Iziphazamisi zeesekethe eziphantsi komhlaba (GFCIs) zisetyenziswe iminyaka engaphezu kwama-40, kwaye zibonakalise ukuba zixabiseke kakhulu kukhuseleko lwabasebenzi kwingozi yomothuko wombane.Ezinye iintlobo zokuvuza kwangoku kunye nezixhobo ezikhusela impazamo emhlabeni ziye zaziswa kwizicelo ezahlukeneyo ukususela ekuqalisweni kwe-GFCIs.Ukusetyenziswa kwezinye izixhobo zokukhusela zifunwa ngokukodwa kwi-National Electrical Code® (NEC)®.Ezinye ziyinxalenye yesixhobo, njengoko kufunwa ngumgangatho we-UL ogubungela eso sixhobo.Eli nqaku liza kunceda ukuhlula iintlobo ezahlukeneyo zezixhobo zokukhusela ezisetyenziswayo namhlanje kwaye zicacise ukusetyenziswa kwazo.
IiGFCI's
Inkcazo ye-ground-fault circuit interrupter ifumaneka kwiSiqendu 100 se-NEC kwaye imi ngolu hlobo lulandelayo: “Isixhobo esijolise ekukhuseleni abasebenzi esisebenza ukususa amandla kwisekethe okanye inxalenye yayo ngexesha elimisiweyo xa yangoku ukuya emhlabeni idlula amaxabiso amiselwe kwisixhobo soDidi A.”
Ukulandela le ngcaciso, iNgcaciso yoLwazi ibonelela ngolwazi olongezelelweyo malunga nokuba yintoni na eyenza isixhobo se-GFCI yoKlasi.Ichaza ukuba iKlasi ye-GFCI ihamba xa i-current ukuya emhlabeni inexabiso kuluhlu lwe-4 milliamps ukuya kwi-6 milliamps, kunye neereferensi ze-UL 943, uMgangatho woKhuseleko lwe-Ground-Fault Circuit-Interrupters.
Icandelo 210.8 le-NEC libandakanya izicelo ezithile, zombini indawo yokuhlala kunye nezorhwebo, apho ukhuseleko lwe-GFCI lwabasebenzi lufuneka khona.Kwiiyunithi zokuhlala, ii-GFCIs ziyafuneka kuzo zonke ii-125-volt, isigaba esinye, i-15- kunye ne-20-ampere yezixhobo ezifakwe kwiindawo ezifana nezindlu zangasese, iigaraji, ngaphandle, amagumbi angaphantsi angagqitywanga, kunye namakhitshi.Inqaku lama-680 le-NEC eligubungela amadama okuqubha lineemfuno ezongezelelweyo ze-GFCI.
Phantse kulo lonke uhlelo olutsha lwe-NEC ukususela ngo-1968, iimfuno ezintsha ze-GFCI zongezwa.Jonga le theyibhile ingezantsi ngemizekelo yokuba i-NEC yaqala nini ukuzifuna ii-GFCIs kwizicelo ezahlukeneyo.Nceda uqaphele ukuba olu luhlu alubandakanyi zonke iindawo apho kufuneka ukhuseleko lwe-GFCI.
Ulwazi lwe-UL yesiKhokelo se-Ground-Fault Circuit Interrupters (KCXS) inokufumaneka kwi-UL Product iQ™.
Ezinye iindidi zokuvuza kwangoku kunye neziXhobo zoKhuseleko ezikwiFault:
GFPE (Ground-Fault Protection of Equipment) — Yenzelwe ukukhuselwa kwezixhobo ngokuqhawula zonke iiconductor ezingafakwanga phantsi zesekethe kumanqanaba akhoyo angaphantsi kwaleyo yonikezelo lwesekethe yesixhobo sokhuselo esigqithileyo.Olu hlobo lwesixhobo luyilelwe ukuba luhambe kuluhlu lwe-30 mA okanye olungaphezulu, kwaye ke ngoko alusetyenziselwa ukhuseleko lwabasebenzi.
