Hazardous Area Information

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.

 

Dust Hazard Classifications
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
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
Exclusion
FM3620
Yes
Yes
Yes
Yes
No
Yes

 

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
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

 

Temperature Class
Maximum Surface Temperature
USA NEC 500
USA NEC 505
IEC / EU
450°C
T1
T1
300°C
T2
T2
280°C
T2A
260°C
T2B
230°C
T2C
215°C
T2D
200°C
T3
T3
180°C
T3A
165°C
T3B
160°C
T3C
135°C
T4
T4
120°C
T4A
100°C
T5
T5
85°C
T6
T6
Approx. NEMA to IP Code
equivalency
NEMA Type
IP Code
1
10
2
11
3
54
3R
14
3S
54
4 & 4X
55
5
52
6 & 6P
67
12 & 12K
52
13
54
Note: equivalency not reversible from IP Code toNEMA Type

 

Ingress Protection Codes to IEC 60529
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
8
Continuous submersion to a stated depth

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