What's the point in that? If the cut out has a 100A fuse why then put two in sequence? Can't see the need. I only bother using a kmf if the mains is ran in 16 te and dumb it to 80A. Plus the dno supply a dual pole isolator.

Do you do this for flat sub mains then? Can't see how the DNO would accept this.
 
Do you do this for flat sub mains then? Can't see how the DNO would accept this.

Yes when we do the meter cupboards for flats we go from our kmf to the dual pole isolator supplied by the dno. But for houses we never use this setup. We just go from consumer to dual pole isolator. I never knew to be fair, but I still can't see the need for it.
 

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Distance from red link to consumer unit
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Electrical Wiring, Theories and Regulations
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Nicholas,
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