Harsh Conditions and Device Not Installed Inside a Switchboard
The time interval between two preventive maintenance visits must be reduced by half if any of the conditions presented below are present.
|
Harsh operating and environmental conditions |
|
|---|---|
|
Temperature (annual average) |
Average annual temperature around the switchboard: 35 °C to 45°C (95 °F to 113°F) (Ti*) |
|
Percent load |
> 80% of In 8/24 hours or 24/24 hours |
|
Relative humidity |
> 80% |
|
Corrosive atmosphere |
Device installed in environment category 3C3 or 3C4 without any particular protection |
|
Salt environment |
Installation < 10 kilometers from seaside and device without any particular protection |
|
Dust |
High level Device not installed inside an enclosure equipped with filters or a ventilated IP54 enclosure |
|
Vibration |
Continuous vibrations between 0.2 g (0,007 oz) and 0.5 g (0,018 oz) |
Example depending on the conditions:
-
Normal: check on charging time = every 2 years
-
Harsh: check on charging time = 0.5 x 2 = 1 (every year)