A switch labeled CO/ALR can be used with what type of wire?

The switch labeled CO/ALR is specifically designed for use with aluminum wire, copper wire, or copper-clad aluminum wire. CO/ALR stands for "Copper" and "Aluminum" Rated, indicating that the device can safely accommodate these types of conductors in its operation.

Using this switch allows for flexibility in wiring options, which is particularly important in various industrial and commercial settings where different types of wiring may be encountered. This capability ensures that electricians can maintain code compliance and safety standards regardless of the type of wire being used.

The other options are limited in their applicability. A switch that is labeled for "Copper only" would not be safe or effective for use with aluminum or copper-clad aluminum, as it wouldn't provide the necessary specifications for compatibility. Steel is also not a conductor typically used for electrical wiring in this context, so a switch designated for "Steel only" wouldn’t meet the requirements for typical wiring setups where aluminum and copper are involved. Lastly, a switch meant for "Aluminum only" would not be suitable for copper or copper-clad aluminum wires, limiting the versatility required in many installations.