This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
To ascertain that our products can reach acceptable average lifetime, the ambient air concentration of a given corrosive gas must comply with following limits: ---
H2S: Concentration < 0,1mg/m3 (=~ 10ppm)
Max ambient conditions: 40°C & 85%HR.
These are the General environmental conditions as per IEC 60721-3-3 and our products confirms to IEC 60721-3-3 by design.
If the concentration is higher in the environment then the specified limit, use minimum an IP54 enclosure with pressurization system to avoid the sulphur atmosphere to get in the enclosure.
The best solution will be to use IP6* enclosure. Place the contactors/ MPCB (and all electrical parts with contacts) in a control room where the air is cleaned, providing a ventilation free off or within the acceptable limits of H2S gas concentrations.
Released for: Schneider Electric Egypt and North East Africa
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