Tabulated Guide to Hazardous Area Information
| Hazardous Area / Classified Location Determination | |||||
|
Jurisdiction
|
Source of Hazard | Continuous Hazard |
Intermittent Hazard |
Accidental Hazard |
Standard |
| IEC / EC | Gas | Zone 0 | Zone 1 | Zone 2 | IEC 60079 |
| USA – NEC 505 | NEC 505 | ||||
| Canada | CEC 18 | ||||
| IEC / EC | Dust | Zone 20 | Zone 21 | Zone 22 | IEC 61241 |
| USA – NEC 506 | NEC 506 | ||||
| USA – NEC 500 | Gas, Dust, Fibres & Flyings |
Division 1 | Division 2 | NEC 500 | |
| Canada | CEC 18 | ||||
|
Gas Hazard Classifications
|
|||
|
Representative
Gas |
IEC / EC
|
USA NEC 505
Canada CEC 18 |
USA NEC 500
Canada CEC Annex J |
|
Acetylene
|
Group IIC
|
Class I, Group A
|
|
|
Hydrogen
|
Group IIB+H2
|
Class I, Group B
|
|
|
Ethylene
|
Group IIB
|
Class I, Group C
|
|
|
Propane
|
Group IIA
|
Class I, Group D
|
|
|
Methane
|
Group I*
|
Mining*
|
Mining*
|
|
*Not within the scope of NEC 500 & 505—under jurisdiction of MSHA. Not within the scope of CEC 18.
|
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|
Dust Hazard Classifications
|
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|
Material
|
IEC / EC
60079 |
IEC / EC
61241 |
USA
NEC 506 |
USA NEC 500
Canada CEC 18 |
|
Metal Dusts
|
Group IIIC
|
Group D
|
–
|
Class II, Group E
|
|
Carbonaceous
Dusts |
Group IIIB
|
Group D
|
Class II, Group F
|
|
|
Non-Conductive
Dusts |
Group IIIB
|
Group D
|
Class II, Group G
|
|
|
Fibers & Flyings
|
Group IIIA
|
Group D
|
Class III
|
|
|
Protection Methods – USA under NEC 500
|
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|
Method
|
Basis
|
Standard
|
Division 1
|
Division 2
|
|
Energy limiting
|
FM 3610 /ISA12.02.01
|
Yes
|
Yes
|
|
|
Energy limiting,
mechanical seal |
FM 3611
|
No
|
Yes
|
|
|
Exlosion Proof
|
Containment
|
FM 3615
|
Yes
|
Yes
|
|
Pressurization ‘X’
|
Exclusion
|
FM3620
|
Yes
|
Yes
|
|
Pressurization ‘Y’
|
Yes
|
Yes
|
||
|
Pressurization ‘Z’
|
No
|
Yes
|
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|
Protection Methods, Gas Hazards – USA under NEC 505 / IEC / EU
|
||||||
|
Method
|
Symbol
|
Basis
|
Standard
|
Zone 0
|
Zone 1
|
Zone 2
|
|
ia
|
Limit spark energy and surface temperatures
|
60079-11
|
Yes
|
Yes
|
Yes
|
|
|
ib
|
No
|
Yes
|
Yes
|
|||
|
ic
|
No
|
No
|
Yes
|
|||
|
Energy Limitation
|
nL
|
60079-15
|
No
|
No
|
Yes
|
|
|
e
|
No arcs, sparks, or hot surfaces
|
60079-7
|
No
|
Yes
|
Yes
|
|
|
Non Sparking
|
nA
|
60079-15
|
No
|
No
|
Yes
|
|
|
Flameproof
|
d
|
Contain the explosion, quench the flame
|
60079-1
|
No
|
Yes
|
Yes
|
|
Enclosed Break
|
nC
|
60079-15
|
No
|
No
|
Yes
|
|
|
Sand Filling
|
q
|
Quench the flame
|
60079-5
|
No
|
Yes
|
Yes
|
|
px
|
Exclude the flammable gas
|
60079-2
|
No
|
Yes
|
Yes
|
|
|
py
|
No
|
Yes
|
Yes
|
|||
|
pz
|
No
|
No
|
Yes
|
|||
|
SimplePressurization
|
nZ
|
60079-15
|
No
|
No
|
Yes
|
|
|
Sealing
|
nC
|
No
|
No
|
Yes
|
||
|
Restricted Breathing
|
nR
|
No
|
No
|
Yes
|
||
|
Encapsulation
|
ma
|
60079-18
|
Yes
|
Yes
|
Yes
|
|
|
mb
|
No
|
Yes
|
Yes
|
|||
|
Oil Immersion
|
o
|
60079-6
|
No
|
Yes
|
Yes
|
|
|
|
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|
Ingress Protection Codes to IEC 60529
|
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|
First Numeral:
Protection against solid objects |
Second Numeral:
Protection against liquids |
||
|
0
|
No special protection
|
0
|
No special protection
|
|
1
|
Objects >50mm diameter, e.g. hand
|
1
|
Vertically dripping water
|
|
2
|
Objects >12.5mm diameter, e.g. finger
|
2
|
Dripping water when tilted up to 15°
|
|
3
|
Objects >2.5mm diameter, e.g. tool
|
3
|
Sprayed water up to 60° from vertical
|
|
4
|
Objects >1.0mm diameter, e.g. wire
|
4
|
Splashed water from any direction
|
|
5
|
Dust protected. Ingress insufficient to prevent satisfactory operation
|
5
|
Water projected by 6.3mm nozzle from any direction: 12.5 L/min, 100kPa, 3 min.
|
|
6
|
Dust tight, no ingress permitted
|
6
|
Water projected by 12.5mm nozzle from any direction: 100 L/min, 100kPa, 3 min.
|
|
7
|
Temporary submersion up to 1 meter
|
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|
8
|
Continuous submersion to a stated depth
|
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