ThinkGood,
that was what gave me the idea. If it's used in America, it's probably the cheapest way of doing things. (Don't get me wrong: Americans are good at finding cheap solutions)
Paul,
Why only #14 / 2.5 mm? Are you thinking about a service limited to 15A or so?
More like 1A and 2.5A services. Of course, you'd market them as 200W and 500W services. Sounds better.
David UK,
am afraid it might. But a copper conductor would be even thinner.
How do phone wires work?