Over deze norm
Applies to low-voltage switchgear dealt with in IEC Publication 439-1 and the rules for type testing of temperature rise. For technical or economical reasons, this test is performed on some assemblies only, called PTTA (partially type-tested assembly). For the purpose of assessment of the behaviour of the whole equipment, calculation methods including an appendix with examples are dealt with.
|Engelse titel||A method of temperature-rise assessment by extrapolation for partially type-tested assemblies (PTTA) of low-voltage switchgear and controlgear|