CT4

The specific meaning of the Ex d IIC T4 explosion-proof marking is comprehensively explained, detailing its flameproof enclosure, gas group, and temperature class.

The specific meaning of the Ex ib IIC T4 Gb explosion-proof rating is detailed, including its intrinsic safety type, gas class, and temperature group.

The IIC classification exceeds the IIB classification and serves as a reference for designing electrical equipment in explosive environments.

It is evident that CT4 holds a higher explosion-proof rating. Notably, explosion-proof motors feature the IICT4 designation but lack the IICT2 marking.

Operating d II CT4 devices ensures a lower maximum operating temperature, which increases safety. The term "d" denotes flameproof equipment.

Exd IIC T4 and Exd IIC T5 share similar explosion-proof ratings, with the sole distinction being the maximum temperature each can reach during operation.