IG-247-EN version 02; 08/12/2020
15
General instructions
cms
.21
Normal service conditions
4. Normal service conditions
The
cms
.21 has been designed for use outdoors under
normal working conditions, in accordance with Standard
IEC 62271-1.
In the enclosure, it is understood that normal indoor
conditions in accordance with the standard IEC 62271-1
prevail.
Ambient air temperature:
The ambient air temperature for installation outdoors must
not 40ºC. The mean temperature over a 24 hour
period must not 35ºC. The minimum ambient air
temperature is -10ºC.
Mean air relative humidity value, measured over a 24 hour
period, must not exceed 95 %.
The maximum vapour pressure value, measured over a
period of 24 h, should not exceed a mean of 22 millibars.
The maximum vapour pressure value, measured over a
period of 1 month, should not exceed a mean of 18 millibars.
Degree of contamination:
The degree of contamination must not be in excess of level
II, in accordance with Table 1 of Standard IEC 60815.
Altitude:
The altitude of the place of installation must not exceed
1000 m.
Vibration:
The eff ects of vibrations due to external causes or seismic
movements are insignifi cant.
Solar radiation:
Solar radiation level up to 1000 W/m
2
at midday with a clear
sky.
Ice:
Layer of ice less than 20 mm.
Wind:
Wind speed less than 34 m/s.
In the case of working conditions which are diff erent
to those indicated or which do not appear in these
instructions, it will be necessary to defi ne what they
are and analyse how they aff ect the design of the
cms
.m substation. In the case of special conditions of
use, contact
Ormazabal
.
