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Ring joined up to a Radial

Former Community Member
Former Community Member
Hi all, first post here so please be nice :-)


I am having my house rewired and have taken it all back to brick with the exception of the kitchen which I can not afford to renovate yet but will be in the next couple of years.  The kitchen is on ring circuit in 2.5mm.  I have asked for the whole house to be rewired in radials, with each room on its own circuit, however do not want to mess with the kitchen until I am ready to renovate it in a few years but would like the kitchen to be on a radial.  My electrician has advised that he run a 4mm cable to the kitchen through the ceilings etc and join it to the 2.5mm ring already in place and put it on a 32amp breaker.  This doesn't sound conventional and frankly i am not sure if what he is doing is right.  Any advice please before I raise my concerns with him.  In the future I can then join onto the 4mm cable and turn the kitchen into a radial on a 32amp breaker wired in 4mm cable.


If there is nothing wrong with what he is doing, then for my own peace of mind how should the 4mm cable be connected to the 2.5mm ring.  Can a direct connection be made in a junction box or does it need to be connected via a fused connection unit.


I know he is an electrician but he is young and I assume new to it and therefore I just need to be sure for my own sanity that what he is doing is right.
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  • 0
    Zoomup:

    With 2.5/1.5mm2 6242Y cable wired as a ring there are two C.P.C.s at each accessory on the ring, excepting spurs.  When connecting a ring final circuit to a 4.0/1.5mm2  6242Y cable there is only one 1.5mm2 C.P.C.


    Has this ever concerned anyone? Are there any potential problems?


    Z.


     


    Can't be worse than the single 1.5mm² c.p.c. on a complete 4mm²/32A radial - which is deemed acceptable (high protective conductor currents notwithstanding).


       - Andy.


Reply
  • 0
    Zoomup:

    With 2.5/1.5mm2 6242Y cable wired as a ring there are two C.P.C.s at each accessory on the ring, excepting spurs.  When connecting a ring final circuit to a 4.0/1.5mm2  6242Y cable there is only one 1.5mm2 C.P.C.


    Has this ever concerned anyone? Are there any potential problems?


    Z.


     


    Can't be worse than the single 1.5mm² c.p.c. on a complete 4mm²/32A radial - which is deemed acceptable (high protective conductor currents notwithstanding).


       - Andy.


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