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'''T6''' - Temperature Class (T1 - T6)<br>
'''T6''' - Temperature Class (T1 - T6)<br>
'''Gb''' - Equipment Protection Level<br>
'''Gb''' - Equipment Protection Level<br>
'''Issued certification marking added on devices:'''
'''II''': There are two equipment groups - Group I, which concerns mines and is very restrictive due to the highly volatile methane gas and dust present, and Group II, which relates to all other above-ground industries.
'''II''': There are two equipment groups - Group I, which concerns mines and is very restrictive due to the highly volatile methane gas and dust present, and Group II, which relates to all other above-ground industries.