The flameproof designation “d” aligns with the EPL Gb category, which is appropriate only for gas environments in Zones 1 and 2;
| Explosion proof typea | Gas Explosion-Proof Marking |
|---|---|
| Intrinsic safety type | ia,ib,ic |
| Flame type | d,db |
The intrinsic safety designation “ia” is associated with the highest level, EPL Ga, covering gas environments in Zones 0, 1, and 2;
Hence, the intrinsic safety type ia offers a superior level of explosion protection compared to the flameproof type.
