On Mon, 14 May 2007 19:27:15 GMT, "Tom Horne, Electrician"
wrote:


There are no missing knockouts in the box. It looks like a circuit
that has never been used. It could be that or they removed something
and put a box on the end.

There are several reasons to mark a white wire in a building wiring
system. One of those reasons is that the building has two or more
different voltage systems. Since you've already said that this cable
comes from a lighting panel there is a definite possibility that the
cable carries 480/277 volt power.

That means when the OP hooks up the vacuum, it will really suck.
--
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison