On Wed, 23 Jun 2010 09:36:50 -0700 (PDT), David Robinson wrote:

Excuse my ignorance - I've never run DC cable before!

I'm installing some of these...
http://www.tlc-direct.co.uk/Products/QLCD10C.html

Various ways of grouping them are possible, using various transformers
(e.g. one 0-250W, a few 0-50W and 0-100W).

I've done some quick calcs of the required cable size, and it seems
stupidly large.

What size cable do people use in practice? How do people usually group
the lights? Big groups / small groups? Daisy chained cable or star
wired?
Also, what _type_ of cable? What core colours for after transformer?
(On site guide allows almost anything for ELV).

One transformer per light. The cost is minimal. If you group several lights
on a 'large' transformer and that goes fsulty (it does happen!) you've lost
several lights until you get a replacement.

I have severa lv lights, in the kitchen and also scattered around the
outside of the bungalow, set up in the soffits. Each one has its own
transformer, typically 50-70w for a 35 w bulb. Not had any problems at all.

--
The Wanderer

Inertia keeps me going!