GOST 30852.11-2002 PDF

Full title and description

GOST 30852.11-2002. Электрооборудование взрывозащищенное. Часть 12. Классификация смесей газов и паров с воздухом по безопасным экспериментальным максимальным зазорам и минимальным воспламеняющим токам — Standard for explosion‑protected electrical apparatus: Part 12 — classification of gas and vapour/air mixtures by Maximum Experimental Safe Gaps (MESG) and Minimum Igniting Currents (MIC).

Abstract

This standard specifies classification criteria and test guidance for mixtures of gases and vapours with air, using Maximum Experimental Safe Gaps (MESG) and Minimum Igniting Currents (MIC). It provides tabulated classifications for commonly encountered gases and vapours, describes test methods for determining MESG and MIC for gases not listed, and gives rules for selecting appropriate explosion‑protection types (for example flameproof enclosure "d" or intrinsic safety "i") and equipment groups/subgroups based on the gas classification.

General information

• Status: Replaced / withdrawn for national use (replaced by GOST 31610.20-1-2020; validity for this edition ended 01 October 2021).
• Publication date: Registered 6 November 2002 (designation year 2002); introduced for national application in the Russian Federation 15 February 2014; latest reissue dated 24 March 2014.
• Publisher: Interstate Council for Standardization, Metrology and Certification (EASC); administrated in Russia by the Federal Agency for Technical Regulating and Metrology (Rosstandart). Document prepared by ANNO "Ex‑standard".
• ICS / categories: 29.260.20 — Electrical apparatus for explosive atmospheres (part of the electrical equipment for special conditions sector).
• Edition / version: GOST 30852.11-2002 (first published as an interstate standard with later national reissue in 2014).
• Number of pages: 16 pages (original document).

Scope

The standard establishes classification rules for commonly used explosive gas and vapour/air mixtures by their MESG and MIC values, sets out the recommended test procedures to determine these parameters for unlisted gases, and provides guidance for selecting the appropriate equipment group or subgroup and explosion‑protection method (for example flameproof enclosure or intrinsic safety) for electrical apparatus intended for use in atmospheres containing the classified gases.

Key topics and requirements

• Definition and explanation of MESG (Maximum Experimental Safe Gap) and MIC (Minimum Igniting Current).
• Classification table(s) assigning gases and vapours to gas groups/subgroups based on MESG and MIC values.
• Test methods and procedural guidance for measuring MESG and MIC for gases not covered in the tables.
• Criteria for assigning gas groups relevant to explosion‑protection types (grouping consistent with IEC 60079 series practice).
• Guidance on selecting explosion‑protected equipment types (e.g., flameproof "d", intrinsic safety "i") and associated equipment subgroups depending on gas classification.
• Normative references and cross‑references to other parts of the GOST 30852 series and to IEC 60079 (originally aligned with IEC 60079‑12:1978).

Typical use and users

Used by designers, manufacturers, conformity assessment bodies, testers and safety engineers working with electrical equipment intended for hazardous (explosive) atmospheres — particularly in petrochemical, oil & gas, mining, chemical processing and related industries. Also referenced by certification laboratories and organizations responsible for selecting appropriate explosion‑protected equipment and for establishing safe installation and maintenance practices in gas/vapour atmospheres.

Related standards

Part of the GOST 30852 (explosion‑protected electrical apparatus) family. Related documents include GOST 30852.0-2002, GOST 30852.1-2002, GOST 30852.2-2002, GOST 30852.4-2002, GOST 30852.10-2002, and the IEC/ISO counterparts (originally derived from IEC 60079‑12:1978). Superseding standard: GOST 31610.20-1-2020 (the more recent normative framework harmonized with later IEC 60079 editions).

Keywords

explosion‑protected, gas classification, MESG, MIC, maximum experimental safe gap, minimum igniting current, gas group, intrinsic safety, flameproof enclosure, hazardous area, GOST 30852.

FAQ

Q: What is this standard?

A: GOST 30852.11-2002 is an interstate (GOST) standard that defines classification criteria for gas and vapour/air mixtures by Maximum Experimental Safe Gaps (MESG) and Minimum Igniting Currents (MIC) to support selection of explosion‑protected electrical equipment.

Q: What does it cover?

A: It covers definitions, MESG and MIC test guidance, classification tables for common gases and vapours, rules for assigning gas groups/subgroups, and guidance for selecting appropriate explosion‑protection methods (for example flameproof enclosures or intrinsic safety).

Q: Who typically uses it?

A: Equipment designers, manufacturers, testing and certification laboratories, safety engineers, and regulatory or procurement bodies in industries that operate in potentially explosive gas/vapour atmospheres (oil & gas, petrochemical, chemical processing, mining, etc.).

Q: Is it current or superseded?

A: This edition (GOST 30852.11-2002) has been superseded in practice. It was registered 6 November 2002 and later introduced nationally (Russia) on 15 February 2014, but its validity was later ended and it is replaced by GOST 31610.20-1-2020 (which aligns with newer IEC 60079 series requirements). Check the relevant national/regulatory registry for the authoritative current status in your jurisdiction.

Q: Is it part of a series?

A: Yes — it is Part 12 of the GOST 30852 series addressing explosion‑protected electrical apparatus; the series contains multiple parts covering general requirements and specific protection types (for example intrinsic safety, flameproof enclosures, wiring practices and other protection concepts).

Q: What are the key keywords?

A: MESG, MIC, explosion‑protected electrical apparatus, gas classification, gas group, intrinsic safety (i), flameproof enclosure (d), hazardous areas, GOST 30852.