Uyini usayizi wentambo wamafidi angama-30 amps angama-300?

Ukusebenzisa izintambo zikagesi ezinosayizi ofanele kumasekhethi kubalulekile ekuvimbeleni izingozi nokuvikela imililo. Lokhu kungenxa yokuthi lapho amandla edluliselwa ebangeni elide ngezintambo zethusi noma ze-aluminium, ukwehla kwamandla kagesi kungenzeka. Ngakho-ke, ukuze uqinisekise ukuphepha, kufanele usebenzise intambo efanele ochungechungeni lwakho lwamamitha angama-300.

Linda ngenkathi ngikukhombisa izibalo ezithile futhi ngikufundisa ukuthi yimaphi amasayizi wekhebula ongawasebenzisela ukufakwa okuzayo:

Udinga intambo engakanani kuma-amps angama-30? (80% ikhodi ye-NEC)

Kufanele usebenzise intambo ekwazi ukuphatha okungenani ama-amps angu-37.5. Ngakho-ke intambo engu-#8 AWG ekwazi ukuphatha ama-amps angu-50 iwucingo olufanele lwale ntambo yegatsha.

Ngivamise ukusebenzisa isibali sokwehla kwamandla kagesi noma imibandela Yekhodi Kagesi Kazwelonke (NEC) yegeji eyamukelekile yentambo engu-30 amp.

**Ngesekhethi engu-30-amp, awukwazi ukusebenzisa intambo kagesi engu-30A.

Akumele uze usebenzise intambo engu-#10 AWG 35A. Lokhu kungenxa yokuthi ubukhulu bomthwalo wentambo yesekethe yegatsha ngalinye ngu-80% wesilinganiso samanje sesekhethi kunoma yimuphi umthwalo. (NEC 220-2)

I-Pros iyibiza ngokuthi i-NEC voltage drop calculator ene-criterion yamandla engu-80%. Lokhu kubonisa ukuthi lawa ma-amps angu-30 akufanele amele ngaphezu kuka-80% womthwalo olinganiselwe wocingo (intambo yethusi noma i-aluminium).

Nansi indlela yokunquma ukuthi ingakanani intambo yamandla adingekayo kuphaneli kagesi engama-30 amp:

Ngokucabangela imfuneko ye-NEC engu-80%, ngikholwa ukuthi i-35A #10 AWG ayanele. Icishe ibe nkulu ngokwanele nge-35A, kodwa hhayi impela.

Sidinga ikhebula elingabamba okungenani ama-amps angu-37.5 ukuze sisebenzise iswishi engu-30 amp. Usayizi olandela intambo engu-#10 AWG (35A) ungusayizi wentambo engu-#8 AWG (50A).

Ngakho-ke, usayizi ofanelekile wentambo ye-30 amp circuit breaker iyintambo engu-#8 AWG, enesilinganiso samanje sama-amps angu-50.

Uyini usayizi wentambo wephaneli engaphansi engu-30ft 300 amp?

Uzodinga ucingo olukwazi ukuphatha okungenani ama-amps angama-60.

Ngakho-ke ukusebenzisa intambo engu-#6 AWG engabamba u-65A kuyintambo engcono kakhulu kuwe.

Ngizokufundisa ukuthi ngibale kanjani ngezansi.

Ukwehla kwamandla kagesi kwenzeka lapho ugesi udluliswa ngentambo yethusi engu-30 amp noma i-30 amp aluminium wire ebangeni. Ukwehla kwamandla kagesi kugcinwa ngaphansi kuka-3% ngaphansi kwamafidi ayi-10, ngakho-ke akudingekile ukuthi ukucabangele. (1)

Isibonelo, udinga ukulandisa ngokwehla kwamandla kagesi ku-50, 100, 200, noma 300 amafidi. Ngaphezu kwalokho, uzivumelanisa nalokhu ngokwandisa amandla amanje. Kodwa malini?

Ngokusho kwe-NEC 310-16, okwamanje kufanele kukhuliswe ngo-20% kuzo zonke izinyawo eziyi-100 ukusuka kuphaneli yezinsiza ezingama-30 amp.

Kalula nje, lokhu kusho ukuthi kufanele:

• Nyusa okwamanje ngo-10% kwentambo engu-30 amp ngamafithi angu-50 ukusuka kuphaneli yesisetshenziswa.
• Khulisa i-amperage ngo-20% ngezintambo ze-amp gauge ezingama-30 amafithi ayi-100 ukusuka kuphaneli engaphansi.
• Nyusa okwamanje ngo-40% kwentambo engu-30 amp ngamafithi angu-200 ukusuka kuphaneli yesisetshenziswa.
• Okokugcina, khulisa i-amperage ngo-60% kuntambo engu-30 amp amafithi angu-300 ukusuka kuphaneli yesisetshenziswa.

Okulandelayo kukhombisa indlela yokunquma amandla ama-amps angama-30 ukusuka kude:

Ake sithi udinga i-subpanel engamafidi angama-300 ukusuka ku-30 ​​amp mains.

Sesiyazi ukuthi ubuncane obungu-0 amps wamanje buyadingeka ezinyaweni ezingu-37.5. Ukuze uchaze izinyawo ezengeziwe ezingu-300 ukusuka kuphaneli yesisetshenziswa, kufanele ukhuphule okwamanje ngo-20% kuwo wonke amafidi angu-100 webanga. Ngakho-ke kufanele ukhuphule i-amperage ngo-60% ukuze uthole okwanele ngamamitha angu-300 wesekethe yakho.

Ngakho-ke, udinga umugqa okwazi ukuthwala okungenani ama-amps angama-60 wesekethe engu-30 amp ezinyaweni ezingama-300. Ngeshwa, #8 AWG wire current ingama-50A kuphela.

Kulesi simo, khetha intambo engu-#6 AWG eno-65A.

Bheka ezinye zezihloko zethu ngezansi.

• Imuphi usayizi wentambo wama-amps angama-30 amafidi angama-200
• Imuphi usayizi wocingo wama-amps angu-150?
• Lapho ungathola khona ucingo oluwugqinsi lwethusi lwezicucu

Izincomo

(1) ugesi - https://www.eia.gov/energyexplained/electricity/

(2) ithusi - https://www.livescience.com/29377-copper.html