Operating Conditions; Temperature; Humidity; Altitude Conditions - Siemens SENTRON Manual
Transfer switching equipment and load transfer switches
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- Manual (90 pages) ,
- Configuration manual (80 pages) ,
- Instructions manual (76 pages)
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Appendix
A.2 Operating conditions
A.2
Operating conditions
A.2.1
Temperature
● At a temperature of -20 °C to +40 °C without derating
● At temperatures from - 20 °C to +70 °C, the derating correction factor K
in
The simplified method of calculating the derating is used here:
l
≤ I
thu
In a few cases, specific requirements demand precise derating calculations. Contact
Siemens for this.
A.2.2
Humidity
● At 80 % air humidity and 55 °C, condensation does not take place
● At 95 % air humidity and 40 °C, condensation does not take place
A.2.3
Altitude conditions
● Up to 2000 m no derating
● For higher altitudes, the following derating correction factor must be factored in
216
K
– correction factor
t
0.9
0.8
0.7
x K
th
f
K
– correction factor
a
U
e
I
e
2000 m < A ≤ 3000 m
0.95
0.85
must be factored
t
Temperature
40 °C to 50 °C
50 °C to 60 °C
60 °C to 70 °C
3000 m < A ≤ 4000 m
0.8
0.85
Manual, 08/2017, L1V30368969104A-02
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