Some advice ahead of running wiring to shed

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John. thanks. It would suggest that the smallest size if just the armouring is used would be around 6mm2. though I suppose if a 3 core was used 4mm2 could be used if core 3 and the swa were in parallel.
You're welcome. Per quick 'back of a fag packet calcs (hope they're right!), for the purpose of the adiabatic equation in BS7671:
  • 4mm² 2-core SWA Armour CSA=21mm² Cu equivalent=9.3mm²
    6mm² 2-core SWA Armour CSA=24mm² Cu equivalent=10.6mm²
    10mm² 2-core SWA Armour CSA=41mm² Cu equivalent=18.2mm²
    16mm² 2-core SWA Armour CSA=46mm² Cu equivalent=20.4mm²
Kind Regards, John.
 
So as a 2 core 6mm2, (with a 3 core 4mm2 as a possibility).
Looking at various threads from a load, voltage drop and impedance point of view 2c 6mm2 fits the bill in most cases!
 
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So as a 2 core 6mm2, (with a 3 core 4mm2 as a possibility).
Looking at various threads from a load, voltage drop and impedance point of view 2c 6mm2 fits the bill in most cases!
Yes, probably- the deciding factor being the voltage drop which, in turn, would depend upon the design load.

Quick calcs suggest that with 6mm² 2-core SWA, for a 13A load, you'd have about 72 metres to play with before hitting the 3% limit for lighting vd. At 26A, that would obviously halve to 36 metres. If you went to 3-core 4mm² SWA, the CPC (core+armour) would be OK, but the voltage drop (for lighting) would limit you to appreciably shorter distances.

Kind Regards, John
 

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