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Page Title:
Table 5-6. Summary of typical combustible dust hazardous atmospheres. |
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|  DOE-HDBK-1092-2004
Table 5-6. Summary of typical combustible dust hazardous atmospheres.a
Class
Division
Group
Temperature, atmosphere
Covered
Measured
Limiting value
Eb
II Combustible
1 (Normally
Atmospheres containing combustible
Devices not
Maximum
Shall be less than
dust
hazardous)
dusts regardless of resistivity, or
subject to
ambient
ignition-temperature
other combustible dusts of similarly
temperature in
dust but not more
hazardous characteristics having
(switches,
40C ambient
than:
meters)
with a dust
centimeter
blanket
No overload:
b
F
Atmospheres containing
Devices subject
E--200C (392F)
carbonaceous dusts having resistivity
to overload
F--200C (392F)
between 102 and 108 ohm-centimeter
(motors,
G--165C (329F)
Gb
Atmospheres containing dusts having
Possible overload in
resistivity of 108 ohm-centimeter
operation:
Normal:
E--200C (392F)
F--150C (302F)
G--120C (248F)
Abnormal
E--200C (392F)
F--200C (392F)
G--165C (329F)
2 (Not
F
Atmospheres containing dusts having
Lighting fixtures
Maximum
normally
resistivity of 105 ohm-centimeter
external
hazardous)
temperature
under conditions
of use
G
Same as Division 1
a
Chart from Crouse-Hinds ECM Code Digest, 1990.
b
NEMA Enclosures Type 9 shall be used for Class 11 Groups E, F, or G.
5-22
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