When marked "CO/ALR," what type of conductors is a snap switch suitable for?

A snap switch marked "CO/ALR" indicates that it is suitable for use with copper, aluminum, and copper-clad aluminum conductors. This marking is essential as it informs the user that the switch has been tested and rated for compatibility with these specific types of conductors, ensuring safety and functionality.

When a switch is rated for copper conductors, it can handle the electrical and physical properties of copper wiring. The same applies to aluminum conductors, which have different characteristics, such as thermal expansion, compared to copper. However, the "ALR" designation specifically indicates that it can accommodate aluminum wiring, addressing concerns about corrosion and connection reliability that often accompany the use of aluminum.

Furthermore, copper-clad aluminum conductors combine the properties of both metals, enhancing conductivity while reducing weight, and the snap switch is also capable of handling these hybrid conductors without negative effects on performance or safety.

Overall, the "CO/ALR" marking on a snap switch certifies it for versatility in wiring applications, making it suitable for all three types of conductors mentioned.