23 Year Industrial Explosion-Proof Manufacturer

WhichLevelofExplosion-ProofIsHigher,CT2orCT4|TechnicalSpecifications

Technical Specifications

Which Level of Explosion-Proof Is Higher, CT2 or CT4

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

Temperature level IEC/EN/GB 3836The highest surface temperature of the equipment T [℃]Lgnition temperature of combustible substances [℃]
T1450T>450
T2300450≥T>300
T3200300≥T>200
T4135200≥T>135
T5100135≥T>100
T685100≥T>8

This distinction stems from the temperature classifications of explosion-proof electrical devices: T4 devices are designed to maintain a maximum surface temperature below 135°C, whereas T2 devices allow a maximum surface temperature up to 300°C, deemed excessively risky.

Consequently, CT4 is the preferred choice; CT2 is generally avoided.

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