Peb qhov tseem ceeb ntawm cov hlau tsis muaj nyob hauv kev siv niaj hnub no: Rigid Hlau Conduit, Nruab Nrab Hlau Conduit thiab Hluav Taws Xob Hlau Hluav Taws Xob.
Rigid Hlau Conduit (RMC), tseem hu ua Rigid Galvanized Steel (RGS) orGalvanized Rigid Conduit (GRC), yog cov xov tuab ntawm cov tubing, nrog cov phab ntsa tubing uas yog tuab txaus kom nws ua xov. Nws cov ntawv thov ntau hauv kev ua lag luam thiab kev tsim kho.
Lub Nruab Nrab Hlau Conduit (IMC) yog lub steel tubing hnyav dua EMT tab sis sib dua li RMC. Nws tuaj yeem xov.
Kev Siv Hluav Taws Xob Hluav Taws Xob (EMT), qee zaum hu ua nyias-phab ntsa, feem ntau siv siv RMC, vim tias nws tsis tshua muaj nqi thiab sib dua li RMC. EMT nws tus kheej tsis yog xov, tab sis tuaj yeem siv nrog cov xov fittings uas clamp rau nws. Qhov ntev ntawm cov txuas nrog txuas rau txhua qhov sib txuas thiab cov khoom siv nrog clamp-fittings. Zoo li RMC, EMT muaj ntau dua rau hauv cov tsev lag luam thiab chaw tsim khoom ntau dua li cov ntawv thov nyob hauv zej zog. EMT feem ntau yog ua los ntawm cov hlau tsis xeb, tab sis nws yuav yog txhuas.
