NF C23-241-17:2005 Electrical apparatus for use in the presence of combustible dust - Part 17 : inspection and maintenance of electrical installations in hazardous areas (other than mines).
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.
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.