Changing down csa of cable.

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Ewan Lindsay

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I have an existing 10mm T+E running from the DB1 on a 20Amp mcb to the Porch, this joins onto a 4mm SWA that runs out to supply the Garage DB2.


Is it ok for the conducter size to change down ? As the cable has adequate protection from 20A MCB at source.
 
as long as the smallest cable is protected by the fuse/MCB then its ok, you can go up and down cables sizes as many times you want,
 
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