A deep ladder cable tray measures 12″ wide and 6″ deep. It contains six 400 kcmil conductors that have a diameter of 0.925 and operate at 1200 volts. With no derating how many more 400 kcmil conductors can be added?

A deep ladder cable tray measures 12″ wide and 6″ deep. It contains six 400 kcmil conductors that have a diameter of 0.925 and operate at 1200 volts. With no derating how many more 400 kcmil conductors can be added?