Tus explosion-Proof kos npe exd IIB T4 Gb txhais hais tias

Ex: Signifies khoom tsim rau explosion-proof daim ntawv thov;

d: Specifies tias cov khoom yog ntawm tus flameproof explosion-proof hom;

II: Classifies tus ntaus ntawv li belonging rau hoob kawm II rau tawg-profo hluav taws xob khoom;

B: Classifies cov roj theem li IIB;

T4: Qhia ib tug txias T4, kos npe tias qhov kub tshaj plaws ntawm cov khoom uas tsis pub tshaj 135°C;

gb: Nruab nrab yog cov kev tiv thaiv ntawm cov khoom siv.