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Spurious RCD trip due to capacitance

Stephen Biddle
Hi All


I've been asked a question re RCD trip, as follows:  

The issue is that in some cases where we have really long runs of cables the capacitive current is calculated to be greater than 100mA. Therefore setting the earth leakage protection down to 100mA would cause nuisance tripping.


By my calcuation for 60 Hz and 400 V you'd need about 700 nF


Has anyone got any experience of this?
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  • 0
    I've got a suspicion that the 3 phase might balance out the resultant electric field to zero.  Or is that just wishfull thinking?
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  • 0
    I've got a suspicion that the 3 phase might balance out the resultant electric field to zero.  Or is that just wishfull thinking?
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