Where:
'II' Equipment Group: Industrial.
'(2)G' High protection equipment category, for control of equipment in gas atmospheres in Zone 1 and 2.
This equipment (with par
entheses marking around the zone number) is not itself suitable for operation
within a potentially explosive atmosphere.
P54A/B/C/E Chapter 22 - Technical Specifications
P54xMED-TM-EN-1 531