ISA 60079-5-1998 "Electrical Apparatus for Use in Class I@ Zone 1 Hazardous (Classified) Locations Type of Protection - Powder Filling ""q"" (12.25.01; Fourth Printing: 07/15/2005)"
2009ISA 60079-5-2009 Explosive Atmospheres - Part 5: Equipment Protection by Powder Filling “q” (Third Edition; 12.00.04)
1998ISA 60079-5-1998 "Electrical Apparatus for Use in Class I@ Zone 1 Hazardous (Classified) Locations Type of Protection - Powder Filling ""q"" (12.25.01; Fourth Printing: 07/15/2005)"