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Doomed

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For the feed into a metal consumer unit it is good practice to have the earth / CPC using the same hole as its corresponding tails, yours appears not to be.
 

Taylortwocities

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Can you post a photo of the new wiring layout of the consumer unit. In your original pic, you have two neutral cables in the top of the left hand RCD.
You should never have two, the place to join the neutrals is in the appropriate neutral bus bar.
MK usually provide a layout fish ram for you to follow.
 

nicebutdim

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Can you post a photo of the new wiring layout of the consumer unit. In your original pic, you have two neutral cables in the top of the left hand RCD.
You should never have two, the place to join the neutrals is in the appropriate neutral bus bar.
MK usually provide a layout fish ram for you to follow.

I'd wondered about those neutral cables, but wasn't sure what was right or wrong. A Google image search showed several MK Sentry dual RCD boards set up exactly the same, so I'm guessing the neutrals are probably welded(?) together.
 

pc1966

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If you add a "fake earth" terminal to the supply neutral of your test rig, rather like a PME earth coming off the DNO cut-out neutral, then you can use that only for your MFT's earth when doing RCD testing. That way you can trip the RCDs in your example CU without tripping the RCD plug supplying the system.
 

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