Conduit Bodies & Nec Technical Information
Areas in which flammable gases or vapors may be present in the air in sufficient quantities to be explosive
Group A: Atmospheres containing acetyleneAreas made hazardous by the presence of combustible dust.
Group E: Atmospheres containing combustible: 1 - Metal dusts, regardless of resistivity 2 - Dusts with similarly hazardous characteristics having a resistivity of less than 100 κΩ-cm 3 - Electrically conductive dusts
Group F: Atmospheres containing combustible:
1 - carbon black, charcoal or coke dusts having more than 8% total volatile material 2 - dusts so sensitized that they present an explosion hazard, and having a resistivity greater than 100 Ω-cm but less than or equal to 1 x 108Ω-cm
Group G: Atmospheres containing combustible:
1 - dust having resistivity equal to or greater than 100 κΩ -cm
2 - electrically non-conductive dusts