> 2 mile long christmas lights

The closest I have comes was custom stage lighting where 2 miles of cable
looks small. But none of it was low voltage ...

I'd go with a normal voltage supply (ac 220V or whatever you have), with
PSUs spread along the way to feed a segment each, of, as big as you dare
(but less than 100 feet each probably). You may have to use several feed
points for mains (how much power do you plan to put into it ?! - more than
about 5kW mandates several feedpoints).

Signalling would be Manchester or carrier current WITH TRANSFORMER
INSULATION at each station. The ground loops formed over such a distance
are truly amazing even if nothing goes wrong.

hope this helps,

Peter

PS: I do not normally shout, but take the transformer insulated signalling
very seriously. All the shortcuts tried to remove that resulted in
spectacular failures in my experience.

PS2: I do not know what the longest X-mas light is but I suspect that it
may be longer than 2 miles.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads