Which description fits a conductor labeled as 10-19 SD CU THHN-THWN 2?

The designation "10-19 SD CU THHN-THWN 2" provides specific information about the conductor. The "SD" indicates that it is a stranded conductor made from soft copper. "10" refers to the gauge size of the wire, which means it is a 10 AWG conductor. The "19" indicates the number of strands in the conductor—here, it tells us that the conductor contains 19 strands.

Thus, the correct interpretation is that it is a 10 AWG conductor with 19 strands of soft copper. The "THHN-THWN 2" specifies the insulation type and its suitability for various applications, but it does not affect the strand count or material characteristics.

In this way, the answer accurately reflects the combination of gauge size, number of strands, and material type indicated in the conductor's labeling. The other choices misinterpret either the gauge size, number of strands, or the type of copper, leading to incorrect specifications.