On Fri, 11 Jan 2013 22:01:31 +0000 (UTC), Red Green
wrote:

wrote in
:

On Fri, 11 Jan 2013 12:48:46 -0800 (PST), gary
wrote:

I need electricity for a ceiling fan. In my attic, I found an
existing wire that powers a light switch. I want to run a new wire
from the existing wire to the ceiling fan. How do I tap into the
existing wire?
With an accessible junction box. Best bet is likely to run new wire
from the light switch. (unswitched)

And what will you connect the "new wire" white wire to on that switch??????
Depends if it line switched or drop switched. Drop switched won't
work