Group G : Atmospheres containing combustible dusts ( flour, starch, pulverized sugar and cocoa, dairy powders, dried hay, etc). having resistivity of less than 108 ohm-centimeter or greater
EESiFlo North America, Terminology and Glossary: Explosion Proof & Hazardous Areas, Pennsylvania, USA 2002, flowmeterdirectory.com/flowmeter_terminology, (Mrtm/ Explo Proof and Haz Areas - Amer) {561}