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Protection Methods for Potentially Explosive Gas/Vapour Atmospheres
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Protection Method
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North America Class I
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Europe (CENELEC)
International (IEC)
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Div.
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Standard
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Zone
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Standard
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Zone
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Standard
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Canada (CSA)
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US
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Canada (CSA)
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US
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European Norm (EN)
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International (IEC)
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Intrinsic Safety - ia (2 faults)
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1
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C22.2 No. 157
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FM3610/UL913
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0
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E60079-11
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ISA 12.02.01/UL2279
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0
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50020
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60079-11
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Intrinsic Safety - ib (1 fault)
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1
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E60079-11
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ISA 12.02.01/UL2279
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1
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50020
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60079-11
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Explosionproof Flameproof - d
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1
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C22.2 No. 30
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FM3615/UL1203
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1
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E60079-1
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ISA S12.22.01/UL2279
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1
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50018
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60079-1
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Purged Pressurized - p
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1/2
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CSA TIL 13A/NFPA 496
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NFPA 496
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1/2
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E60079-2
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1
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50016
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60079-2
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Increased Safety - e
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1
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E79-7
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ANSI/ISA S12.16.01/UL2279
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1
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50019
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60079-7
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Encapsulation - m
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1
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E79-18
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ISA S12.23.01/UL2279
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1
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50028
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60079-18
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Oil immersion - o
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1
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E79-6
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ANSI/ISA S12.26.01/UL2279
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1
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50015
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60079-6
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Powder filled - q
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1
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E60079-5
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ANSI/ISA S12.25.01/UL2279
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1
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50017
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60079-5
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Non-incendive/non-sparking
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2
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C22.2 No. 213
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FM3611/UL1604
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Protection - n
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2
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E60079-15
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UL2279
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2
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50021
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60079-15
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Special requirements (2 protection methods)
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0
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50284
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Protection Methods for Combustible/Ignitable Dust Atmospheres
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Protection Method
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North America Class II, III
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Europe (CENELEC)
International (IEC)
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Div.
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Standard
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Zone
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Standard
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Canada (CSA)
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US
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European Norm (EN)
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International (IEC)
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Intrinsic Safety - ia
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1
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C22.2 No. 157
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FM3610/UL913
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Dust ignition protection
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1
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C22.2 No. 25 or E61241-1-1
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UL 1203
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20 / 21 / 22
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EN50281-1-1
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61241-1-1
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Purged
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1/2
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NFPA 496
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61241-4
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Dust tight
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2
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C22.2 No. 25 or E61241-1-1
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FM3611/UL1604
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Non-incendive
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2
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FM3611/UL1604
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Hazardous Locations Equipment Marking
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Markings for North America
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Markings for Europe
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Option A: (ZoneSystem)
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ATEX Directive (94/9/EC) on
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Ex ia IIC T4 (Canada)
Class I Zone 0 AEx ia IIC T4 (U.S.)
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Potentially Explosive Atmospheres
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Flammable gas or vapour
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Area classification
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Conformity to U.S. requirements
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Explosion protected
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Protection method - (intrinsic safety)
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Gas group (acetylene & hydrogen)
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Temperature code
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CE marking symbol
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ID No. of Notified Body of the QA system
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EU Explosive Atmospheres symbol
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Surface (non-mining) equipment
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Equipment category
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Type of flammable substance
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Class I
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Zone 0
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A
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Ex
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ia
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IIC
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T4
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...
