SIST EN 50303:2000
(Main)Group I, Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust
Group I, Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust
1.1 This standard specifies the design, construction, testing and marking requirements for Group I, Category M1 equipment intended to remain functional in underground parts of mines, as well as those parts of surface installations of such mines endangered by firedamp and/or coal dust clouds under normal atmospheric conditions of pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from 20 °C to + 60 °C.
1.2 It applies to all electrical and non-electrical equipment capable of causing an explosion through its own potential source of ignition.
1.3 It also applies to cables, pipes and optical fibres, when such items are used to carry energy sources and form part of equipment intended to remain functional in an atmosphere endangered by firedamp and/or coal dust.
1.4 It does not apply to category M1 Miners' Caplights, which are dealt with in prEN 62013-1 (in preparation).
NOTE 1 As the energy needed to ignite a coal dust /air cloud is in excess of 600 times* that needed to ignite a firedamp /air mixture, this standard assumes that provided intrinsically safe 'ia' circuits are constructed to be safe in an explosive atmosphere of firedamp /air, then such circuits are not capable of directly igniting an explosive atmosphere of coal dust/air.
* Based on tests performed by several member state laboratories. Verified at the UK Health & Safety Laboratories, Buxton - Report by Dr P. Tolson, dated 9 August 1995 - "Ignition of coal dust/air mixtures using a modified IEC spark test apparatus".
NOTE 2 In designing equipment for operation in explosive atmospheric conditions other than those given in 1.1 above, this standard may be used as a guide. In such cases, additional testing is recommended to allow the manufacturer to be able to demonstrate that the equipment is suitable for the exceptional conditions of use.
NOTE 3 When an explosive firedamp atmosphere occurs in the underground workings of a mine, or at a surface installation, it is imperative that the ignition risk be kept to a minimum. Member State Governments may therefore prohibit the continued use of certain Category M1 equipment in an atmosphere endangered by firedamp and/or coal dust if it is not necessary for it to remain functional for the protection of workers**.
** This has its origin in clause 5.1 of the proposals to the Governments of members States adopted by the Safety and Health Commission for Mining and Other Extractive Industries (SHCMOEI) at its meeting on 29.10.1986. Document No 6374/13/82 - "Electrical apparatus and systems for use when the concentration of firedamp exceeds the statutory limit for electricity".
Gruppe I, Kategorie M1 Geräte für den Einsatz in Atmosphären, die durch Grubengas und/oder brennbare Stäube gefährdet sind
Appareils du groupe I de catégorie M1 destinés à rester en opération dans les atmosphères exposées au grisou et/ou à la poussière de charbon
Oprema skupine I, kategorije M1, ki ostane v delovanju v atmosferah, ki jih ogroža jamski eksplozivni plin ali premogov prah
General Information
- Status
- Published
- Publication Date
- 30-Nov-2000
- Technical Committee
- EXP - Product for explosive atmospheres
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2000
- Due Date
- 01-Dec-2000
- Completion Date
- 01-Dec-2000
Overview
EN 50303:2000 (CLC) specifies requirements for Group I, Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust. The standard covers the design, construction, testing and marking of equipment used in underground mine workings and parts of surface installations where firedamp (methane) or coal-dust clouds may occur under normal atmospheric conditions (pressures from 0.8 bar to 1.1 bar and temperatures 20 °C to +60 °C). EN 50303:2000 applies to both electrical and non-electrical apparatus that could act as potential ignition sources, and to cables, pipes and optical fibres that carry energy as part of such equipment.
Keywords: EN 50303:2000, Group I Category M1, firedamp, coal dust, explosive atmospheres, mining equipment, intrinsic safety.
Key topics and requirements
- Scope and application: Equipment required to remain functional in hazardous mine atmospheres (Group I, Category M1).
- Design and construction: Engineering considerations to minimise ignition risk in firedamp/coal-dust environments.
- Testing: Verification methods to demonstrate suitability under specified pressure and temperature conditions.
