Explosion protection to-CENELEC-lEC-NEC Can be used inZone 1 and Zone 2Zone 21 and Zone 22Class I, Zone 1 and Zone 2Class I, Division 1, Groups C, D Power: 21W x1, 21W x 2. Enclosure in copper-free aluminium, powder coated surface: yellow (RAL1021) Powder coated wire guard: white. Toughened glass cover resistant to temperature changes.