Hi, Brian. You might want to ask this question in the U.K. Forum of ET. We don't use RCD mains here, or ring circuits, like you guys do. Good luck.
Brian could you give some more info?Hi guys
I've recently competed an installation on a large domestic property
I've now found that one of the Rcds is tripping every 2 or 3 days
I've isolated a ring main circuit and the rcd is fine.
I've carried out insulation test on circuit L-N L-E N-e all clear
But when I test between cpc of the disconnected circuit and neutral bar at cu I get a reading of 4-5MOhm on both outgoing legs
I've split the ring into to 2 radials,but still get this reading on both halves
I've also got 50V between disconnected earth and neutral bar
Any ideas guys
Tell us more about this 50v your measuring between earth and neutral?
This should not be !
Exactly where are you measuring this ?
And with what are you measurimg ?