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yelloperil

Hi All, I am having problems finding a fault and would appreciate any ideas, I have got an RCD on a ring main and on some sockets all tests are great but on some sockets the RCD is tripping at greater than 40 ms on 5x test any ideas?
 
Yes.
Test at the board.
Your test results are being affected by volt drop, and the resistance of conductors and equipment between where you are testing and the RCD.
 
as spinlondon said test at the board, you dont have to test rcds out in the field also saves you walking back and forth lol
 
how low do you call low?
 
RFCs can sometimes be directly or indirectly cross bonded to other circuits, neutrals can also be shared across circuits. You may have isolate and disconnect both cpc and neutral from the board.
 

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