Joe Lee wrote:

Ignore this bit, it is unneccesary and adds to the nuisance tripping.


Wrong. also please explain how it adds to nuisance tripping.

Good advice I thought. "Wrong" seems rather too strong even if the
argument were balanced with pro's and con's

If you add a circuit (any circuit for that matter) to the RCD protected
side of your house CU, then you are by definition adding a new source of
earth leakage that can eat into your total combined "budget" of 30mA
allowed by the RCD. Even perfectly wired circuits may have some small
leakage due to inductive or capacitive coupling in either the circuit
itself, or more likely, the appliances used on them. Electrical
instalations sited in outbuildings are also more likely to experience
dampness from time to time which will also raise the likelihood of them
generating a leakage related trip. Every trip of this type is going to
take out all the RCD protected circuits on your split load CU - sounds
like a nuisance to me.

Since there is very little likelihood that you will be accidentally
chopping through your SWA cable with the hedge trimmers, there is no
great need for it to be RCD protected.


--
Cheers,

John.

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