AEMT - Association of Electrical and Mechanical Trades

Standards for Hazardous Areas

Index

General Hazardous Area Standards Apparatus Protection Concepts Miscellaneous

Basic Concepts and Methodology

General Requirements

Installation in Hazardous areas

Maintenance and Inspection

Repair and Overhaul of Hazardous Area Apparatus

Testing of HV machines

Zoned Areas

Flameproof: Ex 'd'

Ex 'd' - American Standard

Increased Safety: Ex 'e'

Intrinsic Safety: Ex 'i'

Non Sparking. Ex 'N' or 'n'

Encapsulation. Ex 'm'

Oil Immersion. Ex 'o'

Pressurised. Ex 'p'

Powder filled. Ex 'q'

Combustible Dust. Ex 'D'

Mechanical Protection Concepts

Safety Critical Control Systems

Miscellaneous

General Hazardous Area Standards

Basic Concepts and Methodology

  Standard.   Date Description:
BS EN 1127 1 1998 Explosive Atmospheres. Explosion Prevention & protection. Basic concepts & methodology
BS EN 1127 1 2007 Explosive Atmospheres. Explosion Prevention & protection. Basic concepts & methodology
BS EN 1127 1 2011 Explosive Atmospheres. Explosion Prevention & protection. Basic concepts & methodology
BS EN 1127 2 2002 (+A1:2008 amend) Explosive Atmospheres & protection. Basic concepts and methodology for mining.
BS EN 1127 2 2014 Explosive Atmospheres & protection. Basic concepts and methodology for mining.




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General Requirements

  Standard.   Date Description:
BS 5501 1 1977 Electrical Apparatus for explosive atmospheres. General requirements.
EN 50014 1977 Identical to BS 5501:1977
BS EN 50014 1993 Electrical Apparatus for explosive atmospheres. General requirements.
BS EN 50014 1998 Electrical Apparatus for explosive atmospheres. General requirements.
BS EN IEC 60079 0 2004 Electrical Apparatus for explosive atmospheres. General requirements.
BS EN IEC 60079 0 2006 Electrical Apparatus for explosive atmospheres. General requirements.
BS EN 60079 0 2009 Electrical Apparatus for explosive atmospheres. General requirements.
IEC 60079 0 2007 Identical to BS EN 60079:2009
BS EN 60079 0 2012 Explosive atmospheres. Equipment. General requirements + 2013 Update




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Installation in Hazardous areas

  Standard.   Date Description:
BS  5345 1 1989 Selection, Installation & maintenance of electrical apparatus for explosive atmospheres, General recommendations.
BS 5345 3 1979 Installation & Maintenance requirements of electrical equipment with protection 'd'
BS 5345 4 1977 Installation & Maintenance requirements of electrical equipment with protection 'i'
BS 5345 5 1983 Installation & Maintenance requirements of electrical equipment with protection by pressurisation, 'p'
BS 5345 6 1978 Installation & Maintenance requirements of electrical equipment with protection 'e'
BS 5345 7 1979 Installation & Maintenance requirements of electrical equipment with protection 'N'
BS 5345 8 1980 Installation & Maintenance requirements of electrical equipment with special protection 's'
BS EN 60079 14 2003 Electrical apparatus for explosive gas atmospheres. Electrical installations in hazardous areas (other than mines).
IEC 60079 14 2002 Identical to BS EN 60079-14:2003
BS EN  60079 14 2008 Explosive atmospheres. Electrical installations design, selection & erection.



(BS 5345, parts 1 to 9 were withdrawn on 15/1/2000, but are still valid for exisiting installations before that date.)
IEC 60079 14 2007 Identical to BS EN 60079-14:2008
BS EN 60079 14 2014 Explosive atmospheres. Electrical installations design, selection & erection.




