Favorable Conditions For Device Installed Inside a Switchboard
The time interval between two preventive maintenance visits can be doubled if all the conditions presented below are met.
The only exception is the check-up program recommended for the fifth year.
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Favorable operating and environmental conditions for device installed inside a switchboard |
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|---|---|
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Temperature |
Average annual temperature <25 °C (77 °F) outside the switchboard (Ti*). The device is installed in an air-conditioned room or in a ventilated enclosure. |
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Percent load |
< 50% of In 8/24 hours or 24/24 hours |
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Relative humidity |
< 50% |
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Corrosive atmosphere |
Device installed in environment category 3C1 or in a closed room that creates favorable conditions (air is conditioned and purified) |
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Salt environment |
None |
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Dust |
Negligible Device installed in a switchboard equipped with filters or a ventilated IP54 enclosure |
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Vibration |
None |
Example depending on the conditions:
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Normal: check on charging time = 2 years
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Favorable: check on charging time = 2 x 2 = 4 years