1 Condition of the strand 115.1.2 Lubrication 115.1.3 Factory joints 115.1.4 Lay 125.1.5 Diameter 125.2 Mechanical requirements

24、of the completed steel strand 155.2.1 Constructions, rated breaking strength, and mass (weight) requirements 155.2.2 Elongation requirement 156 Strand length tolerance 157 Packaging 167.1 Reels and coils 167.2 Ends and binding 167.3 Inside coil diameter 168 Marking: Tags 169 Quality assurance 16G12-

25、14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group 210 Sampling procedures 1610.1 Sampling procedure for wire prior to fabrication into a strand 1610.2 Sampling procedure for completed strand 1711 Test procedures 1711.1 Zinc-coated wire 1711.1.1 Diameter tolerance and roundness tests 1711.1

26、.2 Tension test 1711.1.3 Elongation test 1711.1.4 Ductility and zinc-coating adherence tests 1711.1.5 Mass (weight) of zinc-coating test 1811.1.6 Retests 1811.2 Zinc-coated strand 1811.2.1 Rated breaking strength test 1811.2.2 Elongation test 1811.2.3 Retests 1812 Information to be supplied to the v

27、endor by the purchaser 19G12-14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group 3Technical Committeeon OverheadElectricalConductorsJ. Duxbury Surrey, British ColumbiaCategory: General InterestChairJ.M. Asselin General Cable Canada Ltd.,Brampton, OntarioCategory: Producer InterestVice-ChairG

28、.C. Baker General Cable Industries, Inc.,Highland Heights, Kentucky, USAAssociateC. Culinescu Hydro One Networks Inc.,Toronto, OntarioAssociateK. Dostie British Columbia Hydro,Burnaby, British ColumbiaAssociateE. Ghannoum Outremont, QubecCategory: General InterestS. Godin Intral b) provide an explan

29、ation of circumstances surrounding the actual field condition; andc) where possible, phrase the request in such a way that a specific “yes” or “no” answer will address theissue.Committee interpretations are processed in accordance with the CSA Directives and guidelines governingstandardization and a

30、re available on the Current Standards Activities page at standardsactivities.csa.ca.5) This Standard is subject to review five years from the date of publication. Suggestions for its improvement willbe referred to the appropriate committee. To submit a proposal for change, please send the followingi

31、nformation to inquiriescsagroup.org and include “Proposal for change” in the subject line:a) Standard designation (number);b) relevant clause,table, and/or figure number;c) wording of the proposed change; andd) rationale for the change.G12-14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group

32、7G12-14Zinc-coatedsteel wire strand1 Scope1.1This Standard describes zinc-coated steel wire strand suitable for use as guys, suspension strand, spanwires, and overhead ground wire strand. Overhead ground wire strand for electric power transmission isproduced free of wire joints. Included are require

33、ments for Grades 800, 1100, 1300, and 1500 (110, 160,180, and 220). Zinc coatings for all grades include hot-dip Class A and electro-galvanized Class A, B, or C.Construction features include strands containing 7, 19, or more than 19 wires.1.2This Standard is not intended for use in the manufacture a

34、nd purchase of galvanized bridge or ACSRstrands, smooth coil track strand, or galvanized sash cord.1.3The values given in SI units are the units of record for the purposes of this Standard. The values given inparentheses are for information and comparison only. The values stated in each system are n

35、ot exactequivalents. Each system is to be used independently of the other.1.4In this Standard,“shall” is used to express a requirement, i.e., a provision that the user is obliged tosatisfy in order to comply with the standard; “should” is used to express a recommendation or thatwhich is advised but

36、not required; and “may” is used to express an option or that which is permissiblewithin the limits of the standard.Notes accompanying clauses do not include requirements or alternative requirements; the purpose of anote accompanying a clause is to separate from the text explanatory or informative ma

37、terial.Notes to tables and figures are considered part of the table or figure and may be written asrequirements.Annexes are designated normative (mandatory) or informative (nonmandatory)to define theirapplication.2 Reference publicationsThis Standard refers to the following publications and where su

38、ch reference is made, it shall be to theedition listed below, including any amendments published thereto.CSA GroupG162.1-M1977(withdrawn)Methods of determining mass of coating on zinc-coated (galvanized) steel wireG12-14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group 8Z90-1975(withdrawn)In

39、troduction to sampling proceduresfor materials and manufacturedproductsASTM (ASTM International)B6-13Specification for Zinc3 DefinitionsThe following definitions shall apply in this Standard:Centre wire the wire in the axis of a strand about which the remaining wires are laid.Construction the number

40、 and arrangement of the wires in a strand.Designated strand size a reference to indicate the strand size and construction.Electro-zinc-coated (electro-galvanized) a type of zinc coating produced by passing the wire throughan electrolytic cell containing zinc salts.Grade of strand a designation of st

41、rand in terms of the strength grade of the wire used in thefabrication of the strand.Hot-dip-coated a type of zinc coating produced by passing the wire through molten zinc.Left-hand lay a counter-clockwise twist of the outer wire layer of a strand away from the observer.Pitch the axial length of one

42、 complete turn of the helix formed by an individual wire in a strand.Quality assurance a planned and systematic pattern of all means and actions designed to provideadequate confidence that items or services meet contractual and jurisdictionalrequirements and willperform satisfactorily in service. Qu

43、ality assurance includes quality control.Quality control those actions that provide a means to measure and regulate the characteristics of anitem or service to established requirements.Strand an assembly of wires laid helically around a centre wire in one or more symmetrical layer(s).Zinc-coated (wi

44、re) a wire that has a coating of zinc applied by either the hot-dip process or theelectro-galvanizing process.4 Steel wire requirements4.1 General requirements4.1.1 Type of steelThe wire shall be made from steel produced by the basic open hearth, electric furnace, or basic oxygensteelmaking process.

45、4.1.2 Type of zincThe slab zinc when used for the coating shall be any grade of zinc conforming to ASTM B6.G12-14 Zinc-coated steel wire strandOctober 2014 2014 CSA Group 94.1.3 Conditionof the bare wireThe bare wire shall be of smooth uniform finish consistent with good commercial practice and free

46、 frominjurious defects.4.1.4 JointsThere shall be no joints of any kind made in the finished wire to be used in overhead ground wire strand.Electrically butt-welded joints made prior to the start of wire drawing shall be permitted.4.1.5 FinishThe zinc-coated wire shall be free from any imperfections

47、 not consistent with good commercial practice.The zinc-coating shall be continuous and reasonably smooth.4.2 Dimensional,mechanicalproperty, and coating requirements4.2.1 GeneralThe following requirements shall apply to the wire before fabrication into strand.4.2.2 Wire diameter tolerance and roundn

48、ess requirementsEach zinc-coated wire shall not vary in diameter by more than the values shown in Table 1 and shall notvary in roundness by more than one-half the total permissible diameter tolerance when tested inaccordance with the requirements of Clause 11.1.1. Gauging of the wire shall be carrie

49、d out in areaswhere the zinc-coating is uniform.Table 1Diameter tolerances for zinc-coated steel wire(See Clauses 4.2.2 and 11.1.)Nominaldiameter of coated wire Permissiblediameter tolerancesIncluded Excluded Minus Plusmminmminmminmmin1.65 0.065 2.31 0.091 0.08 0.003 0.08 0.0032.31 0.091 3.07 0.121 0.10 0.004 0.10 0.0043.07and larger0.121and larger 0.13 0.005 0.13 0.0054.2.3 Tensile strength and elongationrequirementsThe tensile strength of the wire, based on the nominal wire diameter, and the elongation shall conformto the values in Tabl