I'm trying to build a built-in computer cabinet. I want to route the surge protector cord and cables through the cabinet floor to the front of the 2x6 base. The electrical outlet is on the adjacent wall about 6 ft away. Is there a hose or anything on the market to pass the cables through the dead space under the cabinet? Maybe to attach to a desk grommet?
As batsplatsterson indicated there are products made specifically for networking cables. I'm familiar rigid and flexible blue ones - the rigid ones have special connectors.
If you run the lines through plastic cable, however, I would separate the computer, TV & TV audio cabling from the electrical cables. You should not mix powered wiring with non-powered or low voltage wiring to prevent an electrical shock or worse.
You could use some flexible nonmetallic conduit in there - you won't be using it as an actual conduit, just as a sleeve to route the cable. The one in the picture is Carlon Resi-guard but there are many other brands.
It's sold in home improvement stores along with straps, fittings, boxes, etc. to make a nice install.
You're in a gray area with the electrical code, depending on whether this cabinet is a piece of furniture or a fixed part of the building. Running flexible cords through the walls, floors, ceilings etc. is not permitted. But it's certainly safer in a sleeve that prevents the cord from getting pinched or damaged.