The signal carried by the coaxial cable center wire actually travels along the outside of the wire, not through the inside.

When using coaxial cable for in-wall installations or outdoor applications, it’s important to check for safety ratings. Look for cables that have a CL2 or CL3 rating for in-wall use.

If you doubt that, a walk into any Home Depot electrical department, where the wire is locked up tighter than Fort Knox, will prove otherwise. Coaxial cable is a particularly expensive species ...