Advantages Class I Division 2,Group C,D Zone 1, Zone 2 Class II Division 1,Group E,F,G Zone 21, Zone 22 Class III Type 4Xï¼?IP66 Ex d e IIB T6 Gb Max.250A Ex tD A21 T80â?? IP66 Built-in Terminal blocks Constructed with the enclosure combination for flame proof aluminum alloy Ex d housing and increased safety aluminum alloy Ex e housing, SPN-de-IIB series explosion proof panel is defended by dual protection and operated by flame proof threaded switching handle on hubs of the housing cover. A scientific combination for several pieces housing of explosion proof panelboards have both panel function and junction box function meeting parts of complicated need, the hazard class division is class 1 div 2 for group C, D and zone 1 for group IIC.