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Subject: Outside lighting wiring query
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Ben Willcox wrote:
1) Run feed from existing internal lighting circuit (non-RCD protected)
2) Run new feed from CU on RCD-protected side
3) Run new feed from CU on non RCD-protected side but fit an RCBO
4) Run feed from existing internal lighting circuit and include a
separate RCD in the IP66 box
AIUI an RCD is not be mandatory, but might be a good idea? Im thinking
option 4 might be best.

3.

You do not have to use an RCBO if you cannot easily get one to fit your
CU. You could use an MCB on the non-RCD side, and then a separate RCD in
an enclosure or even a fused connection unit type RCD. I think I'd put
the RCD inside, not outside in the external box.

Have you established you have sufficient spare capacity on your lighting
circuit? Each point must be rated at 100W or actual load if greater, so
you only have a max of about 12 points on a circuit.

Also it could be very inconvenient (even dangerous) if indoor lights are
disabled by a fault on the outside installation.

Owain