is only true for a line - earth fault, with a neutral - earth fault it may trip on highest loaded MCB rather than one on faulty circuit. To test which circuit is tripping the RCD it needs one with an inbuilt RCM (residual current monitor) Eaton xPole had this see little red triangle, but a internet hunt for xPole seems to get a lot of wrong results. The one shown is only type C, RCBO 16 amp at £148 so one can see why not normally fitted in domestic. Also no SPU fitted.For RCD trip, switch off all MCBs then switch on one MCB at a time, RCD will trip on faulty MCB circuit.
I find it very difficult to work out from that photo what is going on with the neutrals.It looks like the thick Neutral is in the wrong bar.
No. RCD 2 is linked from RCD 1, fed from the main neutral bar. They feed neutral bars 1 and 2 respectively. The neutral he's talking about is the one for the B40 feed in RCD 2, which appears to be in the wrong neutral bar.I find it very difficult to work out from that photo what is going on with the neutrals.
On the face of it, it rather looks as if the RH RCD is being fed from the RH neutral bar (which makes no sense) and that it's neutral output goes to the middle bar (which also doesn't make much sense), and I can't work out where the neutral out of the LH RCD is going.
What is your interpretation of what is connected to what?
That's how it should be, but your eyesight must be better than mine, since I still can't convince myself that such is how it isNo. RCD 2 is linked from RCD 1, fed from the main neutral bar. They feed neutral bars 1 and 2 respectively.
If that fairly fat neutral connected to the right-most used terminal in the middle neutral bar is coming from that B40 circuit,then I agree it';s connected to the wrong neutral bar. However, if that CU is in service one would expect RCD trips - which, admittedly, the OP has not told us are not occurring!The neutral he's talking about is the one for the B40 feed in RCD 2, which appears to be in the wrong neutral bar.
Some people would say that, but not very usefully, since it is a 'fait accomplis' that does not have those things.If it’s a very recent install it should ideally have an SPD ... And be using RCBOs
Some people would say that, but not very usefully, since it is a 'fait accomplis' that does not have those things.
Nothing stopping you fitting split boards. Type AC RCDs is a bit **** though - 3 years old though apparently.If this was recently installed then the issue of that consumer unit is being a split RCD board.
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