Video: Yuav ua li cas yog conduit filling NEC xam?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Nrhiav yam tsawg kawg nkaus muaj kav dej cheeb tsam
Lub Tebchaws Hluav taws xob Code tsim tias yog a kav dej tsuas muaj 1 hlau , max puv feem pua yog 53%. Yog hais tias nws muaj 2 xov hlau, qhov max puv feem pua yog 31%. Thiab yog hais tias nws muaj 3 los yog ntau tshaj xov hlau, qhov max puv feem pua yog 40%.
Tsuas yog li ntawd, NEC code rau conduit sau yog dab tsi?
Cov NEC index cross-references " tub lim "as neeg xyuas pib . Qhov yooj yim NEC cov ntaub ntawv yog 300.17. Cov NEC tsis muab qhov tshwj xeeb puv tooj, tu. Nws tsuas yog hais tias tus naj npawb thiab qhov loj ntawm cov conductors tsis tuaj yeem muaj ntau tshaj qhov yuav tso cai rau cov cua sov thiab qhov kev npaj tshem tawm ntawm cov conductors yam tsis muaj kev puas tsuaj rau lawv.
Kuj Paub, qhov feem pua ntawm cov raj xa dej yuav tsum tau ua? Nrhiav yam tsawg kawg nkaus muaj kav dej cheeb tsam National Electrical Code tsim kom muaj tias yog a kav dej tsuas muaj 1 xaim, qhov max sau feem pua yog 53%. Yog hais tias nws muaj 2 xov hlau, qhov max sau feem pua yog 31%. Thiab yog hais tias nws muaj 3 los yog ntau tshaj xov hlau, qhov max sau feem pua yog 40%.
Tom qab ntawd, lo lus nug yog, muaj pes tsawg cov xov hlau tuaj yeem nyob hauv daim ntawv qhia kab dej?
Tso cai Conduit Fill Capacities
| Loj thiab Hom Conduit | 14 AWG | 10 AWG Wire |
|---|---|---|
| 3/4 nti EMT | 22 | 10 |
| 1 nti EMT | 35 | 16 |
| 1 1/2-nti EMT | 84 | 38 |
| 1/2-nti PVC-Sch 40 | 11 | 5 |
Puas yog lub raj xa dej muaj xws li hauv av xaim?
Yog li yog, nws yog a hauv av "conductor" (as opposed to ib insulator). Thawj yog tub lim --cov khoom siv hauv av tus neeg xyuas pib raug suav vim nws siv qhov chaw. Qhov thib ob yog de-rating rau tam sim no nqa tus neeg xyuas pib - cov khoom siv hauv av tus thawj coj ua tsis suav vim nws tsis yog tus neeg nqa khoom tam sim no.
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