Olu hlobo lwesixhobo lunokubonelelwa njengoko lufunwa yi-NEC yamaCandelo 210.13, 240.13, 230.95, kunye no-555.3.Ulwazi lwe-UL yesikhokelo se-Ground-Fault Sensing kunye ne-Relay Equipment inokufunyanwa phantsi koluhlu lweMveliso ye-UL KDAX.
I-LCDI (i-Leakage Current Detector Interrupter) ii-LCDI's zivumelekile kwisigaba esinye-kunye ne-plug-connected room air conditioners kunye ne-plug-connected room conditioners ngokungqinelana neCandelo 440.65 le-NEC.Iindibano zentambo zobonelelo lwamandla eLCDI zisebenzisa intambo ekhethekileyo esebenzisa ikhaka elijikeleze abaqhubi ngabanye, kwaye zenzelwe ukuphazamisa isiphaluka xa ukuvuza kwangoku kwenzeka phakathi komqhubi kunye nekhaka.Ulwazi lwe-UL yesikhokelo sokuBonelwa kwe-Leakage-Yangoku kunye nokuphazamiseka inokufumaneka phantsi kweCandelo leMveliso ye-UL ye-ELGN.
I-EGFPD (i-Equipment Ground-Fault Protective Device) - Yenzelwe izicelo ezifana ne-fixed electric deicing kunye nezixhobo zokunyibilika kwekhephu, kunye nezixhobo zokufudumeza zombane ezisisigxina kwimibhobho kunye neenqanawa, ngokuhambelana neNqaku 426 kunye ne-427 kwi-NEC.Esi sixhobo sisebenza ukuze siqhawule isekethe yombane ukusuka kumthombo wonikezelo xa umsinga ophantsi komhlaba ugqitha inqanaba lokuchola lombane eliphawulwe kwisixhobo, ngokuqhelekileyo yi-6 mA ukuya kwi-50 mA.Ulwazi lwe-UL yesikhokelo seZixhobo zoKhuseleko eziGround-Fault zinokufunyanwa phantsi koluhlu lweMveliso ye-UL FTTE.
Ii-ALCI kunye nee-IDCIs
Ezi zixhobo ziyi-UL Component Eyaziwayo, kwaye ayenzelwanga ukuthengiswa ngokubanzi okanye ukusetyenziswa.Zenzelwe ukusetyenziswa njengamacandelo adityaniswe ngumzi-mveliso wezixhobo ezithile apho ukufaneleka kofakelo kugqitywe yi-UL.Abakhange baphandwe ngokufakela kwintsimi, kwaye banokwanelisa okanye banganelisi iimfuno kwi-NEC.
I-ALCI (I-Appliance Leakage Current Interrupter) - Isixhobo secandelo kwizixhobo zombane, ii-ALCI zifana ne-GFCIs, njengoko zenzelwe ukuphazamisa isiphaluka xa i-fault current current idlula i-6 mA.I-ALCI ayenzelwanga ukutshintsha ukusetyenziswa kwesixhobo se-GFCI, apho ukhuseleko lwe-GFCI lufuneka ngokuhambelana ne-NEC.
I-IDCI (I-Immersion Detection Circuit Interrupter) - Isixhobo secandelo eliphazamisa isiphaluka sonikezelo kwisixhobo esintywilisiweyo.Xa i-liquid conductive ingena kwisixhobo kwaye idibanisa zombini inxalenye ephilayo kunye nenzwa yangaphakathi, isixhobo sihamba xa ukuhamba kwangoku phakathi kwendawo ephilayo kunye nenzwa idlula ixabiso langoku lohambo.Uhambo lwangoku lunokuba nalo naliphi na ixabiso elingaphantsi kwe-6 mA elanele ukubona ukuntywiliselwa kwesixhobo esiqhagamshelweyo.Umsebenzi we-IDCI awuxhomekeke kubukho bento esekelwe phantsi.
Ixesha lokuposa: Sep-05-2022