CEI 31-35 is a technical guide published by the . Its primary focus is the classification of hazardous areas where explosive gases, vapors, or mists can create fire and explosion risks.
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For more detailed information, you can read the guidance provided by Certifico . The new classification of hazardous areas | Cortem S.p.A.
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| Zone | Gas Presence | Allowed Protection Types (CEI 31-35) | | :--- | :--- | :--- | | Zone 0 | Continuous | Ex ia, Ex ma (Intrinsic safety / Encapsulation) | | Zone 1 | Likely in normal operation | Ex d, Ex e, Ex p, Ex q, Ex o | | Zone 2 | Unlikely, short duration | Ex n, Ex ec | cei 31-35 pdf
Note: Because CEI documents are copyrighted intellectual property, legitimate copies of the CEI 31-35 PDF should be acquired directly through the official CEI Webstore or authorized standard vendors to ensure you are utilizing the most up-to-date edition and technical errata. Summary of Benefits Industrial Benefit Eliminates guesswork by using math to size hazardous zones. Cost Optimization
The CEI 31 series specifically deals with electrical installations. This series might cover a wide range of topics including, but not limited to:
It provides an analytical method for classifying hazardous areas where flammable gases, vapors, or mists are present. It serves as a practical implementation guide for the broader European standard EN 60079-10-1
Helps determine the correct "Zone" (0, 1, or 2) to ensure the right electrical equipment is selected. Getting the PDF CEI 31-35 is a technical guide published by the
According to the standards, including those outlined in , areas are classified into three main zones:
The safety of electrical systems in locations with potentially explosive atmospheres is a primary concern in many industrial and commercial settings. When flammable gases, vapors, or mists are present, the risk of an explosion from an electrical spark is a constant threat. To manage this risk, it's essential to classify these locations into zones based on the frequency and duration of an explosive atmosphere.
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For those looking to secure an official copy, the CEI Standards catalogue offers the guide in both hardcopy and PDF formats to keep your technical library up to date. CEI 31-35;Ab This link or copies made by others cannot be deleted
Before a zone can be classified, safety engineers must pinpoint every potential point of release (e.g., valves, flanges, pumps, or vents) and categorize them into three grades:
CEI 31-35 is a technical guide from the Comitato Elettrotecnico Italiano providing methodologies for classifying hazardous areas with explosive gas atmospheres. It facilitates compliance with ATEX regulations by detailing procedures for identifying sources of emission, release grades, and ventilation efficacy. For more details, visit CEI Webstore. CEI 31-35 : 2012 EXPLOSIVE ATMOSPHERES - Intertek Inform
Completely aligned with the modern CEI EN 60079-10-1 framework . It refined the criteria regarding ventilation evaluation, which drastically influences whether a physical zone is designated as dangerous or safe. 2. Key Technical Components in the CEI 31-35 PDF