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EN 50495:2010

Current
Current

The latest, up-to-date edition.

Safety devices required for the safe functioning of equipment with respect to explosion risks
Published date

26-02-2010

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Ignition prevention by safety devices
5 Functional requirements for a safety device
6 Tests
7 Marking
8 Safety instructions
Annex A (informative) - Example of an assessment procedure
        for a simple safety device
Annex B (informative) - Example of an assessment procedure
        for the hardware safety integrity of a safety device
Annex C (informative) - Example of determining the hardware
        safety integrity level
Annex D (informative) - Examples for safety devices
Annex E (informative) - Basic concept for safety devices
Annex ZZ (informative) - Coverage of Essential Requirements
         of EC Directives
Bibliography

This European Standard specifies the requirements of electrical safety devices, which are used to avoid potential ignition sources of equipment in explosive atmospheres.This also includes safety devices, which are operated outside areas with explosive atmospheres, to guarantee the safe function of equipment with respect to explosion hazards.NOTE 1This European Standard can also be used to design and assess safety devices for protective systems.Electrical equipment, which is intended for use in explosive atmospheres, may rely on the correct operation of safety devices which for example maintain certain characteristics of the equipment within acceptable limits. Examples of such safety devices are motor protection devices (to limit temperature rise during stall conditions) and controlling devices for pressurisation protection.By means of control or monitoring devices, sources of ignition can be avoided. Therefore these devices shall execute the appropriate measures in the appropriate reaction time, for example the initiation of an alarm or an automatic shut down.NOTE 2Some potential ignition sources might not be controllable by safety devices, e.g. electrostatic discharges, ignition sparks caused by mechanical impact. Also some protection measures might not be controllable by safety devices, e.g. flameproof enclosures.Safety devices, whose safety function can not adequately be specified under the existing EN 60079 or EN 61241 series of standards, shall additionally be designed according to the requirements of this standard. Generally for complex safety devices appropriate design requirements are not provided in the existing types of protection (see 3.13 for the definition of a complex device). NOTE 3In general the levels of safety required by this standard are considered to be equivalent to those provided by conformity to EN 60079-0 or EN 61241-0. No increase or decrease of safety is intended or required. Similarly neither increase nor decrease of safety with respect to EN 61508 series is intended.Safety devices can be classified in 2 types:a)devices, which are included as component in the equipment under control (see 3.8). The combined apparatus is considered as equipment.EXAMPLES- thermal switch or thermistor to avoid overheating,- temperature monitoring devices to control the surface temperature.b)devices, which are installed separately from the equipment under control and considered as associated apparatus exclusively for a specific type of protection or specific equipment under control. The combined apparatus is considered as a system.EXAMPLES- external control devices or safety related parts of a control system for type of protection pressurisation,- overload protective device for electric motors of type of protection Ex e ‘Increased Safety’,- control devices for battery charging equipment (protection against overcharging or deep discharging),- level detectors for the control of submersible pumps.Exclusions from this standard:Safety devices, where the safety function is adequately covered in the existing standards of EN 60079 and EN 61241 series do not need any additional assessment according to this standard.EXAMPLESIntrinsically safe associated apparatus, fuses, electromechanical overload protection, simple thermal protection devices (e.g. thermal fuses, thermal switches).The standard does not include devices or systems to prevent the occurrence of explosive atmospheres, e.g. inerting systems, ventilation in workplaces and containers/vessels.Gas detectors, which are covered under EN 61779 series, EN 50271 or EN 50402 are also excluded from the scope of this standard.This standard does not deal with protection by control of ignition source ‘b’ for non-electrical equipment as defined in EN 13463-6.

Committee
CLC/TC 31
DocumentType
Standard
PublisherName
European Committee for Standards - Electrical
Status
Current

Standards Relationship
DIN EN 50495 : 2010-10 Identical
NEN EN 50495 : 2010 Identical
CEI EN 50495 : 2011 Identical
NBN EN 50495 : 2010 Identical
NF EN 50495 : 2010 Identical
VDE 0170-18 : 2010-10 Identical
BS EN 50495:2010 Identical
PN EN 50495 : 2013 Identical
SN EN 50495 : 2010 Identical
UNE-EN 50495:2010 Identical
I.S. EN 50495:2010 Identical

