Plating the shield walls and helix with high conductivity materials increases the Q beyond that of bare copper.

The tin/lead becomes the resist leaving the bare copper to be etched away.

Treatments, such as benzimidazolethiol, prevent surface oxidation of bare copper.

The places to which components will be mounted are typically plated, because untreated bare copper oxidizes quickly, and therefore is not readily solderable.

This center metallic disc can be solder-coated, gold-plated or otherwise treated, although bare copper is most common as it is not a current-carrying contact.

The original electric distribution lines in Appleton were made of bare copper.

For three-way switches, it must have three conductor wires - black, white and red - plus a ground wire, which is usually bare copper.

Distribution wires were bare copper, with light amounts of cotton used to insulate it.

All green-insulated ground wires (or bare copper ground wires) must be twisted together and capped with a wire nut.