arpadveress 
Background
With changes to the Type of Protection designations in the IEC 60079 Series, a number of these Type of Protection designations are not identified in the current edition of IEC 60079-14. This may create confusion for end users regarding the correct application of equipment with these Types of Protection.
Question
How should equipment be marked with new Type of Protection designations be handled in accordance with IEC 60079-14?
Interpretation
Equipment marked with new Type of Protection designations shall be applied in accordance with IEC 60079-14 requirements based on the following points and IEC 60079-14:2013,
• Ex “eb” should be treated as equivalent to Ex “e”
• Ex “ec” should be treated as equivalent to Ex “nA”
• Ex “db” should be treated as equivalent to Ex “d”
• Ex “dc” requirements should be based on Ex “d” requirements but is only suitable for EPL Gc
• Ex “ob” should be treated as equivalent to Ex “o”
• Ex “oc” requirements should be based on Ex “o” requirements but is only suitable for EPL Gc
Source: iec interpretation sheet
Keep up good work!
Arpad
