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Hi,  I have a C40A three phase circuit (final) with a measured Zs of 0.8 Ohms (0.55 max). Obviously this is too high as per table 41.3.  The supply is a TN-C-S with a measured Ze of 0.71. Obviously the R1+R2 should be around 0.09, and low and behold was measured as such. There is a 300mA RCD in...