Code that identifies the protection method, gas group, temperature rating, and equipment protection level of a hazardous location fixture
AEx: U.S. adoption of IECEx standards (per NEC/UL)
db: Type of protection (flameproof enclosure)
IIB+H2: Gas group (ethylene and hydrogen atmospheres)
T4: Temperature class (max surface temperature 135°C)
Gb: Equipment protection level (high, suitable for Zone 1 gas areas)
Synonyms:
Db
IIB+H2
T4
Gb