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Maintenance and Inspection

  Standard.   Date Description:
BS EN 60079 17 2003 Electrical apparatus. Inspection & Maintenance of electrical installations in hazardous areas (other than mines)
IEC 60079 17 2002 Identical to BS EN 60079-17:2003
BS EN 60079 17 2007 Explosive atmospheres. Electrical installations inspection and maintenance
IEC 60079 17 2007 Identical to BS EN 60079-17:2007
BS EN 60079 17 2014 Explosive atmospheres. Electrical installations inspection and maintenance
IEC 60079 17 2013 Identical to BS EN 60079-17:2014




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Repair and Overhaul of Hazardous Area Apparatus

When repairing an Ex motor to standard as per BS EN IEC 60079 19, the standard date closest to the year of manufacture should be used, even if withdrawn or obsolete.

  Standard.   Date Description:
BS 7924 1999 Code of practice for the repair and overhaul of certified electrical apparatus intended for use in mines susceptible to firedamp
BS IEC 60079 19 1993 Electrical apparatus. Repair & Overhaul for apparatus used in explosive atmospheres (other than mines)



(Derived from AEMT/BEAMA Code of practice).
BS EN 60079 19 2007 Explosive atmospheres-Equipment repair, overhaul and reclamation



(Derived from AEMT/BEAMA Code of practice).
IEC 60079 19 2006 Identical to BS EN 60079-19:2007
BS EN 60079 19 2011 Explosive atmospheres-Equipment repair, overhaul and reclamation
IEC 60079 19 2010 Explosive atmospheres-Equipment repair, overhaul and reclamation




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Testing of HV machines

  Standard.   Date Description:
DD ENV 50269 1997 Assessment & representative testing of high voltage machines.




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Zoned Areas

  Standard.   Date Description:
BS  5345 2 1983 Code of practice for selection, installation and maintenance of electrical apparatus for use in potentially explosive atmospheres (other than mining applications or explosive processing and manufacture). Classification of hazardous areas
BS EN 60079 10 2003 Electrical apparatus for explosive gas atmospheres. Classification of hazardous areas
IEC 60079 10 2002 Identical to BS EN 60079-10:2003
BS EN 60079 10-1 2009 Explosive atmospheres. Classification of areas. Explosive gas atmospheres
IEC 60079 10-1 2008 Identical to BS EN 60079-10-1:2009
BS EN 60079 10-1 2015 Explosive atmospheres. Classification of areas. Explosive gas atmospheres
BS EN 60079 10-2 2009 Explosive atmospheres. Classification of areas. Combustible dust atmospheres
IEC 60079 10-2 2009 Identical to BS EN 60079-10-12:2009
BS EN 60079 10-2 2015 Explosive atmospheres. Classification of areas. Explosive dust atmospheres




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Apparatus Protection Concepts

Flameproof: Ex 'd'

  • Zones 1&2
  • Contains an explosion and quenches flame.
  • All 'd' standards contain flamepath dimensions as at the date of publication
  • All standards are current with respect to the repair of 'd' machines certified and manufactured to them.
  Standard.   Date Description:
BS 229   1957 Specification. Flameproof enclosure of electrical apparatus
BS 4683 2 1971 Specification for electrical apparatus for explosive atmospheres. The construction and testing of flameproof enclosures of electrical apparatus
BS 5501 5 1977 Electrical apparatus for potentially explosive atmospheres. Flameproof enclosure 'd'
BS EN 50018 1995 Electrical apparatus for potentially explosive atmospheres. Flameproof enclosures 'd'
BS EN 50018   2000 Electrical apparatus for potentially explosive atmospheres. Flameproof enclosure 'd'
BS EN  60079 1 2004 Electrical apparatus for explosive gas atmospheres. Flameproof enclosures 'd'
IEC 60079 1 2003 Identical to BS EN 60079-1:2004
BS EN 60079 1 2007 Explosive atmospheres. Equipment protection by flameproof enclosures "d"
IEC 60079 1 2007 Identical to BS EN 60079-1:2007
BS EN 60079 1 2014 Explosive atmospheres. Equipment protection by flameproof enclosures "d"




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Ex 'd' - American Standard

  Standard. Date Description:
UL 674 (4th. Edition) 2003 Electric motors and Generators for use in Division 1 Hazardous(Classified) locations.
UL 674 (5th. Edition) 2011 Electric motors and Generators for use in Division 1 Hazardous(Classified) locations.




