What does the description "10 - 19 SD CU THHN-THWN 2" indicate about the conductor?

The description "10 - 19 SD CU THHN-THWN 2" indicates that the conductor is made of solid copper (CU) and is stranded, which is supported by the "19" in the description. This specifically identifies a conductor with a gauge of 10 AWG and 19 strands. The "SD" denotes that it is stranded, while "THHN" and "THWN" refer to the insulation types that are heat and water resistant, respectively. The presence of both THHN and THWN indicates the versatility of the conductor to be used in various environments.

This makes the identification of the conductor as a 10 AWG, 19-stranded copper THHN-THWN clear, confirming option B as the correct answer. The other choices do not accurately capture both the gauge and composition of the conductor described.