What Is the Temperature for Explosion-Proof Level T4

The T4 classification specifies that electrical devices must operate with a maximum surface temperature of no more than 135°C. Products with a T6 rating are applicable across various temperature groups, whereas T4 devices are compatible with T4, T3, T2, and T1 conditions.

Kelompok suhu peralatan listrik	Suhu permukaan maksimum peralatan listrik yang diizinkan (℃)	Suhu penyalaan gas/uap (℃)	Tingkat suhu perangkat yang berlaku
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

The reason T6 is not typically used is that many devices, particularly those requiring high power or consisting of purely resistive circuits, are unable to achieve the stringent low-temperature conditions stipulated by the T6 classification.