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Increased Safety: Ex 'e'

  • Zones 1 & 2
  • No arcs, sparks, or hot surfaces.
  Standard.   Date Description:
BS 4683 4 1973 Specification for electrical apparatus for explosive atmospheres. Type of protection 'e'
BS 5501 6 1977 Electrical apparatus for potentially explosive atmospheres. Increased safety 'e'
BS 5000 15 1980 Rotating electrical machines of particular types or for particular applications. Machines with type of protection 'e' (increased safety)
BS EN  50019 1994 Electrical apparatus for potentially explosive atmospheres. Increased safety 'e'
BS EN 50019 2000 Electrical apparatus for potentially explosive atmospheres. Increased safety 'e'
BS EN 60079 7 2003 Electrical apparatus for explosive gas atmospheres. Increased safety 'e'
IEC 60079 7 2001 Identical to BS EN 60079-7:2003
BS EN  60079 7 2007 Explosive atmospheres. Equipment protection by increased safety 'e'
IEC 60079 7 2006 Identical to BS EN 60079-7:2007
IEC 60079 7 2015 Explosive atmospheres. Equipment protection by increased safety "e"
BS EN 60079 7 2015 Explosive atmospheres. Equipment protection by increased safety "e"




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Intrinsic Safety:  Ex 'i'

  • Zones 0, 1 & 2
  • Limit ignition energy.
  Standard.   Date Description:
BS EN  50020 1995 Electrical apparatus for potentially explosive atmospheres. Intrinsic safety 'i'
BS EN  50020 2002 Electrical apparatus for potentially explosive atmospheres. Intrinsic safety 'i'
BS EN  60079 25 2004 Electrical apparatus for explosive gas atmospheres. Intrinsically safe systems
IEC 60079 25 2003 Identical to BS EN 60079-25:2004
BS EN 60079 11 2007 Explosive atmospheres . Equipment protection by intrinsic safety "i"
IEC 60079 11 2006 Identical to BS EN 60079-11:2007
BS EN 60079 25 2010 Electrical apparatus for explosive gas atmospheres. Intrinsically safe systems
BS EN 60079 11 2012 Explosive atmospheres . Equipment protection by intrinsic safety "i"
IEC 60079 11 2011 Identical to BS EN 60079-11:2012




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Non Sparking. Ex 'N' or 'n'

  • Zone 2.
  • No arcs, sparks, or hot surfaces.
  Standard.   Date Description:
BS 5000 16 1985 Rotating electrical machines of particular types or for particular applications. Rotating electrical machines with type of protection 'N'
BS 6941 1988 Specification for electrical apparatus for explosive atmospheres with type of protection N
BS 5000 16 1997 Rotating electrical machines of particular types or for particular applications. Rotating electrical machines with type of protection 'N'
BS EN 50021 1999 Electrical apparatus for potentially explosive atmospheres. Type of protection 'n'
BS EN 60079 15 2003 Electrical apparatus for explosive gas atmospheres. Type of protection 'n'
BS EN 60079 15 2005 Electrical apparatus for explosive gas atmospheres. Construction, test and marking of type of protection "n" electrical apparatus
IEC 60079 15 2005 Identical to BS EN 60079-15:2005
BS EN 60079 15 2010 Electrical apparatus for explosive gas atmospheres. Construction, test and marking of type of protection "n" electrical apparatus




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Encapsulation. Ex 'm'

  • Zone 1 & 2.
  • Isolate apparatus from atmosphere.
  Standard.   Date Description:
BS EN  60079 18 2004 Electrical apparatus for explosive gas atmospheres. Construction, test and marking of type of protection encapsulation "m" electrical apparatus
IEC 60079 18 2004 Identical to BS EN 60079-18:2004
BS EN 60079 18 2009 Explosive atmospheres. Equipment protection by encapsulation "m"
IEC 60079 18 2014 Explosive atmospheres. Equipment protection by encapsulation "m"
BS EN 60079 18 2015 Explosive atmospheres. Equipment protection by encapsulation "m"