- Marking: Identification and marking requirements to show compliance and intended use in M1 hazardous zones.
- Included items: All electrical and non-electrical apparatus capable of causing an explosion, plus cables, pipes and optical fibres when they form part of such equipment.
- Exclusions and cross-reference: Miners’ caplights (Category M1) are excluded and are addressed in prEN 62013-1 (in preparation).
- Intrinsic safety note: The standard recognises that intrinsically safe ‘ia’ circuits designed for firedamp/air are, by test evidence, unlikely to directly ignite coal-dust/air clouds because coal-dust ignition energy is much higher.
- Regulatory caution: Member State authorities may prohibit continued use of certain M1 equipment in explosive atmospheres unless it is essential for worker protection.
Applications and users
EN 50303:2000 is primarily used by:
- Mining equipment manufacturers designing machinery and apparatus for Group I, Category M1 applications.
- Safety and design engineers specifying equipment for underground mines and at-risk surface installations.
- Certification and test laboratories evaluating equipment for explosive atmosphere safety.
- Mine operators and maintenance teams selecting compliant components (equipment, cables, optical fibres, pipes).
- Compliance officers documenting marking and testing evidence for regulatory inspections.
Practical value: ensures reliable operation of safety-critical equipment in firedamp/coal-dust environments while minimising ignition risk and supporting consistent conformity assessment.
Related standards
- prEN 62013-1 (miners’ caplights) - referenced exclusion for caplights.
- Research/verification: ignition-energy studies (e.g., UK Health & Safety Laboratories report cited in the standard) used to justify intrinsic-safety assumptions.
For procurement or compliance searches use phrases like “EN 50303:2000 mining equipment”, “Group I Category M1 standard”, “firedamp coal dust safety” to find relevant documents and guidance.
Frequently Asked Questions
SIST EN 50303:2000 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Group I, Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust". This standard covers: 1.1 This standard specifies the design, construction, testing and marking requirements for Group I, Category M1 equipment intended to remain functional in underground parts of mines, as well as those parts of surface installations of such mines endangered by firedamp and/or coal dust clouds under normal atmospheric conditions of pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from 20 °C to + 60 °C. 1.2 It applies to all electrical and non-electrical equipment capable of causing an explosion through its own potential source of ignition. 1.3 It also applies to cables, pipes and optical fibres, when such items are used to carry energy sources and form part of equipment intended to remain functional in an atmosphere endangered by firedamp and/or coal dust. 1.4 It does not apply to category M1 Miners' Caplights, which are dealt with in prEN 62013-1 (in preparation). NOTE 1 As the energy needed to ignite a coal dust /air cloud is in excess of 600 times* that needed to ignite a firedamp /air mixture, this standard assumes that provided intrinsically safe 'ia' circuits are constructed to be safe in an explosive atmosphere of firedamp /air, then such circuits are not capable of directly igniting an explosive atmosphere of coal dust/air. * Based on tests performed by several member state laboratories. Verified at the UK Health & Safety Laboratories, Buxton - Report by Dr P. Tolson, dated 9 August 1995 - "Ignition of coal dust/air mixtures using a modified IEC spark test apparatus". NOTE 2 In designing equipment for operation in explosive atmospheric conditions other than those given in 1.1 above, this standard may be used as a guide. In such cases, additional testing is recommended to allow the manufacturer to be able to demonstrate that the equipment is suitable for the exceptional conditions of use. NOTE 3 When an explosive firedamp atmosphere occurs in the underground workings of a mine, or at a surface installation, it is imperative that the ignition risk be kept to a minimum. Member State Governments may therefore prohibit the continued use of certain Category M1 equipment in an atmosphere endangered by firedamp and/or coal dust if it is not necessary for it to remain functional for the protection of workers**. ** This has its origin in clause 5.1 of the proposals to the Governments of members States adopted by the Safety and Health Commission for Mining and Other Extractive Industries (SHCMOEI) at its meeting on 29.10.1986. Document No 6374/13/82 - "Electrical apparatus and systems for use when the concentration of firedamp exceeds the statutory limit for electricity".
