On 26/01/2019 17:33, Chris Green wrote:
I'm running power to a shed, not a long feed from an existing CU in
the garage. It will be fed from an MCB (or RCBO) in the garage CU and
will have a small (2 circuit?) CU in the shed with one CB for power
and one for light.

So which end does one have the RCD protection?



I put mine in the head end CU so the distribution cable was protected -
then MCBs in the sub CU for outside circuits (I do not care if one
circuit blacks out all outside circuits, none are critical).

YMMV



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