Using PaintEffects for Wires/cables in Maya-
http://vimeo.com/28203992
I start by using the Paint Effects -Gold Brush. Then draw the wire/cable shapes.
Global Scale = width.
Sample Density = faceting.
Display Qualty = sides around.
display quality does not convert to polygons(?)
Shelf script: Convert to polygon,quadrangulate(optional)
you can still manipulate the sample density if you want.
Then assign new shader.