Discuss Supply to summer house. in the UK Electrical Forum area at ElectriciansForums.net
It's a TNCS system, the ZS of the circuit is 0.62 and is on a 32amp mcb
What you do in your own house is up to you, but if you sell that to a customer as an installation design then that's a different matter.
I don't see how spurring from a ring circuit to feed a summer house gives good segregation of circuits or minimises the potential disruption in the event of a fault.
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