1.1 This standard specifies the design, construction, testing and marking requirements for Group I, Category M1 equipment intended to remain functional in underground parts of mines, as well as those parts of surface installations of such mines endangered by firedamp and/or coal dust clouds under normal atmospheric conditions of pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from 20 °C to + 60 °C. 1.2 It applies to all electrical and non-electrical equipment capable of causing an explosion through its own potential source of ignition. 1.3 It also applies to cables, pipes and optical fibres, when such items are used to carry energy sources and form part of equipment intended to remain functional in an atmosphere endangered by firedamp and/or coal dust. 1.4 It does not apply to category M1 Miners' Caplights, which are dealt with in prEN 62013-1 (in preparation). NOTE 1 As the energy needed to ignite a coal dust /air cloud is in excess of 600 times* that needed to ignite a firedamp /air mixture, this standard assumes that provided intrinsically safe 'ia' circuits are constructed to be safe in an explosive atmosphere of firedamp /air, then such circuits are not capable of directly igniting an explosive atmosphere of coal dust/air. * Based on tests performed by several member state laboratories. Verified at the UK Health & Safety Laboratories, Buxton - Report by Dr P. Tolson, dated 9 August 1995 - "Ignition of coal dust/air mixtures using a modified IEC spark test apparatus". NOTE 2 In designing equipment for operation in explosive atmospheric conditions other than those given in 1.1 above, this standard may be used as a guide. In such cases, additional testing is recommended to allow the manufacturer to be able to demonstrate that the equipment is suitable for the exceptional conditions of use. NOTE 3 When an explosive firedamp atmosphere occurs in the underground workings of a mine, or at a surface installation, it is imperative that the ignition risk be kept to a minimum. Member State Governments may therefore prohibit the continued use of certain Category M1 equipment in an atmosphere endangered by firedamp and/or coal dust if it is not necessary for it to remain functional for the protection of workers**. ** This has its origin in clause 5.1 of the proposals to the Governments of members States adopted by the Safety and Health Commission for Mining and Other Extractive Industries (SHCMOEI) at its meeting on 29.10.1986. Document No 6374/13/82 - "Electrical apparatus and systems for use when the concentration of firedamp exceeds the statutory limit for electricity".
SIST EN 50303:2000 is classified under the following ICS (International Classification for Standards) categories: 29.260.20 - Electrical apparatus for explosive atmospheres. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 50303:2000 is associated with the following European legislation: EU Directives/Regulations: 2014/34/EU, 94/9/EC; Standardization Mandates: BC/CEN/CLC/92-08. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN 50303:2000 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2000
Oprema skupine I, kategorije M1, ki ostane v delovanju v atmosferah, ki jih ogroža
jamski eksplozivni plin ali premogov prah
Group I, Category M1 equipment intended to remain functional in atmospheres
endangered by firedamp and/or coal dust
Gruppe I, Kategorie M1 Geräte für den Einsatz in Atmosphären, die durch Grubengas
und/oder brennbare Stäube gefährdet sind
Appareils du groupe I de catégorie M1 destinés à rester en opération dans les
atmosphères exposées au grisou et/ou à la poussière de charbon
Ta slovenski standard je istoveten z: EN 50303:2000
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
...