PREN 1127-1 : DRAFT 2017 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
17/30365866 DC : 0 BS EN 1127-1 - EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
BS EN 1755:2015 Industrial Trucks. Safety requirements and verification. Supplementary requirements for operation in potentially explosive atmospheres
UNE-EN 1127-1:2012 Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology
DIN EN 1127-2:2002-07 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
CLC/TR 60079-33:2015 Explosive atmospheres - Part 33: Equipment protection by special protection 's'
EN 61800-5-2:2017 Adjustable speed electrical power drive systems - Part 5-2: Safety requirements - Functional
BS EN 61800-5-2:2017 Adjustable speed electrical power drive systems Safety requirements. Functional
13/30278416 DC : 0 BS EN 61800-5-2 - ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS - PART 5-2: SAFETY REQUIREMENTS - FUNCTIONAL
EN 61800-2:2015 Adjustable speed electrical power drive systems - Part 2: General requirements - Rating specifications for low voltage adjustable speed a.c. power drive systems
12/30270980 DC : 0 BS EN 1127-2 - EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
IEC 61800-5-2 REDLINE : 2ED 2016 ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS - PART 5-2: SAFETY REQUIREMENTS - FUNCTIONAL
IEC 60079-33:2012 Explosive atmospheres - Part 33: Equipment protection by special protection 's'
IEC 61800-5-2:2016 Adjustable speed electrical power drive systems - Part 5-2: Safety requirements - Functional
I.S. EN 1127-1:2011 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
NF EN 1127-1 : 2011 EXPLOSIVES ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
IEC 61800-2:2015 Adjustable speed electrical power drive systems - Part 2: General requirements - Rating specifications for low voltage adjustable speed a.c. power drive systems
DIN EN 1755:2016-02 Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres
DIN EN 1127-1:2011-10 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
I.S. EN 1127-2:2014 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
I.S. EN 1755:2015 INDUSTRIAL TRUCKS - SAFETY REQUIREMENTS AND VERIFICATION - SUPPLEMENTARY REQUIREMENTS FOR OPERATION IN POTENTIALLY EXPLOSIVE ATMOSPHERES
VDI 2263 Blatt 7.1:2013-03 Dust fires and dust explosions - Hazards - assessment - protective measures - Fire and explosion protection in spraying and drying integrated equipment - Examples
13/30248785 DC : 0 BS EN 61800-2 - ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS - PART 2: GENERAL REQUIREMENTS - RATING SPECIFICATIONS FOR LOW VOLTAGE ADJUSTABLE FREQUENCY A.C. POWER DRIVE SYSTEMS
BS EN 1127-1:2019 Explosive atmospheres. Explosion prevention and protection Basic concepts and methodology
DIN EN 1127-2:2014-09 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
UNE-EN 1755:2016 Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres
UNI EN 1127-2 : 2014 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
BS EN 61800-2:2015 Adjustable speed electrical power drive systems General requirements. Rating specifications for low voltage adjustable speed a.c. power drive systems
UNI EN 1127-1 : 2011 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 1: BASIC CONCEPTS AND METHODOLOGY
I.S. EN 60079-6:2015 EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
IEC 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
IEC 61800-5-2:2016 RLV Adjustable speed electrical power drive systems - Part 5-2: Safety requirements - Functional
UNE-EN 60079-6:2016 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
BS EN 1127-2:2014 Explosive atmospheres. Explosion prevention and protection Basic concepts and methodology for mining
PD CLC/TR 60079-33:2015 Explosive atmospheres Equipment protection by special protection \'s\'
BS IEC 60079-33 : 2012 EXPLOSIVE ATMOSPHERES - PART 33: EQUIPMENT PROTECTION BY SPECIAL PROTECTION 'S'
EN 1755:2015 Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres
S.R. CLC/TR 60079-33:2015 EXPLOSIVE ATMOSPHERES - PART 33: EQUIPMENT PROTECTION BY SPECIAL PROTECTION 'S'
13/30267448 DC : 0 BS EN 60079-6 ED 4.0 - EXPLOSIVE ATMOSPHERES - PART 6: EQUIPMENT PROTECTION BY LIQUID IMMERSION 'O'
BS EN 60079-6:2007 Explosive atmospheres Equipment protected by oil immersion \'o\'
PREN 1127-2 : DRAFT 2012 EXPLOSIVE ATMOSPHERES - EXPLOSION PREVENTION AND PROTECTION - PART 2: BASIC CONCEPTS AND METHODOLOGY FOR MINING
BS EN 1127-1:2011 Explosive atmospheres. Explosion prevention and protection Basic concepts and methodology
I.S. EN 61800-2:2015 ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS - PART 2: GENERAL REQUIREMENTS - RATING SPECIFICATIONS FOR LOW VOLTAGE ADJUSTABLE SPEED A.C. POWER DRIVE SYSTEMS
EN 1127-2:2014 Explosive atmospheres - Explosion prevention and protection - Part 2: Basic concepts and methodology for mining
EN 1127-1:2011 Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology
EN 60079-6:2015 Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
CEI EN 61800-5-2:2017 Adjustable speed electrical power drive systems Part 5-2: Safety requirements - Functional

IEC 61025:2006 Fault tree analysis (FTA)
EN 60812:2006 Analysis techniques for system reliability - Procedure for failure mode and effects analysis (FMEA)
EN 61508-3:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements
EN 61508-1:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements
EN 60079-10-1:2015 Explosive atmospheres - Part 10-1: Classification of areas - Explosive gas atmospheres
IEC 60079-30-2:2007 Explosive atmospheres - Part 30-2: Electrical resistance trace heating - Application guide for design, installation and maintenance
EN 61508-7:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 7: Overview of techniques and measures
IEC 61511-1:2016+AMD1:2017 CSV Functional safety - Safety instrumented systems for the process industry sector - Part 1: Framework, definitions, system, hardware and application programming requirements
IEC 60812:2006 Analysis techniques for system reliability - Procedure for failure mode and effects analysis (FMEA)
EN 60079-0:2012/A11:2013 EXPLOSIVE ATMOSPHERES - PART 0: EQUIPMENT - GENERAL REQUIREMENTS (IEC 60079-0:2011, MODIFIED)
IEC 61165:2006 Application of Markov techniques
IEC 60079-10-1:2015 Explosive atmospheres - Part 10-1: Classification of areas - Explosive gas atmospheres
IEC 61508-4:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations (see Functional Safety and IEC 61508)
IEC 61241-0:2004 Electrical apparatus for use in the presence of combustible dust - Part 0: General requirements
EN 13237:2012 Potentially explosive atmospheres - Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres
IEC 61508-3:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements (see Functional Safety and IEC 61508)
EN 13463-6:2005 Non-electrical equipment for use in potentially explosive atmospheres - Part 6: Protection by control of ignition source 'b'
EN 50402:2017 Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of gas detection systems
EN 61165:2006 Application of Markov techniques
EN 60079-30-1:2017 Explosive atmospheres - Part 30-1: Electrical resistance trace heating - General and testing requirements
EN 61508-2:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
EN 61496-1:2013/AC:2015 SAFETY OF MACHINERY - ELECTRO-SENSITIVE PROTECTIVE EQUIPMENT - PART 1: GENERAL REQUIREMENTS AND TESTS (IEC 61496-1:2012)
IEC 61709:2017 Electric components - Reliability - Reference conditions for failure rates and stress models for conversion
EN 61025:2007 Fault tree analysis (FTA)
EN 62061:2005/A2:2015 SAFETY OF MACHINERY - FUNCTIONAL SAFETY OF SAFETY-RELATED ELECTRICAL, ELECTRONIC AND PROGRAMMABLE ELECTRONIC CONTROL SYSTEMS (IEC 62061:2005/A2:2015)
EN 50271:2010 Electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen - Requirements and tests for apparatus using software and/or digital technologies
ISO 13849-2:2012 Safety of machinery — Safety-related parts of control systems — Part 2: Validation
IEC 60079-0:2011 Explosive atmospheres - Part 0: Equipment - General requirements
IEC 61709 : 3.0 ELECTRIC COMPONENTS - RELIABILITY - REFERENCE CONDITIONS FOR FAILURE RATES AND STRESS MODELS FOR CONVERSION
EN 61241-0:2006 Electrical apparatus for use in the presence of combustible dust - Part 0: General requirements
IEC 61496-1:2012 Safety of machinery - Electro-sensitive protective equipment - Part 1: General requirements and tests
EN ISO 13849-2:2012 Safety of machinery - Safety-related parts of control systems - Part 2: Validation (ISO 13849-2:2012)
EN ISO 13849-1:2015 Safety of machinery - Safety-related parts of control systems - Part 1: General principles for design (ISO 13849-1:2015)
IEC 60079-30-1:2007 Explosive atmospheres - Part 30-1: Electrical resistance trace heating - General and testing requirements
EN 61709:2017 Electric components - Reliability - Reference conditions for failure rates and stress models for conversion
EN 61010-1:2010 Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
IEC 61508-1:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements (see Functional Safety and IEC 61508)
IEC 62061:2005+AMD1:2012+AMD2:2015 CSV Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems
EN 60079-30-2:2017 Explosive atmospheres - Part 30-2: Electrical resistance trace heating - Application guide for design, installation and maintenance
IEC 61508-7:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 7: Overview of techniques and measures (see Functional Safety and IEC 61508)
IEEE 352-1987 IEEE Guide for General Principles of Reliability Analysis of Nuclear Power Generating Station Safety Systems
IEC 61010-1:2010+AMD1:2016 CSV Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
ISO 13849-1:2015 Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design
IEC 61508-2:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems (see Functional Safety and IEC 61508)
1994/9/EC : 1994 DIRECTIVE 94/9/EC OF THE EUROPEAN PARLIAMENT AND THE COUNCIL OF 23 MARCH 1994 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING EQUIPMENT AND PROTECTIVE SYSTEMS INTENDED FOR USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
EN 61508-4:2010 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations

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