somewhere in the street usually
except with a broken neutral the neutral conductor is likely to rise to about half mains voltage as all houses on the street try to find neutral paths via each others' appliances ... can get quite nasty if it lasts long, motors overheating trying to run on low voltage, but many bits of kit with switch mode PSUs carry on regardless.
And also if there is a broken neutral, the RCBO would still work if there was more than 30mA flowing in the live as no current would be flowing in the broken neutral?
it might be flowing in the neutral conductor out of your house, to "somewhere" other than the star point in the substation, so no tripping.
Where do they get the inspectors from, Adam?...
This one was an ex electrician. I have not had a bad one yet. The way he asked the question was I think was to try and catch me out. They are however actually very helpful blokes.
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