Quod Level explosionis probatio superior, IA vel D*

Flameproof designatio “d*” genus adsimilat cum EPL Gb, quod convenit tantum gas ambitus in Zona 1 et 2;

Genus CREPITUS probationem	Gas explosionis symbolum
Intrinsic safety type	ia,ib*,ic
Flame type	d*,db*

Intrinseca salus designatio “ia” coniungitur summis, EPL Ga, covering Gas ambitus in zonis 0, 1, et 2;

Unde, the intrinsic safety type ia offers a superior level of explosion protection compared to the flameproof type.