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Pete

Ring or Radial

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With all the talk about radial circuits I was just trying remember from previous discussions that it was difficult to connect two 4mm cables in the back of a socket? 

If I use deep back boxes as suggested then is it the way forward. I have a lot of 4mm cable and would like to use this for the sockets but do it as a radial circuit instead of a ring. TIA 

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You can move a lot of juice on 4mm cable it is more than you need as 2.5mm is all you should need for a noral ring. If you have loads of 4mm why not trade it in for even more 2.5mm.

 

 

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if it's old colours you could retire! :)

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You can normally run radial finals on 2.5mm2 up to 20 A (subject to any derating that may need to be applied if the cables are running in insulation).  The limit (off the top of my head - I don't have the regs with me) is, I think, 50m2 floor area per radial final, so most houses would probably need around three or four 2.5mm2 radials, protected with 20 A (not 30 A or 32 A) MCBs or RCBOs.

 

My 24m2 floor area workshop is pretty well flooded with outlets (currently there are 18 double gang sockets in there, so 36 outlets in total........), run on two radials, wired with 2.5mm2 and each protected with a 20 A MCB. 

 

Edited by JSHarris

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