Iziphazamisi ze-Ground-fault circuit (GFCIs) sezineminyaka engaphezu kwengu-40 zisetshenziswa, futhi zibonakalise ukuthi ziwusizo olukhulu ekuvikelweni kwabasebenzi engozini yokushaqeka kukagesi.Ezinye izinhlobo zokuvuza kwemishini yamanje kanye neyokuvikela amaphutha aphansi yethulwe ezinhlelweni zokusebenza ezahlukahlukene kusukela kwethulwa ama-GFCI.Ukusetshenziswa kwamanye amadivaysi okuvikela kuyadingeka ngokukhethekile ku-National Electrical Code® (NEC)®.Ezinye ziyingxenye yento kagesi, njengoba kudingwa yizinga le-UL elimboza lolo mshini.Lesi sihloko sizosiza ukuhlukanisa izinhlobo ezahlukene zemishini yokuzivikela esetshenziswa namuhla futhi icacise ukusetshenziswa okuhlosiwe.
Iqembu le-GFCI
Incazelo yesiphazamisi sesekethe esinephutha eliphansi itholakala ku-Athikili 100 ye-NEC futhi imi kanje: “Idivayisi ehloselwe ukuvikela abasebenzi esebenza ukukhipha amandla isekethe noma ingxenye yayo phakathi nesikhathi esimisiwe lapho i-current to ground idlula amanani asungulelwe idivayisi ye-Class A."
Ukulandela le ncazelo, Inothi Lolwazi lihlinzeka ngolwazi olwengeziwe lokuthi yini eyakha idivayisi ye-GFCI Yekilasi A.Ithi Ikilasi A GFCI liyahamba lapho okwamanje ukuya phansi kunevelu kububanzi obungu-4 milliamp ukuya ku-6 milliamp, kanye nezinkomba UL 943, Izinga Lokuphepha Le-Ground- Fault Circuit-Interrupters.
Isigaba 210.8 se-NEC sifaka izicelo ezithile, kokubili ezokuhlala nezohwebo, lapho kudingeka khona ukuvikelwa kwe-GFCI kwabasebenzi.Ezindaweni zokuhlala, ama-GFCI ayadingeka kuwo wonke ama-volt angu-125, isigaba esisodwa, i-15- kanye ne-20-ampere yezimpahla ezifakwe ezindaweni ezifana namagumbi okugeza, amagaraji, ngaphandle, amagumbi angaphansi angaqediwe, namakhishi.I-athikili 680 ye-NEC ehlanganisa amachibi okubhukuda inezidingo ezengeziwe ze-GFCI.
Cishe kuzo zonke izinguqulo ezintsha ze-NEC kusukela ngo-1968, izidingo ezintsha ze-GFCI zengezwa.Bheka ithebula elingezansi ukuze uthole izibonelo zokuthi i-NEC iwadinga nini okokuqala ama-GFCI kuzinhlelo zokusebenza ezihlukahlukene.Sicela uqaphele ukuthi lolu hlu alufaki zonke izindawo lapho kudingeka khona ukuvikelwa kwe-GFCI.
Ulwazi Lwe-UL Lomhlahlandlela Lweziphazamisi Zesekethe Eziphansi (KCXS) lungatholakala ku-UL Product iQ™.
Ezinye Izinhlobo Zamadivayisi Amanje Avuzayo Naphansi Okuvikela Iphutha:
I-GFPE (I-Ground-Fault Protection of Equipment) — Ihloselwe ukuvikela okokusebenza ngokunqamula amakhondaktha angenasisekelo esekethe emazingeni amanje angaphansi kwalelo lesekhethi yokunikezela ngesivikelo esidlule.Lolu hlobo lwedivayisi ngokuvamile ludizayinelwe ukuthi luhambe ngebanga elingu-30 mA noma ngaphezulu, ngakho alusetshenziselwa ukuvikela abasebenzi.
Lolu hlobo lwedivayisi lungahlinzekwa njengoba kudingwa yi-NEC Izigaba 210.13, 240.13, 230.95, kanye no-555.3.Ulwazi lomhlahlandlela we-UL lwe-Ground-Fault Sensing kanye ne-Relay Equipment ingatholakala ngaphansi Kwesigaba Somkhiqizo we-UL KDAX.
Ama-LCDI (I-Leakage Current Detector Interrupter) Ama-LCDI avunyelwe ama-airconditioner egumbi lesigaba esisodwa sentambo kanye nepulaki ngokuhambisana neSigaba 440.65 se-NEC.Imihlangano ye-LCDI yentambo yokunikezwa kwamandla isebenzisa intambo ekhethekile esebenzisa isihlangu ezungeze abaqhubi ngabanye, futhi iklanyelwe ukuphazamisa umjikelezo lapho ukuvuza kwamanje kwenzeka phakathi komqhubi nesihlangu.Ulwazi lomhlahlandlela we-UL Lokutholwa Okuvuzayo-Kwamanje Nokuphazamiseka lungatholakala ngaphansi Kwesigaba Somkhiqizo we-UL ELGN.
I-EGFPD (Idivaysi Evikela Iphutha Eliphansi) — Ihloselwe izinhlelo zokusebenza ezifana ne-fixed electric deicing kanye nempahla yokuncibilikisa iqhwa, kanye nezinto zokushisisa zikagesi ezingashintshi zamapayipi nemikhumbi, ngokuvumelana ne-Athikili 426 kanye ne-427 ku-NEC.Lolu cingo lusebenza ukuze lunqamule isekethe kagesi emthonjeni womthombo lapho amandla asebenza phansi edlula izinga lokuthathwa kwephutha eliphansi elimakwe kudivayisi, ngokuvamile engu-6 mA kuya ku-50 mA.Ulwazi lomhlahlandlela we-UL lwamadivayisi okuvikela aphansi-Fault lungatholakala ngaphansi kwesigaba somkhiqizo we-UL FTTE.
Ama-ALCI kanye nama-IDCI
Lawa madivayisi ayi-UL Component Eyaziwayo, futhi awahloselwe ukuthengiswa okuvamile noma ukusetshenziswa.Zihloselwe ukusetshenziswa njengezingxenye ezihlanganiswe efekthri zemishini ethile lapho ukufaneleka kokufakwa kunqunywa yi-UL.Aziphenywanga ukuze zifakwe kulo mkhakha, futhi zinganelisa noma zingagculisi izidingo ku-NEC.
I-ALCI (I-Appliance Leakage Current Interrupter) — Idivayisi eyingxenye yezinto zikagesi, ama-ALCI afana nama-GFCI, njengoba aklanyelwe ukuphazamisa ukujikeleza lapho amandla angaphansi komhlaba edlula u-6 mA.I-ALCI ayihloselwe ukumiselela ukusetshenziswa kwedivayisi ye-GFCI, lapho kudingeka khona ukuvikelwa kwe-GFCI ngokuvumelana ne-NEC.
I-IDCI (I-Immersion Detection Circuit Interrupter) — Idivayisi yengxenye ephazamisa umjikelezo wokunikezela kumshini ocwilisiwe.Uma uketshezi lwe-conductive lungena entweni futhi luthinta kokubili ingxenye ephilayo kanye nenzwa yangaphakathi, idivayisi iyanyakaza lapho ukugeleza kwamanje phakathi kwengxenye ebukhoma nenzwa kudlula inani lamanje lohambo.Amandla ohambo angase abe yinoma yiliphi inani elingaphansi kuka-6 mA elanele ukuthola ukucwiliswa kwento esebenzayo exhunyiwe.Umsebenzi we-IDCI awuncikile ebukhoneni bento esekelwe phansi.
Isikhathi sokuthumela: Sep-05-2022