Looking at the following table where the y-axis list the conductor sizes and the x-axis (A1, A2, B1, B2 …) list the method of installation why is the conductor size 4 and 10 listed twice? Table gives ampere rating for installation method and conductor size. (Anzahl belasteter Adern = number of phases conducting current)
Electrical Panel – Understanding Duplicate Listings of Conductor Sizes 4mm2 and 10mm2
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Best Answer
I received a reply by the VDE publisher. I will post it (although it is in German) and translate it below
Translation:
TLDR: If you install your conductors on walls made of materials other than wood, but which have similar thermal conductivity you can use these values. However you cannot correct these values for ambient temperature or clustering. Because the values are only marginally higher than the corresponding values which give amperage for conductors installed on walls made out of wood, I find their usage questionable.