Hauv av-fault circuit interrupters (GFCIs) tau siv rau ntau tshaj 40 xyoo, thiab tau ua pov thawj lawv tus kheej tsis muaj nuj nqis hauv kev tiv thaiv cov neeg ua haujlwm los ntawm kev phom sij ntawm hluav taws xob.Lwm hom kev xau tam sim no thiab cov khoom tiv thaiv hauv av tau raug qhia rau ntau yam kev siv txij li kev qhia txog GFCIs.Kev siv qee cov cuab yeej tiv thaiv tshwj xeeb yog xav tau hauv National Electrical Code® (NEC)®.Lwm tus yog ib feem ntawm cov khoom siv, raws li qhov yuav tsum tau ua los ntawm UL tus qauv npog cov khoom siv ntawd.Kab lus no yuav pab kom sib txawv ntawm ntau hom kev tiv thaiv uas siv niaj hnub no thiab qhia meej txog lawv qhov kev siv.
GFCI cov
Lub ntsiab lus ntawm qhov cuam tshuam hauv av tsis raug yog nyob rau hauv Tshooj 100 ntawm NEC thiab yog raws li hauv qab no: "Ib qho khoom siv rau kev tiv thaiv cov neeg ua haujlwm uas ua haujlwm rau de-energize ib lub voj voog lossis ib feem ntawm lub sijhawm tsim los ntawm lub sijhawm thaum tam sim no rau hauv av tshaj qhov muaj nqis tsim los rau Class A ntaus ntawv. "
Ua raws li cov ntsiab lus no, Daim Ntawv Ceeb Toom Qhia Txog Cov Lus Qhia ntxiv txog dab tsi ua rau Class A GFCI ntaus ntawv.Nws hais tias Chav Kawm A GFCI mus ncig thaum tam sim no mus rau hauv av muaj tus nqi nyob rau hauv thaj tsam ntawm 4 milliamps rau 6 milliamps, thiab siv UL 943, Tus Qauv rau Kev Nyab Xeeb rau Hauv av- Fault Circuit Court-Interrupters.
Tshooj 210.8 ntawm NEC suav nrog cov ntawv thov tshwj xeeb, ob qho tib si hauv tsev thiab kev lag luam, qhov twg GFCI kev tiv thaiv rau cov neeg ua haujlwm yuav tsum muaj.Hauv cov tsev nyob, GFCIs yuav tsum muaj nyob rau hauv tag nrho 125-volt, ib theem, 15- thiab 20-ampere receptacles ntsia rau hauv qhov chaw xws li chav dej, chav nres tsheb, sab nraum zoov, tsis tiav hauv qab daus, thiab chav ua noj.Tshooj 680 ntawm NEC npog cov pas dej da dej muaj cov cai GFCI ntxiv.
Hauv yuav luag txhua qhov tshiab ntawm NEC txij li xyoo 1968, GFCI cov cai tshiab tau ntxiv.Saib cov lus hauv qab no rau cov piv txwv ntawm thaum twg NEC thawj zaug xav tau GFCIs rau ntau daim ntawv thov.Thov nco ntsoov tias daim ntawv teev npe no tsis suav nrog txhua qhov chaw uas yuav tsum muaj kev tiv thaiv GFCI.
UL Phau Ntawv Qhia Cov Lus Qhia rau Av-Fault Circuit Interrupters (KCXS) tuaj yeem pom hauv UL Product iQ™.
Lwm Hom Kev Tiv Thaiv Tam Sim No thiab Hauv av Fault Protective Devices:
GFPE (Ground-Fault Protection of Equipment) - Lub hom phiaj rau kev tiv thaiv cov cuab yeej los ntawm kev tshem tawm tag nrho cov khoom siv hluav taws xob tsis sib haum ntawm lub voj voog nyob rau theem tam sim no tsawg dua li ntawm cov khoom siv hluav taws xob tiv thaiv overcurrent.Cov khoom siv no feem ntau yog tsim los rau kev mus ncig hauv 30 mA lossis ntau dua, thiab yog li tsis siv rau kev tiv thaiv cov neeg ua haujlwm.
