Wire type THWN copper is run in a raceway from a wall outlet in a building under concrete floor where the conduit is in contact with the earth. The walls are exposed on both sides to free air. If the load requires a minimum wire rating of 75 A, the minimum wire size permitted is ____ AWG.
A) 4
B) 6
C) 8
D) 10

Question

Quizplus · Accepted Answer

For a load requiring a minimum wire rating of 75 A, THWN copper wire with a size of 4 AWG is appropriate according to the National Electrical Code (NEC) tables for wire ampacity. This size ensures the wire can safely handle the electrical load without overheating.

Wire Type THWN Copper Is Run in a Raceway from a Wall