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Example of Symbols
Increased - safety Structure
The lighting unit is structured to emphasize greater
airtight safety and temperature rise and prevent
an accidentally generated explosive gas from entering
into the interior of the lighting unit or such a
gas should happen to contact the high - temperature
section of the unit.
| Classification
of Ignition Degree |
| Ignition
degree |
Range
of Ignition point |
| G1 |
over 450กษ |
| G2 |
300กษ ~ 450กษ |
| G3 |
200กษ ~ 300กษ |
| G4 |
135กษ ~ 200กษ |
| G5 |
100กษ ~ 135กษ |
|
| Classification
of Explosion Grade |
| Grade |
Gap
with a25mm-length of path wich permits
a fame propagation |
| 1 |
over 0.6mm |
| 2 |
0.4 ~ 0.6mm |
| 3 |
up to 0.4mm |
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| Grading
of Danger of Inflammable Gases and Vapor |
 |
G1 |
G2 |
G3 |
G4 |
G5 |
| 1 |
Methane,
ethane
propane,benzene,
toluene,methanol
acetone,
ethyl acetate,
carbon monoxide,
ammonia |
Butane,
ethanol,
butanol,
amil acetate |
n-hexane,
gassoline |
Acetoal-dehyde,
ether |
|
| 2 |
Coal gas |
Ethylene,
Ethylene oxide |
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| 3 |
Hydrogen,
water gas |
Acetylene |
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Carbon
bisulfide |
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