RADWAG PUE HX5.EX, User Manual

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9
4.1. ATEX Markings – Symbols Meaning
Electrical equipment
corresponding with one
or
several anti-explosion
mechanical designs
Explosive atmosphere:
G - caused by mixture of
air with vapour, mist
or gas
D - caused by mixture of
air with dust
Symbol of used
explosion proof
mechanical design, e.g.:
mb - hermetic, for operation
in zone 1,2,
tb – protection via housing
for operation in zones
1,2,
e - increased safety
ia - intrinsically safe design
for operation in zone
0,1,2,
ib - intrinsically safe design
for operation in zone 1,2.
Gas explosion group,
examples:
- IIA: propane (T1)
benzene (T3)
butane (T2)
ethanol (T2)
- IIB: ethylene (T2)
- IIC: acetylene (T2)
hydrogen (T1)
or dust, examples:
- IIIA: volatile fuels
- IIIB: non-conductive dust
- IIIC: conductive dust
Max surface temperature:
- for gases it is specified as
temperature class
determining max
surface temperature
of device components
that are in touch with
explosive mixture
:
T1: 450 °C
T2: 300 °C
T3: 200 °C
T4: 135 °C
T5: 100 °C
T6: 85 °C
- for dusts it is
specified as max
measured surface
temp, e.g.:
T60
0
C
Equipment group:
I - to be used
in mines where there's
risk of mine gas explosion
II - to be used
in places where there's
risk of explosion of gases
other than mine gases
Types of
group II devices:
1 - equipment providing
very high protection
level,
- for operation in zone
0,1,2
2 - equipment providing
high protection level,
- for operation in zone
1,2
3 - equipment providing
standard protection
level,
- for operation in zone 2
Protection
class gas
atmosphere:
- Ga
- Gb
- Gc
dust atmosphere:
- Da
- Db
- Dc