Simple Hollow Porcelain Bushings: These bushings are insulated by an air space between the conductor and the porcelain and are used primarily on small generating units. Many date back 40 to 60 years.

When electromagnetic radiation or static electricity is applied to a hollow conductor, it is transmitted over the surface of the conductor—preventing it from passing through the conductor's ...

This phenomenon, known as skin effect, reduces the effective cross-section of a conductor, and is a reason for using hollow conductors for some high-ampacity bus work. It's more pronounced at higher ...

A simple antenna transmits electromagnetic waves into the cylinder barrel, which acts as a hollow conductor. The piston reflects the waves, and the same antenna receives the reflected signal.