Raws li kev ua haujlwm, cov ntsaws ntsaws tuaj yeem muab faib ua: lub mloog pob ntseg, DC plugs, suab ntsaws, USB plugs, video plugs, microphone plugs, charger plugs, mobile xov tooj plugs, thiab lwm yam. Thoob ntiaj teb, cov khoom siv hauv tsev tau muab faib ua peb pawg loj:
Chav Kawm I: Cov cuab yeej siv tsuas yog ib txheej ntawm rwb thaiv tsev xwb. Cov cuab yeej siv no xav tau kev teeb tsa ntawm cov khoom siv tam sim no (RCD) thiab kev tiv thaiv hauv av (txhais tau tias lawv yuav tsum siv peb -pin plug). Piv txwv xws li cua txias, tshuab cuab yeej, thiab hluav taws xob motors.
Chav Kawm II: Cov khoom siv uas muaj ob - txheej rwb thaiv tsev. Thaum lawv xav tau kev teeb tsa ntawm cov khoom siv tam sim no (RCD), lawv tsis tas yuav muaj kev tiv thaiv hauv av (txhais tau tias lawv tuaj yeem siv ob -pin plug). Piv txwv xws li TV, hluav taws xob kiv cua, rooj teeb, induction cookers, thiab ceramic cookers.
Chav Kawm III: Cov khoom siv uas ua haujlwm rau kev nyab xeeb ntxiv -tsis tshua muaj hluav taws xob (SELV)- feem ntau nyob hauv thaj tsam 12–36V. Piv txwv li cov xov tooj ntawm tes thiab laptop computers.
