TECHNICALTOPIC TTsystem s:rightwa - napitonline.com

8 NAPIT087 0 44 4 1392ww All anfo llowsupinq uir ies onthe NAPITH elplinean dlo oks indetailat thedemandsofBS76 71 onthis lin e ofworkPhase toearth faultPNPNP haseconductorNeutralconductorSupplytrans formerGroundlevelEarthelectrodeArrows indicate thepathof the fault currrentEarthconnectionblockNeutralconne ctionblockMeterConsumerunitEarthingcondu ctorTT supplyMainearthingterminal ( )MainearthingconductorEarthelectrodeMain equipotentialbondingconductorsItemof electricalequipmentP N N Pmainswitchwitha 100mA RCDincorporated30mA RCDFi g 1 TTsyst em s: ri ght waTEC HNI CA L TOPI CEnqu iries regardingelectricalin stallationsformingpart of TT sy stem s con tinu e to keep the NAPITT echn ic al Helplinebusy. We co vered the topicin agene ral way in last issu e sAsk Eddiebu t in thisartic le I ll go in to mo re detailan d reviewtherequ irem en ts of BS 7671 fo r suchinstal latio ns,answ erin g typicalqu estio ns in the temsElec tric al in stallations fo rm ing part of a TT systemare co mmonly fou nd in older pr oper ties and areasoflo w po pu latio n den sity an d may be suppliedbyove rh ead cab les or under gr ou nd earthispro vided fro m th e so ur ce of supplyandcon sequ ently , prem ises have their ow

8NAPIT 08704441392 www.napit.org.uk BillAllan followsup inquirieson theNAPIT Helplineand looksin detailatthe demandsof BS7671on thislineof work Phase to earth fault

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