Clarification on additional sockets on a spur

[JohnS888]

Evening all

Got a query excuse me if not seeing the simple logic. On reading regs book it states can install one unfused spur off ring in 2.5 but if more sockets required need to first wire through a fused spur. My question is, is this all because of possibility of overloading one leg of the ring or is it to protect the first cable coming off the ring? If this is the case can any justification be made if ran a 4mm off the ring to first socket and then a 4mm to second. Thanks

 

[Pretty Mouth]

Can you clarify that for me. Seem to suggest even with one double socket being supplied from another double on a ring could be 52 amps on one leg of the ring?

At the terminals of the double socket spurred from, there could theoretically be 52A (26A from the spur, 26A from the spurred-from), but this would be divided up between the 2 legs of the ring, with more of it going down the shorter leg. While this overload is taking place, the circuit breaker is working toward disconnection, could take up to 10 mins for a 32A 60898. So if the spur was taken from a socket very close to the CU on a very long ring, then a cable rated to perhaps just 20A could indeed be getting the majority of that 52A for 10 minutes.

Highly unlikely though, and to design a circuit like this would be breaking 433.1.204