1st Edition, 1987
A Method of Temperature-rise Assessment by Extrapolation for Partially Type-Tested Assemblies (PTTA) of Low-Voltage Switchgear and Controlgear
Includes all amendments and changes through Amendment 1, February 1995
Superseded By: IEC TR 60890
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Description / Abstract:
The following method is applicable to enclosed PTTA or partitioned sections of PTTA without forced ventilation.