Page 1097 - Sensors and Systems - North American Catalog
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Additional Information
General Explosion Protection Requirements
European Union
North America
Classification of dangers
Explosive mixture in
Group
I:
Firedamp hazardous
mining areas
Group
II:
Other areas except
mining areas
Explosive mixture of air with
CLASS I:
Gases and vapors
CLASS II:
Dust
CLASS III:
Fibers
Ignition hazard due to
sparks
Subclassification for types of protection intrinsic safety/
flameproof enclosure based on minimum ignition current/
maximum permitted gap, under assignment of minimum
ignition energy of representative gases:
Group
I
Methane
Group
IIA Propane
IIB Ethylene
IIC Hydrogen, acetylene
The subclassification also partially applies to the type of
protection "n" (zone 2 apparatus)
Subclassification of the CLASS by ignition energy:
CLASS I Group A
Acetylene
B
Hydrogen
C
Ethylene
D
Methane
CLASS II Group E
Metal dusts
F
Coal dusts
G
Grain dusts
CLASS III
No classification
Ignition hazard due to hot
surfaces
Classification into temperature classes in accordance with IEC 79-8 for maximum surface temperatures at an ambient
temperature of 40 °C under fault conditions:
T1 ≤ 450 °C T2 ≤ 300 °C T3 ≤ 200 °C T4 ≤ 135 °C T5 ≤ 100 °C T6 ≤ 85 °C
Classification of hazardous
areas
Areas classified according to the probability of a potentially explosive atmosphere:
For gases, vapors, mist: (EN 60079-10)
Zone 0
Continuous or long term
1
Occasionally
2
Rarely and short term
For dusts: (EN 1127-1)
Zone 20
Continuous or long term
or often
21
Occasionally
22
Short term or
build-up or
layers of dust
For gases and dusts:
Note (see IEC 79-10):
Continuous or long term equivalent to > 1000 hr/year
Occasionally equivalent to
10 to 1000 hr/year
Rarely or short term equivalent to
< 10 hr/year
Safety-related data
For data on combustible gases and vapors as a basis for grouping according to ignition energy and temperature as well
as flash-point temperature, see:
Redeker, Nabert, Schön/Safety characteristics of
combustible gases and vapors
NFPA 497 M
CSA No. C22-1
Accreditation offices
PTB
Physikalisch-Technische
Bundesanstalt
DMT
Deutsche Montan
Technologie GmbH
BASEEFABritish Approvals Service
for Electrical Equipment in
Flammable Atmospheres
and others
UL
Underwriters Laboratories, USA
FM Factory Mutual Research, USA
CSA Canadian Standards Association
Installation conditions
DIN EN 60079-14 (VDE 0165 Part 1)
for potentially explosive gas atmospheres
DIN EN 50281-1-2 (VDE 0165 Part 2)
for areas with combustible dust
NFPA 70 National Electrical Code
Art. 500
NFPA 493 Standard for intrinsically
safe operations ...
Division 1
Division 2
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