Many considerations must be made when adjusting rated currents in assemblies placed in alternative ambient air temperatures.
Of course, the currents should be either in or decreased depending on whether the ambient air temperature is above or below the 35°C used in temperature rise tests. The real question is how much the rated current should be adjusted and which parts in a circuit should be included when making the adjustments?
In this miniguide, our technical instructor René Jensen, who is a member of the IEC maintenance team responsible for the 3rd edition of IEC 61439-1, explains how you easily can calculate adjustments of rated currents for alternative ambient air temperatures.
The miniguide explains the formula used for calculating adjustments of rated currents for alternative ambient air temperatures. It also includes detailed examples of how to calculate adjustments in temperatures both above and below 35°C.
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