single 2.5mm wire in a 32A MCB - take2

[Sparks]

Okay, I posted before under this topic, as I found a single 2.5mm wire in a

32A MCB in the CU at work.

I have now found out this is for one double RCD socket for the sump pump in the basement. I assume this is OK, as it both of the sockets are occupied by the sump pumps (One is a 240v pump, the other is a secondary 12v pump's battery charger.

I need a spare way on the CU as we are having some air-con installed, can I simply move this to the basement ring (32A) MCB, so it is just a spur? Or does it need to come from behind a socket on the ring to be compliant?

Thanks!

Sparks..

[ARWadsworth]

Straight from the CU is usually fine for an unfused spur. The rule of no more spurs than points on the ring apply so if you already have a spur from every socket on the ring already (it can happen) then you could not add another spur.

OSG says something like -Unfused spurs can be added to the terminals of a socket on the ring, a junction box or at the origin of the circuit in the CU

Adam