GE P4A Technical Manual page 51

P54A/B/C/E
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 parentheses marking around the zone number) is not itself suitable for operation
within a potentially explosive atmosphere.
P54xMED-TM-EN-1
Chapter 2 - Safety Information
25