This Chinese standard is the primary document for designing and inspecting low-voltage electrical installations within the country. It applies to electrical devices up to 1000V AC and 1500V DC and ensures the safety of people, livestock, and property.
Relying on guesswork for area classification can lead to either dangerous underestimation or costly over-engineering. By utilizing the methodologies in , safety officers can ensure their hazardous zone definitions (Zone 0, 1, or 2) are backed by rigorous scientific data.
The most recent edition in force is , published in February 2012, which aligns with the European standard CEI EN 60079-10-1:2010 (CEI 31-87). It is crucial to note that the previous edition, CEI 31-35:2001 , was officially withdrawn or replaced by this 2012 edition. Therefore, the 2012 version is the one currently in effect.
These examples demonstrate the practical utility of CEI 31-35 for designers and safety engineers. cei 31-35 pdf
| 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 |
The official paper for is the technical guide titled "Explosive atmospheres - Guide for classification of hazardous areas for the presence of gas in application of CEI EN 60079-10-1 (CEI 31-87)" Intertek Inform The latest version is CEI 31-35:2018
In the world of electrical engineering, safety is not just a practice—it is a codified science. When dealing with explosive atmospheres (often referred to as "ATEX" environments), the margin for error is zero. For Italian engineers, technicians, and safety managers, one document stands as the cornerstone of compliance: . This Chinese standard is the primary document for
Use the standard’s graphs to find the "distance" (dz) to which the hazard extends.
The CEI 31-35 PDF is a and must be purchased from authorized distributors. It is not legally available for free download from unofficial sources. Here is how to obtain a genuine copy:
While international standards like set the framework, CEI 31-35 offers specific, practical methodologies tailored for complex environments. Key features include: By utilizing the methodologies in , safety officers
The structure of the standard has evolved significantly across multiple historical editions to improve the mathematical models used for calculating gas dispersion:
Without the exact document, it's challenging to provide a detailed explanation of CEI 31-35. However, assuming it's part of the CEI 31 series, it likely deals with a specific aspect of electrical installations. This could range from guidelines on protection against overcurrent and earth faults to detailed specifications for materials and equipment used in electrical installations.
Know the Lower Explosive Limit (LEL), flash point, and relative density of the gases involved.
The CEI 31-35 standard, also known as "Guide for the application of IEC 61508 and IEC 61511 in the petroleum, petrochemical and natural gas industries", provides guidance on the application of functional safety standards IEC 61508 and IEC 61511 in the process industries. This report summarizes the key points of the CEI 31-35 PDF.