6
Classes of external effects
– excerpt from ČSN 33 2000-5-51 ed. 3.
Class:
1) AC1 – elevation above sea level ≤ 2000 m
2) AD7 – water occurrence – shallow dipping
3) AE6
– strong dustiness
4) AF2 – occurrence of corrosive or polluting substances from atmosphere. Presence of corrosive substances is significant.
5) AG2 – medium mechanical stress by impacts – common industrial processes.
6) AH2 – medium mechanical stress by vibrations – common industrial processes.
7) AK2
– serious risk of growth of vegetation and moulds.
8) AL2
– serious danger of the occurrence of animals
(insects, birds, small animals).
9) AM-2-2 – normal level of the signal voltage. No additional requirements.
10) AN2
– medium solar radiation with intensities > 500 W / m
2
and ≤ 700 W / m
2
.
11) AP3
– medium seismic effects; acceleration > 300 Gal ≤ 600 Gal.
12) BA4
– personal abilities. Instructed people.
13) BC3
– frequent contact with the earth potential. Persons coming frequently into contat with
“live“
parts or standing
on a conducting base.
14) BE3
– danger of explosion, production and storage of explosive substances.
MOKPED Ex electric actuators designed for an ambient temperature of -50 ° C to +55 ° C must be resistant to
operating conditions characterized by an ambient temperature range from -50 ° C to +55 ° C.
The actuators are designed with three-phase motors.
The aforementioned actuators will be designated with the letter F at the last place of the supplementary type num-
ber: thus 5232x.xxxxEDF.
In all denominations of explosion-proof design of electric actuators Type No. 5232x.xxxxEDF the designation
of subgroup II of explosion-proof electric device according to ČSN EN 60079-0 changes from IIC to IIB, i.e. to
Ex d IIB T6 Gb.
Corrosion protection
Actuators are standardly delivered with surface treatment corresponding to category of corrosion aggressiveness
C1, C2 and C3 according to ČSN EN ISO 12944-2.
On customer's request is possible to do surface treatment correcponding to category of corrosion aggressiveness
C4, C5-I and C5-M.
In following table is provided and overview of environment for each categories of corrosion aggressiveness accor-
ding to ČSN EN ISO 12944-2.
Corrosion
aggressiveness
level
Example of typical environment
Outdoor
Indoor
C1
Heated buildings with clean atmosphere
(very low)
e.g. offices, shops, schools, hotels.
C2
Atmosphere with low level of pollution.
Unheated buildings, in which may occur
(low)
Mostly outdoor areas.
condensation, e.g. stocks, sports halls.
C3
Urban industrial atmospheres,
Production areas with high humidity and low air
(middle)
mild pollution of sulfur dioxide.
pollution, e.g. food industry, processing
Seaside areas with middle salinity.
factories, breweries.
C4
Industrial areas and seaside areas
Chemical plants, swimming pools,
(high)
with middle salinity.
seaside shipyard.
C5-I
(very high
Industrial areas with high humidity
Buildings or areas with predominantly continuous
– industrial)
and aggressive atmosphere.
condensation and high air pollution.
C5-M
(very high
Seaside areas with high salinity.
Buildings or areas with predominantly
– seaside)
continuous condensation and high air pollution.
