2) Derating Factors for Ambient Temp, altitudes

Derating Factors for Ambient Temp, altitudes.


1) Average ambient temperature




Where,

T1 = temp. Rise at the ambient temp. as referred by the BB manufacturer
T2 = temp. Rise at the ambient temp.where the panel will be installed


2) Derating factors for altitudes

Where busbars are intended for use at high altitudes & is tested near sea level, the limits of temperature rise should be reduced by 1% for each 1000 feet in excess of 3000 feet above sea level at which the busbar is to be installed



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