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Oil Immersion. Ex 'o'

  • Zone 1 & 2.
  • Atmosphere exclusion.
  Standard.   Date Description:
BS EN 50015 1994 Electrical apparatus for potentially explosive atmospheres. Oil immersion 'o'
BS EN 50015 1998 Electrical apparatus for potentially explosive atmospheres. Oil immersion 'o'
BS EN 60079 6 2007 Explosive atmospheres. Equipment protected by oil immersion 'o'
IEC 60079 6 2007 Identical to BS EN 60079-6:2007
IEC 60079 6 2015 Explosive atmospheres. Equipment protection by liquid immersion “o”
BS EN 60079 6 2015 Explosive atmospheres. Equipment protection by liquid immersion “o”




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Pressurised. Ex 'p'

  • Zone 1 & 2.
  • Excludes atmosphere.
  Standard.   Date Description:
BS 5501 3 1977 Electrical apparatus for potentially explosive atmospheres. Pressurised apparatus 'p'
BS EN 50016 1996 Electrical apparatus for potentially explosive atmospheres. Pressurised apparatus 'p'
BS EN 50016 2002 Electrical apparatus for potentially explosive atmospheres. Pressurised apparatus 'p'
BS EN 60079 2 2004 Electrical apparatus for explosive gas atmospheres. Pressurised enclosures 'p'
BS EN 60079 2 2007 Explosive atmospheres. Equipment protection by Pressurised enclosure 'p'
IEC 60079 2 2007 Identical to BS EN 60079-2:2007
BS EN 60079 2 2014 Explosive atmospheres. Equipment protection by Pressurised enclosure 'p'




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Powder filled. Ex 'q'

  • Zone 1 & 2
  • Quench ignition and prevent propagation.
  Standard.   Date Description:
BS EN  50017 1994 Electrical apparatus for potentially explosive atmospheres. Powder filling 'q'
BS EN 50017 1998 Electrical apparatus for potentially explosive atmospheres. Powder filling 'q'
BS EN 60079 5 2007 Explosive atmospheres. Equipment protection by powder filling 'q'
IEC 60079 5 2007 Identical to BS EN 60079-5:2007
BS EN 60079 5 2015 Explosive atmospheres. Equipment protection by powder filling 'q'




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Combustible Dust. Ex 'D'

  • Zones 21 & 22
  Standard.   Date Description:
BS EN  61241 2-2 1996 Electrical apparatus for use in the presence of combustible dust. Test methods. Method for determining the electrical resistivity of dust in layers
BS EN 61241 1 2004 Electrical apparatus for use in the presence of combustible dust. Protection by enclosures 'tD'
IEC 61241 1 2004 Identical to BS EN 61241:2004
BS EN 61241 4 2006 Electrical apparatus for use in the presence of combustible dust. Type of protection 'pD'
IEC 61241 4 2006 Identical to BS EN 61241:2006
BS EN 61241 10 2004 Electrical apparatus for use in the presence of combustible dust. Classification of areas where combustible dusts are or may be present
BS EN 61241 14 2004 Electrical apparatus for use in the presence of combustible dust. Selection and installation
IEC 61241 14 2004 Identical to BS EN 61241-10:2004
BS EN 61241 18 2004 Electrical apparatus for use in the presence of combustible dust. Protection by encapsulation 'mD'
IEC 61241 18 2004 Identical to BS EN 61241-18:2004
BS EN 60079 10-2 2009 Explosive atmospheres. Classification of areas. Combustible dust atmospheres
BS EN 60079 31 2009 Explosive atmospheres. Equipment dust ignition protection by enclosure 't'
IEC 60079 10-2 2009 Identical to BS EN 60079-10-2:2009
BS EN 60079 31 2014 Explosive atmospheres. Equipment dust ignition protection by enclosure 't'
BS EN 60079 10-2 2015 Explosive atmospheres. Classification of areas. Combustible dust atmospheres




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Mechanical Protection Concepts

