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The CEI 31-35:2018 standard provides a rigorous, prescriptive methodology for classifying hazardous areas with explosive gas atmospheres, acting as a supporting guide for CEI EN 60079-10-1. It establishes specific analytical formulas and ventilation assessments to calculate "dangerous distances," offering a more detailed, conservative approach than general international standards. Access the official standard through Intertek Inform or Standards.ie.

The designation "CEI 31-35" likely refers to a specific standard within the CEI catalog. Standards are usually identified by a number that corresponds to a particular area of interest or sector. For CEI 31, it generally pertains to electrical installations.

Here's a general overview of what such a standard might entail:

3. Relationship with other CEI 31-xx standards

The CEI 31 series mirrors the IEC 60079 series:

| CEI standard | Equivalent IEC | Subject | |--------------|----------------|---------| | CEI 31-30 | IEC 60079-10-1 | Classification of areas | | CEI 31-34 | IEC 60079-14 | Design, selection, erection | | CEI 31-35 | IEC 60079-0 | General requirements | | CEI 31-37 | IEC 60079-1 | Flameproof enclosures “d” | | CEI 31-38 | IEC 60079-2 | Pressurized apparatus “p” |

1. Copyright and Legal Protection

The CEI (Italian Electrotechnical Committee) operates similarly to IEEE or ISO. Standards are copyrighted intellectual property. Distributing a pirated PDF of CEI 31-35 without a license is a violation of Italian copyright law (Legge 633/1941). Companies caught using unlicensed standards can face fines and legal action during discovery phases of litigation following an industrial accident.

5. How to obtain the official CEI 31-35 PDF

You must purchase the CEI standard from authorized sources:

  1. Official CEI Store (CEI-Comitato Elettrotecnico Italiano)

    • Website: https://store.ceinorme.it
    • Search: “CEI 31-35”
    • Price: ~€100–200 depending on edition and format (PDF/Digital)

  2. National standards bodies

    • UNINFO (Italy)
    • Through IEC national committees (if you are outside Italy)

  3. Subscription services

    • IHS Markit, Techstreet, Accuris (for IEC 60079-0 English version, which is equivalent)

  4. University / company internal libraries

    • Some engineering institutions have a CEI reading license.

2. UNI Infopoint (Milano)

Via Sannio, 2 – Milano. You can consult the standard for free in their reading room, though you cannot print or take the digital file.

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