Dab tsi yog cov hlau loj rau 30 amps 300 ko taw?

Kev siv cov xaim hluav taws xob loj kom raug rau cov kab hluav taws xob yog qhov tseem ceeb rau kev tiv thaiv kev phom sij thiab tiv thaiv hluav taws. Qhov no yog vim qhov tseeb tias thaum lub zog xa mus ntev los ntawm cov tooj liab lossis txhuas hlau, qhov hluav taws xob poob tuaj yeem tshwm sim. Yog li ntawd, txhawm rau kom muaj kev nyab xeeb, koj yuav tsum siv cov xaim kom raug rau koj 300 ko taw saw.

Tos thaum kuv qhia koj qee qhov kev suav thiab qhia koj seb qhov loj npaum li cas cable siv rau kev teeb tsa yav tom ntej:

Koj xav tau ntau npaum li cas xaim rau 30 amps? (80% NEC Code)

Koj yuav tsum siv cov xaim uas tuaj yeem ua haujlwm tsawg kawg 37.5 amps. Yog li #8 AWG hlau uas muaj peev xwm tuav tau 50 amps yog cov hlau zoo tagnrho rau cov ceg hlau no.

Kuv feem ntau siv lub ntsuas hluav taws xob poob qis lossis National Electrical Code (NEC) cov qauv rau kev lees txais 30 amp hlau ntsuas.

** Rau 30-amp Circuit Court, koj tsis tuaj yeem siv 30A hluav taws xob xaim.

Koj tsis tas yuav siv # 10 AWG 35A hlau, qhov no yog vim qhov siab tshaj plaws rau txhua ceg kab hluav taws xob xaim yog 80% ntawm qhov ntsuas tam sim no rau ib qho kev thauj khoom. (NWS 220-2)

Pros hu nws lub NEC voltage poob lub laij lej nrog 80% lub zog ntsuas. Qhov no qhia tau hais tias cov 30 amps no yuav tsum sawv cev tsis pub ntau tshaj 80% ntawm cov nqi ntsuas ntawm cov xaim (tooj liab hlau lossis txhuas).

Ntawm no yog yuav txiav txim siab npaum li cas ntawm cov xaim hluav taws xob koj xav tau rau 30 amp hluav taws xob vaj huam sib luag:

Xav txog 80% NEC qhov xav tau, Kuv ntseeg tias 35A #10 AWG tsis txaus. Nws yuav luag loj txaus nrog 35A, tab sis tsis heev.

Peb xav tau ib lub cable uas tuaj yeem ua haujlwm tsawg kawg 37.5 amps siv lub 30 amp hloov. Qhov loj tom qab #10 AWG (35A) hlau yog qhov loj ntawm #8 AWG (50A) hlau.

Yog li, qhov zoo tshaj plaws hlau loj rau 30 amp Circuit Court breaker yog # 8 AWG hlau, uas muaj qhov ntsuas tam sim no ntawm 50 amps.

Dab tsi yog cov hlau loj rau 30ft 300 amp subpanel?

Koj yuav xav tau ib lub xaim uas tuaj yeem ua haujlwm tsawg kawg 60 amps.

Yog li siv #6 AWG hlau uas tuaj yeem ua 65A yog qhov zoo tshaj plaws rau koj.

Kuv yuav qhia koj seb kuv xam nws li cas hauv qab no.

Ib qho hluav taws xob poob tshwm sim thaum hluav taws xob xa mus dhau 30 amp tooj liab xaim lossis 30 amp txhuas hlau hla qhov deb. Voltage poob yog khaws cia tsawg dua 3% ntawm tsawg dua 10 feet, yog li koj tsis tas yuav xav txog nws. (1)

Piv txwv li, koj yuav tsum tau them nyiaj rau qhov hluav taws xob poob ntawm 50, 100, 200, lossis 300 ko taw. Tsis tas li ntawd, koj hloov mus rau qhov no los ntawm kev nce lub zog tam sim no. Tab sis ntau npaum li cas?

Raws li NEC 310-16, tam sim no yuav tsum tau nce 20% rau txhua 100 ko taw los ntawm 30 amp accessory vaj huam sib luag.

Ua kom yooj yim, qhov no txhais tau tias koj yuav tsum:

• Nce qhov tam sim no los ntawm 10% rau 30 amp hlau 50 ko taw los ntawm cov khoom siv vaj huam sib luag.
• Nce amperage los ntawm 20% rau 30 amp gauge cables 100 ko taw los ntawm sub vaj huam sib luag.
• Nce qhov tam sim no los ntawm 40% rau 30 amp hlau 200 ko taw los ntawm cov khoom siv vaj huam sib luag.
• Thaum kawg, nce lub amperage los ntawm 60% rau 30 amp hlau 300 ko taw los ntawm cov khoom siv vaj huam sib luag.

Cov hauv qab no qhia yuav ua li cas txiav txim siab lub zog ntawm 30 amps los ntawm qhov deb:

Cia peb hais tias koj xav tau lub subpanel 300 ko taw los ntawm 30 amp mains.

Peb twb paub lawm tias qhov tsawg kawg nkaus ntawm 0 amps ntawm qhov tam sim no yuav tsum tau nyob ntawm 37.5 ko taw, txhawm rau txheeb xyuas qhov ntxiv 300 ko taw los ntawm cov khoom siv vaj huam sib luag, koj yuav tsum nce qhov tam sim no los ntawm 20% rau txhua 100 ko taw ntawm kev ncua deb. Yog li koj yuav tsum tau nce lub amperage los ntawm 60% kom txaus rau 300 ko taw ntawm koj lub voj voog.

Yog li ntawd, koj xav tau ib txoj kab uas muaj peev xwm nqa yam tsawg 60 amps rau 30 amp Circuit Court ntawm 300 ko taw. Hmoov tsis zoo, #8 AWG hlau tam sim no tsuas yog 50A.

Hauv qhov xwm txheej no, xaiv # 6 AWG hlau nrog 65A.

Ua tib zoo saib qee qhov ntawm peb cov lus hauv qab no.

• Yuav ua li cas loj hlau rau 30 amps 200 ko taw
• Dab tsi loj hlau rau 150 amps?
• Qhov twg mus nrhiav tuab tooj liab hlau rau seem

tswv yim pom zoo

(1) hluav taws xob - https://www.eia.gov/energyexplained/electricity/

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