Peb feem ntau pom 6 3 romex hlau , 10 2 romex hlau, 12 2 250 ft romex, 6 3 nm b, romex 10 3, 12 2 nrog av romex ,nm b 8 3,4 3 nm b xaim cov ntawv no hauv xov hlau thiab cables, yog li lawv txhais li cas? Qhov tseeb, cov no yog qee cov qauv ntawm Asmeskas tus qauv nm b xov hlau.
Lub ntsiab lus ntawm nm yog non-metallic, thiab B txhais tau tias lub tsev hlau
NM-B hlau yog ib qho American standard ca cable tshwj xeeb uas tsim los siv nyob rau hauv mobile chav ua lub qhov (socket) thiab hloov. Lub cable no tsis tsuas yog ua raws li AWG specifications, tab sis kuj yuav tsum tau UL719 ntawv pov thawj rau nm b hlau los xyuas kom meej nws kev nyab xeeb thiab kev ntseeg tau. Kev siv cov xov hlau NM-B, tshwj xeeb tshaj yog nyob rau hauv cov tsev nyob, tuaj yeem ua tau raws li cov kev xav tau ntawm cov khoom siv hluav taws xob thiab ua kom muaj kev nyab xeeb ntawm cov khoom siv hauv tsev. Tsis tas li ntawd, NM-B cov xov hlau tseem muaj cov khoom siv hluav taws kub uas tuaj yeem muab kev tiv thaiv qee yam thaum muaj xwm txheej kub ntxhov xws li hluav taws kub, ua kom muaj kev nyab xeeb hauv tsev.
Peb feem ntau pom cov qauv ntawm NB xov hlau nrog romex sab hauv, uas yog lub cim lag luam ntawm South Wire hauv Tebchaws Meskas. Cov tsiaj ntawv 10 lossis 12 nyob rau hauv pem hauv ntej ntawm txhua qhov kev qhia tshwj xeeb qhia cov khoom tshwj xeeb, xws li 10awg lossis 12awg, thaum av sawv cev rau cov hlau tsis muaj tooj liab hauv NB hlau raws li cov xaim hauv av.
Cov tub ntxhais hlau ntawm nm b xaim yog nylon sheathed hlau THHN hlau los yog THWN 2 hlau, nrog PVC rwb thaiv tsev thiab ib pob tshab nylon coated rwb thaiv tsev txheej txheej Cov tub ntxhais xov hlau yog teem nyob rau hauv parallel los yog twisted rau hauv ib lub voj voog Feem ntau, ib {{1 }}core grounded nm b xaim yog cov xaim tiaj tus, xws li 12 2 nm cable, 8 2 romex hlau, nm b10 2 nrog av romex. A 3-core grounded nm b cable yog ib puag ncig xaim, xws li 6 3 nm b xaim, 10 3 nm b, 6 3 w av romex
Cov ntaub ntawv sheath yog tshwj xeeb kub-resistant thermoplastic sheath ua los ntawm cov nplaim hluav taws kub-retardant PVC khoom, uas yog hnav-resistant, kub resistant, tsis kub resistant, thiab resistant rau dov. Nws yog tshwj xeeb tshaj yog haum rau siv raws li lub tsev hlau. Ua hauj lwm voltage: 600V, khiav hauj lwm kub: 90 degree C nyob rau hauv ib tug qhuav qhov chaw. Lub nmb hlau ua raws li UL (MTW) tshuab cuab yeej hlau CSA thiab lwm yam US thiab Canadian qauv, ua kom nmb siv ib txhij nyob rau hauv North American lag luam.
