Ronahiya teqînê-delîl di sê dabeşan de têne categorî kirin: IIA, IIB, û IIC.
Class IIA
Suitable for places with gasoline-like substances, wek stasyonên gazê. Gaza nûnerê vê kategoriyê propane ye.
Class IIB
Used in general factories where hazardous gases are present. Ethylene is the representative gas for this classification.
Class IIC
Designed for factories exposed to hîdrojen, acetylen, or carbon disulfide.