SANS 10142-2_2009 Electrical Installations 1-22kV Upto 3MVA

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SANS 10142-2_2009 Electrical Installations 1-22 kV up to 3 MVA
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  ~ ..ã , ;.., ã , r ~ Y - : ! 1 ISBN978-0-626-22425-7 SANS10142-2:2009 Edition1 SOUTHAFRICANNATIONALSTANDARD Part 2: Medium-voltageinstallationsabove1kVa.c.notexceeding22kVa.c.anduptoandincluding3000kWinstalledcapacityThewiring of premises Published by SABSStandardsDivision 1 DrLateganRoadGroenkloof ~ PrivateBag X191 Pretoria 0001 Tel: +27 12428 7911 Fax:+27123441568 www.sabs.co.z3@SABS SASS  Introduction SANS10142-2:2009 Edition1 Thepurpose of thisdocumentisto prOVide,in aconvenientform,commonrulesforthesafety of specific,fixed, MV electricalinstallations in systemswithnominalvoltagesabove1kV(1,5kVd.c.)notexceeding 22 kVa.c.anduptoandincluding3 000 kW installedcapacity.(Allparts of thefinal MV installationbeloW1kVarecoveredbytherequirements of SANS10142-1.)ThisdocumentcontainsminimumreqUirementsandadditionalinformationwithregardtothesafeoperation,andtoensureacceptablereliability, of themedium-voltagepart of anelectricalinstallation.Thisdocumentcoversthesystemengineeringanderection,particularlyconcerningthesafetyaspects, of thesaidelectricalpowerinstallations.InstallationsandeqUipmentwillbecapable of withstandingtheelectrical,mechanical,climaticandenvironmentalinfluencesanticipated on site. ScopeTable of changes ThisSouthAfricanstandardwasapprovedbyNationalCommitteeSABS SC 67F, Electricitydistributionsystems and components - Installations, inaccordancewithprocedures of theSASSStandardsDivision,incompliancewithannex 3 of the WTOfTBT agreement.Referenceismadein 3.1.2. in 3.8.3 and in A.4.2 to relevantauthority . In SouthAfrica,thereference in 3.1.2 istotheNationalEnergyRegulator of SouthAfrica(NERSA),in 3.8.3 thereferenceistotheEngineeringCouncilofSouthAfrica(ECSA)andin A.4.2 thereferenceistotheCommission of ExaminersfortheGovernmentCertificate of Competency.Referenceismade in 3.8.5,3.8.6,5.10.10,6.10,9.1.1 and 10.1 to legislation InSouthAfricathisistheOccupationalHealthandSafetyAct,1993(ActNo.85 of 1993)(asamendedfromtimetotime).Referenceismadein 4.1.1 to SouthAfricanlegislation ll ã In SouthAfricathisisthesaidOccupationalHealthandSafetyActandtheelectricalinstallationrequirementswhereapplicabletomedium-voltageelectricalinstallations,promUlgatedinterms of theAct.Referenceismade in 5.4.2 and 5.5.3 tothe ElectricalMachineryRegulations .InSouthAfricathisisthesaidOccupationalHealthandSafety Act andtheElectricalMachineryRegUlationspromulgatedinterms of theAct.ThisdocumentwaspublishedinMarch 2009. SANS 10142 consists of thefollowingparts,underthegeneraltitle Thewiring of premises: Part 1: Low-voltageinstallations.Part 2: Medium-voltageinstallationsabove 1 kVa.c. notexceeding 22 kV a.c. and up to and including 3 000 kW installedcapacity. AnnexBformsanintegralpart of thedocument.AnnexAisforinformationonly. I ChangeNo, I Date Foreword  ã r , : ~ . SANS10142-2:2009 Edition1 In terms of theOccupationalHealthandSafety Act, 1993(Act No. 85 of 1993),theprovisions of thispart of SANS10142applyonlyfromthepointofcontroltothepoint of consumption.Becausethisdocumentiscontinuallyupdated,problems can ariseonwhichversion of thestandardwillbeapplicablewhenacontractissigned.Thedateofapproval of thelatestrevision or amendment of thisdocumentwill be theimplementationdate of therevisionortheamendment.Theapplicableversion of thisdocumentistheonewiththelatestimplementationdatebeforethecontractdate.Socontractssignedbeforetheapproval of anamendmenthavetobecarriedoutinaccordancewiththeprovisions of theunamendedstandard.If an existinginstallationisextended or altered,suchextensionoralterationisreqUiredtocomplywiththeprovisions of thisdocumentthatwereapplicableatthetime of erection of theextensionoralteration.Theedition of thestandardthatwasapplicable at thedate of erection of anelectricalinstallationistobeconsideredtheeditiondefiningtherequirementsapplicabletothatparticularelectricalinstallation. 1 SANS 10142-1 Org.132 L---+f--'- LV eqUipment in publicplaces t-----tt-- ............ ------- ) - - - - - + ~ _ ............ _------ 1--.....,...--1+-- ........... ------- V/HV/EHV Eskom/Municipalities SANS 10142-2 Consumer rating .. 3 000 kW @ c 22 kV Consumer rating ~ 3 MV @ ~ 1 kV Figure1-Fields of electricaltransmissionanddistributionwithspecificreference to theapplicability of thisdocument Thesinglelinediagramgiven in figure1depictstypicaldistributionscenarioscoveredbythisdocumentwithspecificreferencetoMVinstallations.  SANS10142-2:2009 Edition 1 Contents Page Foreword Introduction 1Scope 5 2Normativereferences .,,. 5 2.1 South African standards.............................................................................................. 5 2.2IEC standards ,, ,. 9 3 Definitions , ' .. , ,. 10 4Compliance164.1 Statutory requirements , 16 4.2Safety Report............................................................................................................... 164.3Applicable standards ,. 164.4 Notices, labels andrating plates.................................................................................. 195 Design 20 5.1 Electrical design 205.1.1General. , ,. 20 5.1.2Prospective short-circuit rating 20 5.1.3Overhead structures...................................................................................... 21 5.1.4Transformers 21 5.1.5Metal-enclosedswitchgear ,. 225.1.6 Batteries and chargers225.1.7Power cables,conductorsand accessories.225.1.8Surgearresters , 235.1.9Overhead isolators, sectionalizers and reclosers .. 235.1.10Generator sets , 23 5.1.11Power capacitors........................................................................................... 235.1.12 Outdoor insulators 245.1.13 Insulation co-ordination ,. 24 5.2Mechanical design , ,. 245.3 Earthing ' , ' ,. 24 5.4 BUildings and enclosures ,, 25 5.5Clearance distances ., ,. ' , 255.5.1General ,. 25 5.5.2Barrierclearances(Under consideration) 265.5.3Power line clearances.265.6Extemal fences,walls, access doorsandbarriers ,. 26 5.7Climatic and environmental conditions. 27 5.8 Electrical protectionsystems , 27 5.9 AUdible noise levels , ,. 285.10Notices andlabelling , 28 6 Installation ,. 29 6.1Existinginstallations ., ,. 296.2 Installation ofa neutralearthand bonding 306.3 Installation ofoverhead structures ' 306.4 Installation of transformers ,. 30 2
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