According to the standards, including those outlined in , areas are classified into three main zones:
For electrical engineers, plant safety managers, and compliance officers, locating and utilizing the official is an essential step to ensure legal compliance, prevent catastrophic industrial accidents, and properly select ATEX-certified electrical equipment. 1. What is CEI 31-35?
The CEI 31-35 PDF is a copyrighted publication and is not available for free. Since the main guide has been withdrawn, you can no longer purchase the base version (CEI 31-35:2018) from official sales channels like the CEI store itself. However, you can still find official PDFs from authorized distributors. The best sources for obtaining the official PDF are:
During consulting audits, we regularly see three mistakes that originate from using old, illegal PDFs: cei 31-35 pdf
The transition from discrete relay-based interlocking to electronic and software-driven control systems is one of the greatest engineering challenges facing modern railway infrastructure managers. While new builds can be designed from scratch to comply with rigorous safety standards, the vast majority of operational lines rely on legacy equipment retrofitted with modern sensors and logic units. The series (IEC 61131-3 derived, adapted for rail) provides a powerful, yet often underutilized, framework for certifying these hybrid systems. This essay argues that the structured programming models and safety lifecycle defined in CEI 31-35 are not merely bureaucratic hurdles but practical tools for managing complexity, reducing verification time, and achieving SIL (Safety Integrity Level) 2 and 3 compliance in brownfield railway applications.
A release that is constant or occurs for long intervals (e.g., the interior of an unroofed storage tank).
An area where an explosive atmosphere is present continuously, for long periods, or frequently. According to the standards, including those outlined in
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For full technical compliance (ATEX, IECEx, or CE marking), purchase from the official CEI national store or refer to IEC 60079-0 .
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A primary reason the CEI 31-35 PDF is heavily downloaded by technical entities is the presence of its dedicated industry scenarios. These sections offer specific templates to help bypass complex calculations if certain operational parameters are fulfilled.
While CEI EN 60079-10-1 offers the theoretical basis for zone classification, , offering detailed methodologies to identify the release sources, the ventilation types, and the resulting zone boundaries. 3. Practical Examples (CEI 31-35/A)
, the full text cannot be provided here. You can access the official PDF or a hard copy through the following authorized channels: Official Sources for CEI 31-35 CEI Official Catalogue
Available in hardcopy and PDF formats, primarily in Italian. Intertek Inform Where to Access the PDF
By adhering to the CEI 31-35 standard, industrial automation stakeholders in Italy can benefit in several ways: