12V garden lighting - preparation work

6 Jun 2007
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United Kingdom
Hello. I'd appreciate a bit of advice please.

I'm currently building an extension and landscaping the garden. Eventually, I'd like to put 12V lighting in the garden. I intend to have a competant electrician to carry out all the electrical work but that will be 6 months or more away and I'm now at the stage where I want to build over the areas where the cable runs will be. Ideally I'd like to bury the cables now.

The intention is to have 2 x 12V lighting circuits, one at the front and one at the back with lights at 4/5 positions in each circuit. The overall length of each circuit from the CU will be about 30M (assuming they are radial circuits). I can't actually specify the loading at this point but it will only be LCD type lighting, no power take offs.

With these distances, is it feasible to locate the LV lighting transformers indoors near to the CU or will I need to use 240V to each lighting position?
Depending on the answer, what size and type of cable should I be burying.

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i take it you mean LED not LCD?

where the supplies go really depends on what type lf lights you buy. That said MOST will only require say 12v at each light. The ony cable you can really bury is SWA which is overkill for led lifghts. I would suggest you run 20mm black conduit with T boxes at each point you wan a light. the cable can then be installed later.

There are also "kits" that come with cable that is meant to be buried. it should be noted though it has no mechanical protection
Voltage drop might be a problem. Use mains voltage. You can get LED mains voltage lights. If you go with breezer's suggestion, the conduit must be fixed to something solid
I would suggest burying 3 or 4 inch downpipe on your cable runs so you can replace cable when (not if) it goes wrong and lay 2 or 3 lengths of string through to pull your cable
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