Hokker eksploazjebestindich nivo is heger, BT4 of BT6

Neffens nasjonale noarmen foar elektryske eksploazjebeskerming, sawol BT4 as BT6 falle ûnder Klasse IIB.

Temperatuer groep fan elektryske apparatuer	Maksimum tastiene oerflaktemperatuer fan elektryske apparatuer (℃)	Gas / damp ûntstekking temperatuer (℃)	Applicable apparaat temperatuer nivo
T1	450	＞450	T1~T6
T2	300	＞300	T2~T6
T3	200	＞200	T3~T6
T4	135	＞135	T4~T6
T5	100	＞100	T5~T6
T6	85	＞85	T6

lykwols, the ‘T’ classification pertains to the temperature rating of explosion-proof electrical devices. Apparaten klassifisearre as T6 moatte hanthavenje in oerflak temperatuer net heger as 85 ° C, T5 moat net boppe 100 ° C, and T4 must not surpass 135°C.

The lower a device’s maximum surface temperatuer, the less likely it is to ignite atmospheric gases, thereby enhancing safety. Dêrtroch, the explosion-proof rating of BT6 exceeds that of BT4.