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Extronics Ltd
Meridian House , Roe Street
Congleton, CW12 1PG, UK.
Tel: ++ 44 (0) 1260 297274
Fax: ++ 44 (0) 1260 297280
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Explosion
Protection
Concepts
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- For Europe: CENELEC / ATEX Directive
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Gas Group
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Temperature
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Typical
material
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Apparatus
group
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Max.
surface
temperature
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- T-
Class
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Classification
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ATEX
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-
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- Methane
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- I
Mining
(M1/M2)
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-
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- 450°C
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- T1
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-
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- Propane
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- IIA
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-
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- 300°C
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- T2
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CE Marking Directive
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Basic requirements
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- Ethylene
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- IIB
Surface
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- 200°C
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- T3
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Low Voltage
Directive
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Electrical safety of equipment,
voltage ranges 50-1000AC, 75-1500 DC
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- Hydrogen
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IC
Applications
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- 135°C
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- T4
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EMC Directive
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- Electromagnetic emissions and immunity
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- Acetylene
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- IIC
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- 100°C
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- T5
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Machinery
Directive
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- Mechanical and electrical safety
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- All
Gases
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- II
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- 85°C
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- T6
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Atex Directive
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- Hazardous Area Equipment (mandatory form
1st July 2003 Currently accepted
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EEx
ed IIB
T4
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  II
1G
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**** 4 Digit body number
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- Protection
Concepts
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- Symbol
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- Zone
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- Standard
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- How
it works
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Category |
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- Increased
Safety
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- Ex
e
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- 1
& 2
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- EN 50019
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- No
arcs, sparks or hot surfaces
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2
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- Non-sparking
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- Ex
nA
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- 2
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- EN 50021
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3
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- Flameproof
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- Ex
d
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- 1
& 2
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- EN 50018
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- Contain
the explosion and quench flame
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2
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-
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- Enclosed
Break
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- Ex
nW
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- 2
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- EN 50021
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3
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- Quartz/Sand
Filled
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- Ex
q
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- 1
& 2
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- EN 50017
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2
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- Intrinsic
Safety
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Ex
ia
- Ex
ib
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- 0,1
& 2
- 1 & 2
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- EN 50020
- EN 50039
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- Limit
energy of sparks; limit the temperature
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- 1
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- 2
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- 3
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- Energy
Limitation
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- Ex
nL
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- 2
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- EN 50021
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- Pressurised
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- Ex
p
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- 1
& 2
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- EN 50016
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- Keep the flammable
gas away from any hot surfaces and ignition
Capable
equipment
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2
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- Simplified
Pressurisation
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- Ex
nP
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- 2
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- EN 50021
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3
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- Encapsulation
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- Ex
m
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- 1
& 2
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- EN 50028
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2
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-
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- Oil
Immersion
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- Ex
o
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- 1
& 2
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- EN 50015
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2
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- Restricted
breathing
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- Ex
nR
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- 2
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- EN 50021
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3
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- Special
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- Ex
s
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- 0*,1&2
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- EHSR (ATEX)
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- Any Proven Method
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1,2&3
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- * Label must indicate Zone 0
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Classification |
Criteria For Zone |
ATEX Marking |
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Zone
0 |
Flammable
material always present or for long periods (e.g.1000 hours or more
per year) |
G |
Category
1
Equipment |
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Zone
20 |
D |
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Zone
1 |
Flammable
material present in normal operation (e.g. 10-1000 hours/year) |
G |
Category
2
Equipment |
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Zone
21 |
D |
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Zone
2 |
Flammable
material present for short periods only (e.g. less than 10 hours/year) |
G |
Category
3
Equipment |
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Zone
22 |
D |
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- For North
America
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- PROTECTION
METHODS
INTRINSICALLY SAFE
Ex ia IIC T4
(Method of protection)
Class I, Division 1
(Area Classification)
Groups A, B, C and D
(Gas Grouping)
T4
(Temperature Code)
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- North
America
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- Method
of
Protection
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- Division
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- Intrinsic
Safety
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- 1
or 2
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- Explosion-Proof
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- 1
or 2
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- Pressurization
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- 1
or 2
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- Non-Incendive
Circuits
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- 2
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- *Specifically
Assessed
Equipment
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- North
America, CENELEC (Europe) and IEC
(International)
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- Method
of Protection
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- Zone
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- Code
Letter
CENELEC/IEC
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- Intrinsic
Safety
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- 0,
1 or 2
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- ia
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- 1
or 2
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- ib
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- Flame-Proof
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- 1
or 2
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- d
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- Pressurization
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- 1
or 2
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- p
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- Increased
Safety
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- 1
or 2
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- e
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- (*No
excessive Heat Generating Devices or
Ignition-capable Arcing / Sparking Devices)
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- AREA
CLASSIFICATION
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-
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- CONTINUOUS
HAZARD
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- INTERMITTENT
HAZARD
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- HAZARD
UNDER
ABNORMAL CONDITIONS
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- NORTH
AMERICA
(CEC/NEC)
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- Division
1
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- Division
2
or Zone 2
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- Zone
0
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- Zone
1
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- CENELEC/IEC
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- Zone
0
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- Zone
1
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- Zone
2
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- HAZARDOUS
LOCATIONS GAS GROUPS
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- TYPICAL
GAS HAZARD
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- NORTH
AMERICA
CEC SECTION 18, NEC ARTICLE 500
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- CENELEC/IEC
CENELEC, EN 50014,
IEC 79-0
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- ACETYLENE
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- A or
IIC
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- IIC
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- HYDROGEN
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- B or
IIC
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- IIC
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- ETHYLENE
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- C or
IIB
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- IIB
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- PROPANE
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- D or
IIA
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- IIA
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- METHANE
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- Group
D (gaseous mines) or I
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- I
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- TEMPERATURE
CODE/CLASS
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- MAXIMUM
SURFACE TEMPERATURE (°C)
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- 450
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- 300
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280 |
260 |
230 |
215 |
- 200
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180 |
165 |
160 |
- 135
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120 |
- 100
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- 85
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- NORTH
AMERICA
Temp Code
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- T1
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- T2
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T2A |
T2B |
T2C |
T2D |
- T3
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T3A |
T3B |
T3C |
- T4
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T4A |
- T5
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- T6
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- CENELEC/IEC
Temp Class
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- T1
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- T2
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- T3
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- T4
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- T5
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- T6
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