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yeh domestic no inductive loads it a 3 phase board being being used as a single.ive been back this morning to see customer advise them of problems and told them at least to have the type c replaced with type b they said thy will think about it what more can i do 

Tks for replys. The it is a 32a type c rcbo. Ze is 0.31 tncs. dont know why type c. Zs is way bhigh 3.14 but i guessing that due to resistance thro rcbo as i quickly check two other circuits protected by same type rcbos and ive come across this quite a few times either a rcd or rcbo pushing up...

As this a ring it is basicly a radial circuit wired in 5mm2 cable so what is the maximum length from cu to furthest point   

so the R1+R2=0.98 / 19.51  x 1000 = 50.2m  at furtest point not end to end length sorry rfc cals always confuse me  

i was working out length by the end to end of r1 or rn being 1.42 then dividing by resistance of 2.5 being 7.41 then multiply by 1000 or am i doing it wrong. it is a big detached property and it could be a lengthy run but didnt think 191m also concern about voltdrop if the length is correct. 

cheers for reply how do you get to that?

Hello people checking a rfc circuit today 2.5/1.5 t&e r1=1.42 rn=1.41 r2=2.33 R1+R2=0.98 my concern is cable length1.42/7.41=191m or am i not calculating it correctly. Ta