Under Italian Legislative Decree 81/2008, the employer is legally responsible for providing explosion-proof equipment. Citing CEI 31-35 is often required during a technical audit by local health authorities (ASL) or fire brigades (Vigili del Fuoco).
Official CEI standards come with errata sheets (correction pages). Free scanned PDFs never include these. One wrong temperature class (T-Class) listed in an obsolete document could cause a catastrophic explosion. cei 31-35 pdf
Section 4 of most parts of CEI 31-35 references the installation standard CEI 31-34 (which is the EN 60079-14). Your "cei 31-35 pdf" is for equipment construction, but remember: you also need CEI 31-34 for installation. Under Italian Legislative Decree 81/2008, the employer is
If your company produces junction boxes, motors, sensors, or lighting fixtures intended for Zone 1 or Zone 2 explosive areas, your product must comply with CEI 31-35. The standard dictates every screw, gasket, and clearance distance. Free scanned PDFs never include these
The CEI is moving toward "smart standards." By 2026, expect the official CEI 31-35 PDF to include interactive decision trees and integrated ATEX declaration generators. This is another reason to avoid static, pirated PDFs—they will soon become engineering fossils.