NF C23-581-1-2/A1:2003 Electrical apparatus for use in the presence of combustible dust - Part 1-2: electrical apparatus protected by enclosures - Selection, installation and maintenance.
2003NF C23-581-1-2/A1:2003 Electrical apparatus for use in the presence of combustible dust - Part 1-2: electrical apparatus protected by enclosures - Selection, installation and maintenance.