CEI 31-35 is an Italian technical guide for classifying hazardous areas where explosive gas atmospheres may occur, functioning as the national application guide for EN 60079-10-1. It outlines procedures for evaluating ventilation, identifying emission sources, and determining safety zones (0, 1, 2). The current 2018 edition provides updated methodologies for analyzing hazardous locations. Purchase the official PDF through the CEI Webstore Intertek Inform Intertek Inform CEI 31-35 : 2012 EXPLOSIVE ATMOSPHERES - Intertek Inform