Wire connectors labeled with only the wire size should only be used with which type of conductors?

Wire connectors labeled with only the wire size are specifically intended for use with copper conductors. This is because copper has consistent electrical and thermal properties that make it compatible with connectors that do not require additional specifications for different types of conductors.

Aluminum conductors, on the other hand, necessitate special considerations due to their different expansion rates, conductivity, and susceptibility to oxidation compared to copper. As a result, connectors for aluminum must often include specific labeling to ensure proper use and prevent issues such as overheating or connection failure.

Steel conductors are rarely used in typical electrical applications and generally are not compatible with standard wire connectors labeled only by size. Silver, while an excellent conductor, is not commonly used in standard wiring and presents similar compatibility issues as with steel and aluminum. Therefore, the designation for wire connectors labeled solely with wire size should be strictly applied to copper conductors.