How to understand the Ex-proof mark of an explosion-proof light
Explosion-proof mark = “Ex” + explosion-proof type + the equipment classification for explosive gas + ignition temperature of explosive gas and the allowable max. surface temperature + EPL(equipment protection level)
Overview
What is explosion-proof rating
The explosion-proof rating is used to indicate the explosion-proof performance of explosion-proof lights. Lights with explosion-proof qualifications are generally suitable for hazardous locations where flammable gases and dust are present. They can prevent the occurrence of arcs, sparks, and high temperatures inside the lamp from igniting flammable gases and dust in the surrounding environment, thus achieving explosion proof.
Explosion-proof type
The equipment classification for explosive gas
Group | Min ignition current radio | MESG(mm)max safe gap |
IIA | 0.8<MIC<1.0 | 0.9<MESG<1.14 |
IIB | 0.45<MIC<0.8 | 0.5<MESG<0.9 |
IIC | MIC≤0.45 | MESG≤0.5 |
Ignition temperature of explosive gas and the allowable max. surface temperature
Group | Ignition temperature℃ | The allowable max.temperature of surface |
T6 | 85<T≤100 | 85 |
T5 | 100<T≤135 | 100 |
T4 | 135<T≤200 | 135 |
T3 | 200<T≤300 | 200 |
T2 | 300<T≤450 | 300 |
T1 | 450<T | 450 |
EPL
Ga/Da: “very high”, for use in Zone 0, Zone 20
Gb/Db: “high or normal”, for use in Zone 1, Zone 21
Gc/Dc: “low”, for use in Zone 2, Zone 21
