Why are my lights tripping?

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Why is the there a line of LIM on the L/N column?
Surely this is unacceptable on a c/u change?
 
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Why is the there a line of LIM on the L/N column?
Surely this is unacceptable on a c/u change?
Depends on the circuits.

For lighting circuits, if there are downlights or other fittings with 12v transformers, electronic ballasts or similar, it would be unreasonable to test LN, as this would involve dismantling most of the circuit first.

For socket circuits where items could easily be unplugged or FCUs switched off, there is no reason not to.

For the cooker circuit and the kitchen circuit which only supplies 1 outlet - presumably they couldn't be bothered.
 
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Nor could they be bothered to disconnect neutrals before IR testing to earth. And, efli results don't matter as its on a 30ma rcd which in theory would allow up to 1667 ohms.
 
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An RCD is not medicine for a poorly EFLI.

On a TT system there's little you can do about it, but on a TN one you do not let a high reading go by, saying "oh well, there's an RCD...."
 
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If the inrush is still a nuisance last resort is you can put the lights via a FCU mounted next to the dist board fitted with a 5 amp catrtridge fuse,
This Fcu could be supplied by a larger cable and thus a larger mcb like a 20 amp, the cartridge fuse can handle even higher inrush.

And i assume thats why

Are Hager BS1361 cartridge fuse modules still available? Replacing the offending breaker(s) with those might be a neater solution.
 

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