NF C23-581-1-2:2000 Electrical apparatus for use in the presence of combustible dust - Part 1-2 : electrical apparatus protected by enclosures - Selection, installation and maintenance.
2000NF C23-581-1-2:2000 Electrical apparatus for use in the presence of combustible dust - Part 1-2 : electrical apparatus protected by enclosures - Selection, installation and maintenance.