“Six THHN wires: three #8 AWG and three #6 AWG. Need them in a single conduit, underground from the panel to the new HVAC unit. Tell me the smallest size EMT you can use. Don’t guess. Calculate it.”
[ \textMin conduit area = \frac0.26190.40 = 0.65475 \text sq in ] how to calculate conduit size for cables
Mike grinned. “Why not 3/4 inch? It’s cheaper.” “Six THHN wires: three #8 AWG and three #6 AWG
[ \textMin conduit area = \frac\textTotal wire area0.40 ] how to calculate conduit size for cables