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Richard3009

I have found in my house on the downstairs ring main that three lives are terminated into the 32A circuit breaker, two are for the ring main as you would expect; the third is for a socket below the fuseboard, to all intents and purposes its just a spur and electrically wise its sound.
Just wondered how this stands up with regs having three conductors in the breaker.
 
my understanding of the regs, from memory mind, is that a spur can originate from a termination at a socket outlet, a junction box or at the origin of the circuit.
 
yes, would agree with wetstring - it is acceptable to have a spur on the circuit from the consumer unit in this way.
Never done it on sockets, but it is a good way of adding an outside light on a lighting circuit if there are no spare "ways" in the consumer unit.
 
then i would see that individual socket as more of a radial being served directly from the breaker in this way and i wouldnt have a 32 amp radial on a 2.5 t/e :confused:
 
if i was designing a circuit being fed from an mcb directly to a socket irrespective of what other cables were in the mcb already i would see that circuit as a radial, not a spur.
26a cable and 32a breaker :confused:.
i see where your coming from spurring from existing socket etc etc but not from board.
just my opinion ;)
 
the regs permit it, any spur is a single 2.5mm cable protected with 32A breaker
 
Last edited by a moderator:
its not a radial, you can't have more than one double 13A on it, a radial you can providing the conductor size is correct for the potential load.
 
didnt mean you tiger, was asking richard. ;)

dont forget Ib has to be equal to or greater than In when selecting a cable richard.

point me to the correct reg and i will stand corrected :confused:
 
If there was a radial circuit from a 20A MCB then thats fine

If there was a "spur" from a 32A RFC MCB then that is also fine.

It is no different at all to taking a spur off the back of a socket or at any point in the ring via jb.

Pg 362/3
 
the spur should only feed one outletunless fed through 13afcu so max current via 13amp plugs, 26amps.
 

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