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Hi buzzlightyear, can you expand a little on your post please. Have you conducted any tests like insulation resistance? Is this a circuit you've installed or existing circuit?
 
need far more information. Have you insulation resistance tested to the electrical main earth or to the earth of the micc? What does the cable feed? Could there be a crossed neutral? Is the RCBO faulty (disconnection times met and ramp test)
 
Okay, what is the circuit feeding and all test results obtained, also what other circuits are there and test results.
How many lighting circuits are there? Are there any more rcbo's or rcd's ?
 
to day I have changed a metal cu. micc cable on to rcbo will not set. I then exchange to mcb holds. this existing circuit
What have you changed it from? RCBO detects earth leakage MCB detects Overcurrent, so swapping from RCBO to mcb tells you what exactly, not rocket science is it?
 

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