1. CEN. (2002). Potentially explosive atmospheres—Explosion prevention and protection—Determination of minimum ignition energy of dust/air mixtures. Report prEN 13821, CEN Central Secretariat, Brussels.
2. CEN. (2004). Non-electrical equipment for use in potentially explosive atmospheres. Part 3: Protection by flameproof enclosure ‘d’. European draft standard prEN 13463-3, January 2004, CEN Central Secretariat, Brussels.
3. CENELEC. (1998a). Electrical apparatus for use in the presence of combustible dust. Part 1–1: Construction and testing. European standard EN 50281-1-1, September 1998, CENELEC Central Secretariat, Brussels.
4. CENELEC. (1998b). Electrical apparatus for use in the presence of combustible dust. Part 1–2: Selection, installation and maintenance. European standard EN 50281-1-2, September 1998, CENELEC Central Office, Brussels.
5. CENELEC. (2001). Electrical apparatus for potentially explosive gas atmospheres—Intrinsic safety ‘i’, Final draft European standard EN 50020. April 2001, CENELEC Central Office, Brussels.