Kumvetsetsa Zolakwa Zowonongeka ndi Chitetezo Chamakono Chotayikira

Ground-fault circuit interrupters (GFCIs) akhala akugwiritsidwa ntchito kwa zaka zoposa 40, ndipo atsimikizira kuti ndi ofunika kwambiri poteteza ogwira ntchito ku ngozi ya kugwedezeka kwa magetsi.Mitundu ina ya zida zodzitchinjiriza zapano komanso zodzitchinjiriza pansi zakhala zikugwiritsidwa ntchito mosiyanasiyana kuyambira kukhazikitsidwa kwa ma GFCI.Kugwiritsa ntchito zida zina zodzitetezera kumafunika makamaka mu National Electrical Code® (NEC)®.Zina ndi gawo la chipangizocho, monga momwe UL amafunira pa chipangizocho.Nkhaniyi ithandiza kusiyanitsa mitundu yosiyanasiyana ya zida zodzitetezera zomwe zimagwiritsidwa ntchito masiku ano ndikuwunikira zomwe akufuna.

Zithunzi za GFCI
Tanthauzo la wosokoneza madera apansi akupezeka mu Article 100 ya NEC ndipo ili motere: "Chida chomwe chimapangidwa kuti chiteteze anthu ogwira ntchito chomwe chimagwira ntchito yochepetsa mphamvu ya dera kapena gawo lake mkati mwa nthawi yomwe zapano mpaka pansi zimaposa zomwe zidakhazikitsidwa pa chipangizo cha Gulu A. ”

Kutsatira tanthauzoli, Chidziwitso Chachidziwitso chimapereka zambiri pazomwe zimapangidwira chipangizo cha Class A GFCI.Ikunena kuti Gulu la GFCI limayenda pamene mphamvu yapano mpaka pansi ili ndi mtengo wapakati pa ma milliamp 4 mpaka 6, ndi maumboni UL 943, Standard for Safety for Ground- Fault Circuit-Interrupters.

Ndime 210.8 ya NEC imakhudza ntchito zenizeni, zogona komanso zamalonda, pomwe chitetezo cha GFCI kwa ogwira ntchito chimafunikira.M'nyumba zogona, ma GFCI amafunikira muzotengera zonse za 125-volt, gawo limodzi, 15- ndi 20-ampere zoyikidwa m'malo monga mabafa, magalaja, panja, zipinda zapansi zosamalizidwa, ndi makhitchini.Ndime 680 ya NEC yophimba maiwe osambira ili ndi zofunikira zina za GFCI.

Pafupifupi m'magazini atsopano a NEC kuyambira 1968, zofunikira zatsopano za GFCI zinawonjezeredwa.Onani tebulo ili m'munsimu kuti mupeze zitsanzo za nthawi yomwe NEC idafuna ma GFCI pazogwiritsa ntchito zosiyanasiyana.Chonde dziwani kuti mndandandawu suphatikiza malo onse omwe chitetezo cha GFCI chikufunika.

UL Guide Information for Ground-Fault Circuit Interrupters (KCXS) ikupezeka mu UL Product iQ™.

Mitundu Ina Yazida Zodzitchinjiriza Zomwe Zilipo Panopa komanso Zotetezedwa:

GFPE (Ground-Fault Protection of Equipment) - Cholinga cha chitetezo cha zida pochotsa ma conductor onse opanda maziko a dera lomwe lilipo pakalipano kuposa la chipangizo chodzitchinjiriza chamagetsi.Chipangizo chamtunduwu chimapangidwa kuti chiziyenda pamtunda wa 30 mA kapena kupitilira apo, motero sichimagwiritsidwa ntchito poteteza anthu.

Mtundu uwu wa chipangizo ukhoza kuperekedwa monga momwe NEC Gawo 210.13, 240.13, 230.95, ndi 555.3 likufunira.Zambiri zowongolera za UL za Ground-Fault Sensing ndi Relay Equipment zitha kupezeka pansi pa UL Product Category KDAX.

Ma LCDI (Leakage Current Detector Interrupter) ma LCDI amaloledwa kukhala ndi zingwe zagawo limodzi ndi zoyatsira mpweya zolumikizidwa ndi pulagi molingana ndi Gawo 440.65 la NEC.Misonkhano yamagetsi yamagetsi ya LCDI imagwiritsa ntchito chingwe chapadera chogwiritsira ntchito chishango mozungulira oyendetsa payekha, ndipo amapangidwa kuti asokoneze dera pamene kutuluka kwapakati kumachitika pakati pa woyendetsa ndi chishango.Zambiri zowongolera za UL za Kutulukira-Pakalipano ndi Kusokoneza zitha kupezeka pansi pa UL Product Category ELGN.

EGFPD (Equipment Ground-Fault Protective Device) - Zopangira ntchito monga zida zamagetsi zokhazikika ndi zida zosungunula chipale chofewa, komanso zida zotenthetsera zamagetsi zamapaipi ndi zombo, molingana ndi Ndime 426 ndi 427 mu NEC.Chipangizochi chimagwira ntchito yochotsa gawo lamagetsi kuchokera kugwero lamagetsi pomwe mphamvu yapansi ipitilira mulingo wapadziko lapansi womwe walembedwa pa chipangizocho, nthawi zambiri 6 mA mpaka 50 mA.Zambiri zowongolera za UL za Ground-Fault Protective Devices zitha kupezeka pansi pa UL Product Category FTTE.

ALCIs ndi IDCIs
Zida izi ndi UL Component Imadziwika, ndipo sizinapangidwe kuti zigulidwe kapena kugwiritsidwa ntchito.Amapangidwa kuti azigwiritsidwa ntchito ngati zida zophatikizidwa ndi fakitale pazida zinazake pomwe kukwanira kwa kukhazikitsa kumatsimikiziridwa ndi UL.Sanafufuzidwe kuti akhazikitsidwe m'munda, ndipo atha kukwaniritsa kapena sangakwaniritse zofunikira mu NEC.

ALCI (Appliance Leakage Current Interrupter) - Chida chamagulu pazida zamagetsi, ALCIs ndi ofanana ndi GFCIs, chifukwa amapangidwa kuti asokoneze dera pamene vuto la nthaka likupitirira 6 mA.ALCI sinapangidwe kuti ilowe m'malo mwa kugwiritsa ntchito chipangizo cha GFCI, pomwe chitetezo cha GFCI chimafunikira molingana ndi NEC.

IDCI (Immersion Detection Circuit Interrupter) - Chida chamagulu chomwe chimasokoneza dera loperekera ku chipangizo chomizidwa.Pamene madzi a conductive alowa mu chipangizocho ndikulumikizana ndi gawo lamoyo ndi sensa yamkati, chipangizocho chimayenda pamene kutuluka kwapakati pakati pa gawo lamoyo ndi sensa kumaposa mtengo wamakono.Ulendo wapano ukhoza kukhala mtengo uliwonse pansi pa 6 mA wokwanira kuzindikira kumiza kwa chipangizo cholumikizidwa.Ntchito ya IDCI sikudalira kukhalapo kwa chinthu chokhazikika.