Cov cuab yeej no tuaj yeem muab tau raws li NEC Tshooj 210.13, 240.13, 230.95, thiab 555.3.UL qhia cov ntaub ntawv rau Av-Fault Sensing thiab Relay Equipment tuaj yeem pom nyob rau hauv UL Khoom Qeb KDAX.
LCDI (Leakage Current Detector Interrupter) LCDI tau tso cai rau ib-theem cord- thiab plug-connected chav cua txias raws li Tshooj 440.65 ntawm NEC.LCDI fais fab mov qaum sib dhos siv cov hlua tshwj xeeb uas siv cov ntaub thaiv npog nyob ib puag ncig tus neeg xyuas pib, thiab tsim los cuam tshuam rau lub voj voog thaum muaj hluav taws xob tshwm sim ntawm tus neeg xyuas pib thiab cov ntaub thaiv npog.UL qhia cov ntaub ntawv rau Kev Tshawb Fawb Txog Tam sim no thiab cuam tshuam tuaj yeem pom nyob rau hauv UL Khoom Qeb ELGN.
EGFPD (Equipment Ground-Fault Protective Device) - Npaj rau cov ntawv thov xws li cov khoom siv hluav taws xob ruaj khov thiab cov khoom siv daus melting, nrog rau cov khoom siv hluav taws xob ruaj khov rau cov kav dej thiab cov hlab ntsha, raws li Tshooj 426 thiab 427 hauv NEC.Cov cuab yeej no ua haujlwm kom tsis txhob cuam tshuam cov hluav taws xob hluav taws xob los ntawm qhov chaw muab khoom thaum lub hauv av-fault tam sim no tshaj qhov av-them qhov chaw khaws cov cim ntawm lub cuab yeej, feem ntau 6 mA txog 50 mA.UL qhia cov ntaub ntawv rau Cov Khoom Siv Tiv Thaiv Hauv Pem Hauv Ntej tuaj yeem pom nyob rau hauv UL Khoom Qeb FTTE.
ALCIs thiab IDCIs
Cov khoom siv no yog UL Component Pom Zoo, thiab tsis yog rau kev muag khoom lossis siv.Lawv yog npaj rau kev siv raws li lub Hoobkas-sib dhos Cheebtsam ntawm cov khoom tshwj xeeb uas qhov haum ntawm lub installation yog txiav txim los ntawm UL.Lawv tsis tau raug tshawb xyuas rau kev teeb tsa hauv thaj chaw, thiab tej zaum yuav lossis tsis ua raws li cov cai hauv NEC.
ALCI (Appliance Leakage Current Interrupter) - Ib qho khoom siv ntawm cov khoom siv hluav taws xob, ALCIs zoo ib yam li GFCIs, vim tias lawv tau tsim los cuam tshuam rau hauv Circuit Court thaum lub hauv av txhaum tam sim no tshaj 6 mA.Ib qho ALCI tsis yog tsim los hloov kev siv GFCI ntaus ntawv, qhov twg GFCI yuav tsum muaj kev tiv thaiv raws li NEC.
IDCI (Immersion Detection Circuit Interrupter) - Ib qho khoom siv cuam tshuam uas cuam tshuam cov khoom siv hluav taws xob rau cov khoom siv hauv dej.Thaum cov kua hluav taws xob nkag mus rau hauv cov khoom siv thiab kev sib cuag ntawm ob qho tib si nyob thiab ib qho sensor sab hauv, cov cuab yeej mus ncig thaum tam sim no ntws ntawm qhov nyob thiab lub sensor tshaj qhov kev mus ncig tam sim no.Kev mus ncig tam sim no yuav yog ib qho nqi qis dua 6 mA txaus los kuaj xyuas cov khoom siv txuas nrog.Kev ua haujlwm ntawm IDCI tsis yog nyob ntawm qhov muaj cov khoom siv hauv av.
Post lub sij hawm: Sep-05-2022