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How about Masterpact NW performance when altitude less than 2000 Meters?

At altitudes higher than 2000 metres, the modifications in the ambient air (electrical resistance, cooling capacity) lower the following characteristics as follows


Please find attached temperature derating of masterpact NW at 50 degree. Altitude derating is not applicable in your case because altitude is less than 2000M. 
So you may to consider derating at 50 degree not altitude derating.
 
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