  • Zones 1 &21 or 2* & 22*(fr)
  Standard.   Date Description:
BS EN  13463 1 2001 Non-electrical equipment for potentially explosive atmospheres. Basic method and requirements
BS EN  13463 1 2009 Non-electrical equipment for use in potentially explosive atmospheres. Basic method and requirements
BS EN  13463 2 2004 Non-electrical equipment for use in potentially explosive atmospheres. Protection by flow restricting enclosure 'fr'  *
BS EN 13463 3 2005 Non-electrical equipment for use in potentially explosive atmospheres. Protection by flameproof enclosure 'd'
BS EN 13463 5 2003 Non-electrical equipment intended for use in potentially explosive atmospheres. Protection by constructional safety 'c'
BS EN 13463 5 2011 Non-electrical equipment intended for use in potentially explosive atmospheres. Protection by constructional safety 'c'
BS EN 13463 6 2005 Non-electrical equipment for potentially explosive atmospheres. Protection by control of ignition source 'b'
BS EN 13463 8 2003 Non-electrical equipment for potentially explosive atmospheres. Protection by liquid immersion 'k'




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Safety Critical Control Systems

  • Zones 0, 1, & 2
  Standard.   Date Description:
BS EN 61508 1 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. General requirements
IEC 61508 1 1998 Identical to BS EN 61508-1:2002
BS EN 61508 1 2010 Functional safety of electrical/electronic/ programmable electronic safety-related systems. General requirements
IEC 61508 1 2010 Identical to BS EN 61508-1:2010
BS EN 61508 2 2002 Functional safety of electrical/electronic/programmable electronic safety related systems.
Requirements for electrical/electronic/programmable electronic safety related systems.
IEC 61508 2 2000 Identical to BS EN 61508-2:2002
BS EN 61508 2 2010 Functional safety of electrical/electronic/ programmable electronic safety-related systems. Requirements for electrical/electronic/ programmable electronic safety-related systems
IEC 61508 2 2010 Identical to BS EN 61508-2:2010
BS EN  61508 3 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Software requirements
IEC 61508 3 1998 Identical to BS EN 61508-3:2002
BS EN 61508 3 2010 Functional safety of electrical/electronic/ programmable electronic safety-related systems. Software requirements
IEC 61508 3 2010 Identical to BS EN 61508-3:2010
BS EN  61508 4 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Definitions and abbreviations
IEC 61508 4 1998 Identical to BS EN 61508-4:2002
BS EN 61508 4 2010 Functional safety of electrical/electronic/ programmable electronic safety related systems. Definitions and abbreviations
IEC 61508 4 2010 Identical to BS EN 61508-4:2010
BS EN 61508 5 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Examples of methods for the determination of safety integrity levels
IEC 61508 5 1998 Identical to BS EN 61508-5:2002
BS EN 61508 5 2010 Functional safety of electrical/electronic/ programmable electronic safety related systems. Examples of methods for the determination of safety integrity levels
IEC 61508 5 2010 Identical to BS EN 61508-5:2010
BS EN 61508 6 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Guidelines on the application of IEC 61508-2 and IEC 61508-3
IEC 61508 6 2000 Identical to BS EN 61508-6:2002
BS EN 61508 6 2010 Functional safety of electrical/electronic/ programmable electronic safety related systems. Guidelines on the application of IEC 61508-2 and IEC 61508-3
IEC 61508 6 2010 Identical to BS EN 61508-6:2010
BS EN  61508 7 2002 Functional safety of electrical/ electronic/ programmable electronic safety-related systems. Overview of techniques and measures
IEC 61508 7 2000 Identical to BS EN 61508-7:2002
BS EN 61508 7 2010 Functional safety of electrical/electronic/ programmable electronic safety related systems. Overview of techniques and measures
IEC 61508 7 2010 Identical to BS EN 61508-7:2010




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Miscellaneous

  Standard.   Date Description:
BS EN  ISO9001   2015 Quality Management Systems: Requirements
BS EN ISO14001 2015 Environmental management systems. Requirements with guidance for use




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