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i have disconnected each cct L/N AND E. meggered phase/neutral, phase/earth and neutral/earth with 500v all clear with <300meg. with all ccts isolated and only one ring main connected ramp tested rcd and still tripping between 21 and 23ms.

rcd tripping for no apparant reason i have checked all ccts ok the supply is a TT sysyem and so are the neighbours. earth rod fitted. measured tripping current using ramp test, tripped at 21mA. checked at 1/2 tripping current no trip untill pc plugged in. however rcd has tripped with pc...