이 기사는 지하 광산 및 유해가스와/또는 석탄 먼지 구름으로 위험에 노출되는 광산의 표면설비의 일부지역에서 기능을 유지할 목적으로 설계된 그룹 I, Category M1 장비에 대한 설계, 건설, 테스트 및 표시 요구사항을 명시합니다. 이 표준은 폭발 위험을 야기할 수 있는 자체 발화원을 가진 전기 및 비전기 장비에 적용됩니다. 또한 에너지원을 운반하고 석탄 먼지/유해가스에 위험에 노출된 환경에서 기능을 유지하는 장비의 일부인 케이블, 파이프 및 광섬유에도 적용됩니다. 그러나 준비 중인 prEN 62013-1에서 다루어지는 M1 광부용 모자 등급에는 적용되지 않습니다. 이 표준은 석탄 먼지/공기 구름을 불발시키기 위해 필요한 에너지가 유해가스/공기 혼합물을 불발시키기 위해 필요한 에너지의 600배 이상이라는 것을 가정으로 세워, 내용으로 이루어지는 'ia' 회로는 유해가스/공기 폭발성 환경에서 안전하게 구축되었다면, 해당 회로는 석탄 먼지/공기 폭발성 환경을 직접 화장시키지 못한다고 가정합니다. 이 기사는 명시된 것 이외의 폭발성 대기조건에서 장비를 설계할 때 이 표준을 참고할 수 있으며, 그런 경우에는 제조업체가 사용 환경의 특수한 조건에 적합성을 증명할 수 있도록 추가적인 테스트가 권장됩니다. 이 기사는 폭발성 유가스 대기조건에서 기능을 유지할 필요가 없는 경우 국가 구성원 정부가 특정 M1 등급 장비의 계속 사용을 금지할 수 있으며, 이는 광업 및 기타 추출 산업에 대한 안전 및 보건 위원회 (SHCMOEI)에서 1986년 10월 29일 회의에서 구성원 국가 정부에게 제안된 조항 5.1에서 기원한 것입니다.
この記事は、地下の鉱山の一部や、それによって火気発生性ガスと/または石炭の塵雲にさらされる危険がある鉱山の地上設備の一部において機能することを意図したグループI、カテゴリM1の機器の設計、構造、試験、マーキングの要件を規定しています。この基準は、自身の発火源によって爆発を引き起こす可能性のある電気および非電気機器に適用されます。エネルギー源を運搬し、火気発生性ガスと/または石炭の塵雲にさらされる環境で機能する機器の一部であるケーブル、パイプ、光ファイバーにも適用されます。ただし、この基準は、別の文書で取り扱われるM1鉱山作業員用ヘッドライトには適用されません。記事は、火気発生性ガス/空気混合気体を発火させるために必要なエネルギーは、火気発生性ガス/空気混合気体を発火させるために必要なエネルギーの600倍以上であると前提とし、この基準では、安全に設計されたイントリンシックセーフ‘ia’回路は火気発生性ガス/空気の爆発性環境では直接的に石炭の塵雲/空気の爆発性環境を引火させることができないものと仮定しています。記事は、1.1で述べられている以外の爆発性大気条件での機器の設計には、この基準を参考にすることができるとし、その場合は、製造業者が特殊な使用条件に適した機器であることを証明するために追加の試験が推奨されると述べています。また、爆発性の火気発生ガス環境が鉱山の地下作業場や地上施設で発生する場合、労働者の保護のためにM1カテゴリの特定の機器の持続的な使用を禁止する場合があると説明しています。
The article discusses the specifications and requirements for Group I, Category M1 equipment designed to function in underground mines and surface installations that are at risk of firedamp and/or coal dust clouds. This standard applies to both electrical and non-electrical equipment that can potentially cause an explosion. It also includes cables, pipes, and optical fibers that carry energy sources. However, it does not cover category M1 Miners' Caplights, which are addressed in a separate document. The article notes that intrinsically safe circuits are assumed to be safe in a firedamp/air atmosphere but not capable of directly igniting a coal dust/air atmosphere due to the significantly higher energy required for ignition. It also suggests that this standard can serve as a guide for designing equipment for other explosive atmospheric conditions, with additional testing recommended for exceptional conditions. The article emphasizes the importance of minimizing ignition risks in areas with explosive atmospheres and states that member state governments may prohibit the use of certain Category M1 equipment if it is not necessary for the protection of workers.
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...