Again, a very informative thread.

One thing which hasn't been mentioned, is the importance of
strain-relieves. When using a twist-lock plug, the amount of pull on a
'tripped-over' wire can be enough to break away the stranded wires from
the attachment screws. Make sure that the strain relief is suited for
size of the wire chosen.
Sometimes people think they need to go to heavier gauge wire when the
voltage doubles, while in fact the opposite is true.

my 2 cents worth ($33.00 Canadian)