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BS EN 50495:2010
Current
The latest, up-to-date edition.
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Safety devices required for the safe functioning of equipment with respect to explosion risks
Hardcopy , PDF
English
30-09-2010
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
Defines the requirements of electrical safety devices, which are used to avoid potential ignition sources of equipment in explosive atmospheres.
Committee |
EXL/31
|
DocumentType |
Standard
|
Pages |
42
|
PublisherName |
British Standards Institution
|
Status |
Current
|
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.NOTE1 This 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.NOTE2 Some 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 EN60079 or EN61241 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 (see3.13 for the definition of a complex device).NOTE3 In general the levels of safety required by this standard are considered to be equivalent to those provided by conformity to EN60079-0 or EN61241-0. No increase or decrease of safety is intended or required. Similarly neither increase nor decrease of safety with respect to EN61508 series is intended.Safety devices can be classified in 2 types: devices, which are included as component in the equipment under control (see3.8). The combined apparatus is considered as equipment. EXAMPLES thermal switch or thermistor to avoid overheating, temperature monitoring devices to control the surface temperature. 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 EN60079 and EN61241 series do not need any additional assessment according to this standard. EXAMPLES Intrinsically 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 EN61779 series, EN50271 or EN50402 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 EN13463-6.
Standards | Relationship |
EN 50495:2010 | Identical |
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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