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just to check. I was intending to use 2.5mm SWA. Run is 60m. Voltage drop is around 5.5 so well within the limits

no no. one 500W halogen and 3 light fittings 100W each so 800W based my calculations on 1000W to alow for one or two extra lights in the future.

I have read a few topics which have touched on this but wondering if anyone had a definate answer. I am runing SWa for 1KW of outside lights. Should I run 3 core (live, neutral and earth) or 2core and relying on armour for earth.

Yes i will be using conduit in the garage. sorry i meant using the armour as an earth for outside light fittings in the gaden?

System is TN-S. So I could use the armour right? Even if the armour has corroded slightly because it is an old run, and armour at garage end has been left exposed (for over 10 years). Another quick question with regards to the armour. For lighting purposes I assume a two core SWA can be used and...

Yes I am aware, I have already notified the LBC. I was going to install an earth rod because the supply to the garage has already been installed a few yaers back. It only has two cores, dont think the armour is good enough!? so maybe 6mm2 for the sockets and 2.5mm for the lights

Just want to clarify that what i'm doing is correct. I have a 10mm SWA cable running from the house to the garage. In the garage I have an RCD main switch, and I will install an earth rod. Just a few sockets and lights in the garage at the moment. However I now need to run cables for a garden...