Cov teeb meem tau tshwm sim nrog qee qhov kev xav tau tshiab hauv NFPA 70®, National Electrical Code® (NEC®), ntsig txog GFCI kev tiv thaiv rau cov tsev nyob.Kev hloov kho lub voj voog rau xyoo 2020 ntawm NEC suav nrog kev nthuav dav tseem ceeb ntawm cov kev cai no, uas tam sim no txuas ntxiv suav nrog cov khoom siv hluav taws xob mus txog 250V ntawm cov ceg hluav taws xob ntsuas 150V rau hauv av lossis tsawg dua, nrog rau tag nrho hauv qab daus (ua tiav lossis tsis tiav) thiab tag nrho sab nraum zoov cov khoom siv (receptacle los tsis).Tsis muaj qhov tsis ntseeg tias tus neeg soj ntsuam muaj lub luag haujlwm tseem ceeb los xyuas kom meej tias cov kev xav tau pom hauv 210.8 raug siv kom raug.
Nws tsim nyog rov xyuas vim li cas cov kev hloov kho no tau ua thawj zaug.GFCI cov kev cai feem ntau xav tau cov laj thawj tseem ceeb hauv kev ua kom cov cai tsim vaj huam sib luag ntxiv cov cuab yeej tshiab, khoom siv, lossis thaj chaw rau daim ntawv.Thaum lub sijhawm kho dua tshiab rau 2020 NEC, ntau qhov kev tuag tsis ntev los no tau nthuav tawm vim li cas peb xav tau nthuav dav GFCI kev tiv thaiv rau cov neeg hauv tsev.Piv txwv suav nrog tus neeg ua haujlwm uas raug hluav taws xob los ntawm lub zog ntawm lub zog ntawm qhov tsis xws luag;tus me nyuam uas raug hluav taws xob thaum nkag mus tom qab lub tshuab ziab khaub ncaws nrhiav nws tus miv;thiab ib tug tub hluas uas ib txhij tuaj sib cuag nrog lub zog AC condensing chav tsev thiab ib lub laj kab txuas hauv av thaum nws hla ib tus neeg nyob ze lub vaj ntawm nws txoj kev mus tsev noj hmo.Cov xwm txheej txaus ntshai no tuaj yeem tiv thaiv tau GFCI yog ib feem ntawm qhov sib npaug.
Ib lo lus nug uas twb tau tsa nyob rau hauv kev sib raug zoo rau 250V qhov yuav tsum tau yog yuav ua li cas nws yuav cuam tshuam rau ntau yam receptacle.Cov kev cai rau kev tiv thaiv GFCI hauv chav ua noj tsis yog tshwj xeeb raws li lawv nyob hauv cov neeg nyob tsis muaj tsev.Ua ntej, receptacles ntsia rau hauv chav ua noj countertops yuav tsum tau GFCI tiv thaiv.Qhov no tsis tshua siv rau ntau qhov chaw txais khoom, vim tias cov no tsis feem ntau ntsia ntawm qhov siab countertop.Txawm hais tias lawv yog, txawm li cas los xij, cov ntaub ntawv tuaj yeem ua tau tias cov chaw txais khoom muaj nyob ntawd los ua haujlwm rau ntau yam thiab tsis muaj dab tsi ntxiv.Lwm daim ntawv teev cov khoom hauv 210.8(A) uas yuav xav tau GFCI kev tiv thaiv rau ntau qhov chaw txais khoom yog dab dej, qhov twg qhov chaw txais khoom tau teeb tsa nyob rau hauv 6 ko taw ntawm sab saum toj sab hauv ntug ntawm lub dab dej.Qhov chaw txais khoom yuav tsuas xav tau GFCI kev tiv thaiv yog tias nws tau teeb tsa hauv thaj tsam 6-ko taw.
Txawm li cas los xij, muaj lwm qhov chaw nyob hauv ib lub tsev uas qhov teeb meem yog qhov yooj yim dua me ntsis, xws li qhov chaw ntxhua khaub ncaws.Tsis muaj qhov kev ncua deb ntawm cov chaw no: yog tias lub chaw txais khoom tau teeb tsa hauv chav ntxhua khaub ncaws / cheeb tsam, nws yuav tsum muaj kev tiv thaiv GFCI.Yog li ntawd, cov tshuab ziab khaub ncaws tam sim no yuav tsum tau tiv thaiv GFCI vim tias lawv nyob hauv qhov chaw ntxhua khaub ncaws.Tib yam muaj tseeb rau hauv qab daus;rau xyoo 2020 tsab, cov cai tsim vaj huam sib luag tau tshem tawm cov kev tsim nyog "tsis tiav" los ntawm hauv qab daus.Lub chaw nres tsheb yog lwm qhov chaw uas yog tag nrho-encompassing, ib yam nkaus, txhais tau hais tias cov vuam, cua compressors, thiab lwm yam khoom siv hluav taws xob lossis khoom siv uas koj yuav pom hauv lub nkas-las yuav xav tau kev tiv thaiv GFCI yog tias lawv txuas txuas txuas.
Thaum kawg, qhov kev nthuav dav GFCI tau txais kev sib tham feem ntau yog qhov sib ntxiv ntawm cov chaw tawm sab nraud.Daim ntawv ceeb toom kuv tsis tau hais tias "cov chaw txais khoom sab nraum zoov" - cov uas twb tau them lawm.Qhov kev nthuav dav tshiab no txuas ntxiv mus rau cov cuab yeej siv hluav taws xob zoo ib yam, tshwj tsis yog cov khoom siv daus-kua thiab cov teeb pom kev zoo.Qhov no txhais tau hais tias chav tsev condenser rau lub tshuab cua txias yuav tsum muaj kev tiv thaiv GFCI, ib yam nkaus.Thaum qhov kev xav tau tshiab no tau pib ua tiav hauv kev teeb tsa tshiab, nws tau pom meej sai sai tias muaj qhov teeb meem nrog qee qhov kev sib cais me me uas siv cov khoom siv hluav taws xob hloov pauv los tswj qhov ceev ntawm lub compressor thiab tuaj yeem ua rau random tripping ntawm GFCI tiv thaiv. .Vim li no, NEC tab tom ua qhov Tentative Interim Amendment ntawm 210.8(F) txhawm rau ncua kev siv rau cov kab ke me me no kom txog rau thaum Lub Ib Hlis 1, 2023. Qhov TIA tam sim no nyob rau hauv cov lus tawm tswv yim ua ntej nws rov qab mus rau committee rau kev txiav txim siab thiab kev nqis tes ua.TIA ua kom pom tseeb tias pawg neeg tseem txhawb nqa kev tiv thaiv ntawm cov chaw muag khoom no, tab sis tsuas yog nrhiav kev muab kev lag luam qee lub sijhawm los tsim kev daws teeb meem rau qhov tshwj xeeb no.
Nrog rau tag nrho cov kev hloov pauv tseem ceeb no rau GFCI cov cai, nws yuav luag tuaj yeem lees paub tias 2023 kev hloov kho lub voj voog yuav pom kev ua haujlwm ntau ntxiv nyob ib puag ncig cov cuab yeej cawm txoj sia.Kev ua kom nrawm nrog kev sib tham yuav tsis tsuas yog pab cov txheej txheem hloov kho tshiab xwb, nws tseem yuav ua rau NEC tau txais kev lees paub hauv ntau lub tebchaws thoob tebchaws.
Post lub sij hawm: Sep-22-2022