Кое ниво на взривозащитеност е по-високо - IA или D

The flameproof designation “d” aligns with the EPL Gb category, which is appropriate only for gas environments in Zones 1 and 2;

Взривозащитена версия	Символ за защита от експлозия на газ
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.