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II
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1
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G
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Option B: (DivisionSystem)
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CENELEC (European) Directive (76/117/EEC)
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Flammable gas or vapour
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Area Classification
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Gas group -
A: acetylene
B: hydrogen
C: ethylene
D: propane
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Temperature Code
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Conformity to CENELEC standard
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Explosion protected
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Protection method - (intrinsic safety)
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Gas group (acetylene & hydrogen)
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Temperature Class
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EU marking for explosion protection (optional)
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Class I
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Division 1
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Groups A, B, C, D
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T4
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EEx
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EEx
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ia
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IIC
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T4
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ATEX Directive 94/9/EC
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Equipment Group
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Equipment Category and Level of Protection
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Presence of Explosive Atmosphere
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Flammable Substances
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Correlation with Hazardous Areas
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I - Mines
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M1 - very high level of protection
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Presence
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Methane, Dust
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M2 - high level of protection
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Risk of Presence
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II - Surface
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1 - very high level of protection
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Continuous Presence
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G-Gas, Vapours Mist; D-Dust
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Zone 0 (Gas etc.) Zone 20 (Dust)
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2 - high level of protection
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Likely to Occur
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Zone 1 (Gas etc.) Zone 21 (Dust)
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3 - normal level of protection
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Unlikely to Occur
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Zone 2 (Gas etc.) Zone 22 (Dust)
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Ingress Protection (IP) Codes
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First NUMERAL Protection Against Solid Bodies
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SECOND NUMERAL Protection Against Water
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0
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No Protection
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0
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No Protection
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1
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Objects Greater Than 50 mm
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1
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Vertically Dripping
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2
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Objects Greater Than 12.5 mm
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2
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Angled Dripping (15° tilted)
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3
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Objects Greater Than 2.5 mm
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3
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Spraying
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4
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Objects Greater Than 1.0 mm
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4
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Splashing
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5
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Dust-Protected
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5
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Jetting
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6
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Dust-Tight
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6
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Powerful Jetting
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7
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Temporary Immersion
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6
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Continuous Immersion
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Temperature Codes & Classes
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Maximum Surface Temperature (°C)
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US (NEC) Canada (CEC)
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US (NEC) Canada (CEC) IEC, CENELEC
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450
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T1
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T1
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300
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T2
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T2
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280
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T2A
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260
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T2B
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230
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T2C
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215
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T2D
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200
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T3
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T3
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180
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T3A
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165
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T3B
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160
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T3C
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135
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T4
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T4
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120
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T4A
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100
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T5
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T5
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85
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T6
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T6
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Apparatus Grouping
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Typical Gas/Dust/Fibres/Flyings
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US (NEC) Canada (CEC)
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US (NEC) Canada (CEC) IEC, CENELEC
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Acetylene
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Class I, Group A
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Group IIC
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Hydrogen
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Class I, Group B
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Ethylene
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Class I, Group C
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Group IIB
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Propane
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Class I, Group D
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Group IIA
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Methane
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Gaseous Mines*
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Group I*
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Magnesium
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Class II, Group E
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IEC, CENELEC do not subdivide by material types
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Coal
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Class II, Group F
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Grain
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Class II, Group G
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Cotton
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Class III
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*not within scope of NEC or CEC
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Class I - gas/vapour/mist, Class II - dust, Class III - fibres, flyings
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Area Classifications Division vs. Zone
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Type of Area
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NEC and CEC (North America)
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ATEX and IEC
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Continuous Hazard
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Division 1 or Zone 0
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Zone 0
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Intermittent Hazard
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Division 1 or Zone 1
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Zone 1
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Hazard Under Abnormal Conditions
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Division 2 or Zone 2
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Zone 2
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NEMA/CSA/UL Enclosure Types
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Type
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Application
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Abbreviated Definition*
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1
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Indoor
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General Purpose
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2
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Indoor
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Protection against angled dripping water
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3, 3R, 3S
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Indoor/Outdoor
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Protection against rain, snow
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4, 4X
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Indoor/Outdoor
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Protection against rain, snow, hose directed water
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5
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Indoor/Outdoor
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Protection against angled dripping water, dust, fibres, flyings
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6
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Indoor/Outdoor
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Protection against temporary submersion
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6P
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Indoor/Outdoor
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Protection against prolonged submersion
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12, 12K
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Indoor
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Protection against circulating dust, fibres, flyings
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13
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Indoor
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Protection against circulating dust, fibres, flyings, seepage
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*refer to the enclosure standard for detailed definitions - CSA C22.2 No. 94, UL 50
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