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Thank you all .

Hi Lee thanks for your response , Weston power would not provide a main earth so i had to drive an earth rod down into the ground .the soil is very shillety ground so i cannot get the impedance down at the moment. I was told by a senior friend to change the main disconnector to a 100mA RCD ???

Hi Lee the RCD is not timed delayed!!

Sorry can't seem to reply on here

The 100 mA RCD (not timed delayed) was selected for discrimination  the RA is high because of ground type shilety hope the spelling is right , the electrode was driven down about 1200mm 

Hello my name is Andy the NIC EIC help line is closed today so i wondered if anyone could help me please.  I have been working on a barn conversion in South Devon and installed a consumer unit with 30mA RCBO's on every circuit with a 100mA RCD as the main switch and an earth electrode about 4...