Correction of Rated Continuous Current. When a line trap test temperature rise is not provided by the manufacturer, the ratings may be adjusted as follows: r I = Ir (θ /θ )1/ n Where, I = Adjusted rated continuous current corrected to the maximum temperature rise allowed for a normal rating in the event the temperature rise tested at the factory is less than the maximum allowed temperature rise. Ir = Rated continuous current (nameplate rating) that a line trap can carry continuously without exceeding its limits of observable temperature rise. This value is given by the manufacturer. θ = The Steady-state temperature-rise above ambient temperature when tested at rated continuous current (nameplate rating) in the factory.
Correction of Rated Continuous Current. When a line trap test temperature rise is not provided by the manufacturer, the ratings may be adjusted as follows: r I = Ir / 1/ n Where, I = Adjusted rated continuous current corrected to the maximum temperature rise allowed for a normal rating in the event the temperature rise tested at the factory is less than the maximum allowed temperature rise. Ir = Rated continuous current (nameplate rating) that a line trap can carry continuously without exceeding its limits of observable temperature rise. This value is given by the manufacturer. = The Steady-state temperature-rise above ambient temperature when tested at rated continuous current (nameplate rating) in the factory. r corresponding to I. = Limit of observable temperature rise at rated continuous current n = 1.8 ( A factor or constant) For subsequent calculations, the adjusted rated continuous current should be used when test data are available.
