1. European Standard, EN 50014: Electrical apparatus for potentially explosive atmospheres, General requirements.
2. European Standard, EN 50018: Electrical apparatus for potentially explosive atmospheres, Flameproof enclosure “d”.
3. European Standard, EN 50019: Electrical apparatus for potentially explosive atmospheres, Increased safety “e”.
4. European Standard, EN 50020: Electrical apparatus for potentially explosive atmospheres, Intrinsic safety “i”.
5. European Standard, EN 50054: Electrical apparatus for the detection and measurements of combustible gases, General requirements and test methods.