T
tbs1983
Advice required as my fault finding experience isn't as vast as many on this forum.
Called to a house last night, RCD tripping. 16th ed board. Garage, Cooker, Sockets & Shower on RCD.
RCD holds with all MCB's on bar the sockets.
Once sockets MCB is turned on sometimes it holds for 10 mins or so then randomly trips, other times it trips straight away.
There is ring continuity (0.71,0.71,1.08) although on lifting floorboards its clear that there are several spurs from JB's on this circuit.
Insulation resistance - L-N >200, L-E >200, N-E 0.71
Based on the above I believe ghe neutral-earth low IR is causing the fault,
1st question - is 0.71 mega ohms low enough to trip RCD.
2nd question - Would a Ramp test be of any help (don't have this function
on my MFT, but could borrow one).
3rd question - if it is this N-E fault why does the MCB have to be on for it to trip?
Thanks in advance
Called to a house last night, RCD tripping. 16th ed board. Garage, Cooker, Sockets & Shower on RCD.
RCD holds with all MCB's on bar the sockets.
Once sockets MCB is turned on sometimes it holds for 10 mins or so then randomly trips, other times it trips straight away.
There is ring continuity (0.71,0.71,1.08) although on lifting floorboards its clear that there are several spurs from JB's on this circuit.
Insulation resistance - L-N >200, L-E >200, N-E 0.71
Based on the above I believe ghe neutral-earth low IR is causing the fault,
1st question - is 0.71 mega ohms low enough to trip RCD.
2nd question - Would a Ramp test be of any help (don't have this function
on my MFT, but could borrow one).
3rd question - if it is this N-E fault why does the MCB have to be on for it to trip?
Thanks in advance